JP4898153B2 - History display device for hanging clamp - Google Patents

Description

  The present invention relates to a history display device that displays the number of operations (number of times of use) of a hanging clamp.

  Various suspension clamps used to lift workpieces such as steel plates and shaped steels have a boosting action by the link mechanism and a tightening force through the cam mechanism as the suspension load (load) of the workpiece gripped by the cam and swivel jaw increases. It has a structure that increases automatically and the cam bites into the workpiece. For this reason, in order to ensure safety work, maintenance and inspection and replacement of parts when worn are very important. In particular, the cam and the swivel jaw, which are the main parts for gripping the workpiece, need to be replaced in about 3 to 6 months depending on the frequency of use.

Such a problem is basically common to all types of cargo handling devices as well as suspension clamps. For example, a history display device as means for solving this problem for an electric chain block is disclosed in Patent Document 1 below. Yes. The history display device is configured to measure and cumulatively store the total number of operations and the total operation time in which the electric chain block has actually operated, and to read and display it by a required operation. According to this, it is possible to accurately predict the lifespan and replacement time of the component parts through the operation history of the electric chain block, and it is possible to perform maintenance inspection and component replacement at an appropriate time.
JP-A-11-106188

  Therefore, it is conceivable to apply a history display device such as that described in Patent Document 1 to a hanging clamp, but unlike an electric chain block in which simple hoisting and lowering operations are repeated, the hoisting clamp links the cam when lifting. Because of the complicated movement through the mechanism, the same configuration cannot be applied to the suspension clamp as it is. Further, in the above-mentioned Patent Document 1, the ON signal of the winding operation button switch is counted, and the count number is accumulated and stored as the number of operations. However, such an operation electric signal is used in the hanging clamp. Therefore, the number of movements must be counted using a sensor that detects the physical movement of components during the lifting operation, and it is installed between a pair of side plates of a suspension clamp where a large number of moving parts are arranged. Miniaturization is an essential requirement.

  Under these circumstances, the history display device for the hanging clamp has not been put into practical use, and there are continual deaths due to the falling of the workpiece caused by missing the parts replacement time.

  That is, an object of the present invention is to provide a history display device having a new and small configuration capable of accurately displaying the number of times of operation of the hanging clamp.

In order to solve this problem, the present invention according to claim 1 is capable of projecting to a clamp body provided with a workpiece insertion port, a swiveling jaw that projects from one side of the workpiece insertion port, and the other side of the workpiece insertion port. In the suspension clamp, the link arm includes a suspension cam, a suspension ring, and a link arm that connects the suspension ring and the cam so that the cam protrudes into the workpiece insertion port when the suspension ring is raised relative to the clamp body. A detecting means for detecting that the suspension clamp has moved from a position in the unloaded state to a position in the loaded state, a storage means for storing the number of operations of the clamp, and a time when the detecting means detects the movement of the link arm. Counter means for updating and storing the number of clamp operations stored in the storage means by +1, and display means for displaying the cumulative number of clamp operations stored in the storage means To become a a history display apparatus of the hanging clamp and said.

In order to solve the same problem, the present invention according to claim 2 includes a clamp body provided with a work insertion port, a suspension ring, and one side of the work insertion port when the suspension ring is raised relative to the clamp body. In a suspension clamp having a presser foot provided so as to protrude from the side, a crank cam, and a wedge provided so as to protrude from the other side to the workpiece insertion port when the crank cam is rotated by a handle operation, Detecting means for detecting that the suspension clamp has been rotated from the unloaded position to the loaded position, storage means for storing the number of clamp operations, and detecting means for detecting rotational movement of the crank cam Counter means for updating the number of clamping operations stored in the storage means by one each time, and cumulative clamp stored in the storage means Display means for displaying a work number, a history display apparatus of the hanging clamp characterized by comprising a.

According to a third aspect of the present invention, there is provided the suspension clamp history display device according to the first or second aspect, wherein the detecting means is in a state in which the link arm or the crank cam located in a separated position in the unloaded state of the suspension clamp is in a loaded state It is detected that the link arm or the crank cam in the close position is separated when the suspension clamp is in a no load state when the suspension clamp is unloaded. characterized in that there.

According to a fourth aspect of the present invention, in the suspension clamp history display device according to the first or second aspect , the detecting means detects the approach or withdrawal of the link arm or the crank cam, which is a metal body, by a change in magnetic flux density. Then, it is characterized by comprising a non-contact type metal sensor which converts this into a voltage and outputs it.

According to a fifth aspect of the present invention, in the suspension clamp history display device according to the first or second aspect , the storage means stores a cumulative count recording section for storing the total cumulative clamp operation count, and a monthly clamp operation count. The control means is stored in the cumulative count recording section and the monthly count recording section for the month each time the detecting means detects the movement of the link arm or the crank cam. The number of times of the clamping operation is incremented by 1 and stored .

The present invention according to claim 6 is the suspension clamp history display device according to claim 1 or 2, wherein the control means is updated when the detection means detects the movement of the link arm or the crank cam. The display means is controlled so that the cumulative clamp operation count is automatically displayed on the display means, and the cumulative clamp operation count stored in the storage means is displayed on the display means as needed by a switch operation.

According to the history display device of the present invention, the workpiece inserted into the workpiece insertion port of the clamp body is positioned between the first holding member protruding to one side of the workpiece insertion port and the second holding member protruding to the other side. Each time the detecting means detects that the link arm or the crank cam is moved from the unloaded position to the loaded position in the hanging clamp configured to be gripped and lifted by Since the number of clamp operations stored in the storage means is incremented by 1 and stored, and this is displayed on the display means, the operator can accurately grasp the number of operations of the hanging clamp. Therefore, it is possible to accurately predict the service life and replacement period of components that are easily worn, such as swing jaws, cams, pressers, wedges, etc., and perform maintenance inspections and component replacements at appropriate times. As a result, it is possible to prevent a work drop accident caused by missed parts replacement time.

In addition, by using a non-contact type metal sensor that detects the approach or withdrawal of the link arm or crank cam , which is a metal body, by changing the magnetic flux density, and converts the voltage into a voltage and outputs it, The transition from the no-load state to the load state can be accurately detected without hindering the movement of the link arm or the crank cam , and hence the operation as the suspension clamp.

Further, the storage means is provided with a cumulative count recording section for storing the total cumulative number of clamping operations and a plurality of monthly count recording sections for storing the number of monthly clamping operations, and the detection means moves the link arm or the crank cam . Each time it is detected, it is configured to update and store the number of clamp operations stored in the cumulative count recording unit and the monthly count recording unit of the month by +1, so that not only the total cumulative clamp operation number but also the monthly The cumulative number of clamp operations can be stored and displayed. The swivel jaws, cams, pressers, wedges, etc., which are the main parts that grab the workpiece, need to be replaced in a few months. Can contribute more by work.

  FIG. 1 shows a vertical suspension clamp 10 that clamps a vertical surface portion of a workpiece such as a flat steel plate or a die steel from both sides thereof. The clamp 10 is provided with a pair of clamp bodies 11, 11 each having a substantially inverted U-shaped opening 14 between leg portions 12 and 13 extending downward, and spaced apart by a spacer member 15. Reinforcing plates 16 and 16 are fixed by welding to the outer surfaces of 11 and 11, respectively. Below these reinforcing plates 16, 16 are formed substantially identical openings 17, 17 having a slightly larger width than the openings 14 formed below the main bodies 11, 11. The lower end of the spacer member 15 slightly protrudes from the leg portion 11 into openings 14 and 17 (hereinafter, these openings are collectively referred to as a work insertion opening 18), and this protruding surface cooperates with a cam 20 described later. Thus, a swivel jaw 19 for sandwiching and lifting the work W is rotatably attached.

  Longitudinal grooves 21 extending in the vertical direction are formed in the upper portions of the inner surfaces of the main bodies 11, 11, and a hanging ring pin 22 is bridged between these longitudinal grooves so as to be vertically movable. The suspension ring pin 22 penetrates the lower end portion of the known suspension ring 23 and also penetrates the upper end portions of the pair of link arms 24 and 24 arranged on both sides of the suspension ring 23 between the main bodies 11 and 11. That is, the suspension ring 23 and the link arm 24 are rotatably connected to each other by the suspension ring pin 22, and the link arm 24 is also moved when the suspension ring pin 22 moves up and down in the vertical groove 21 in accordance with the lifting / lowering operation via the suspension ring 23. Moving. FIG. 1 shows a state in which the hanging ring pin 22 is at a lower position in the vertical groove 21.

  In the main body 11, a cam pin 25 is horizontally fixed to a lower portion of the work insertion opening 18 (in FIG. 1), and a cam 20 that is rotatable about the cam pin 25 is provided. The cam 20 is rotatably connected to the link arm 24 via a link pin 26. With the connection configuration by the link pin 26, the cam 20 rotates around the cam pin 25 as the link arm 24 moves. The rotation position of the cam 20 when the hanging ring pin 22 is at the lower position in the vertical groove 21 is as shown in FIG. 1, and at this time, the cam 20 does not substantially protrude toward the workpiece insertion port 18. Is housed inside. That is, at this time, the clamp 10 is in an open state or an unloaded state.

  The clamp 10 is provided with a latch-type locking device 27, and a lock spring 29 that is spanned between a cam 20 and a lock arm 28 that is rotatably connected to the main body 11 about a shaft 31. The initial tightening force is applied to the workpiece W in a state where the mass of the workpiece W is not acting on the clamp 10 by using the spring force of. In FIG. 1, the tension of the lock spring 29 is not applied, and the lock is released. After the workpiece W is inserted into the workpiece insertion port 18, the lock arm 28 is lifted through the operation ring 30 and rotated clockwise in the drawing around the shaft 31, so that the tension of the lock spring 29 is increased. The cam 20 is transmitted to the cam 20 and rotated in the clockwise direction in the drawing with the cam pin 25 as an axis, and an initial tightening force is applied to the workpiece W to clamp the workpiece W against the swiveling jaw 19.

  Each time the clamp 10 shifts from the no-load state (FIG. 1) to the load state (FIG. 2), the link arm 24 moves upward. By detecting and counting the movement of the link arm 24, the clamp 10 The number of operations can be grasped. Therefore, in this embodiment, a history display device 32 including a sensor for detecting the movement of the link arm 24 is incorporated in the clamp 10.

  As shown in FIG. 3, the history display device 32 includes a non-contact metal sensor 33, an A / D converter 34, a central processing unit (CPU) 35, and an LCD 36 having a 6-digit digital display unit, for example. The operation switches 37 and 38, a battery 39 made of, for example, a button-type lithium battery, a memory (ROM) 40, and a calendar 41 are included. All the components of the history display device 32 are accommodated in the casing 42 and fixed between the pair of main bodies 11 and 11 of the clamp 10 using a silicon adhesive seal material or the like. The ROM 40 includes one cumulative count storage unit 400 and, for example, twelve monthly count storage units 401 (FIG. 4).

  The non-contact type metal sensor 33 is located away from the link arm 24 when the clamp 10 is in an unloaded state (FIG. 1), but the link arm 24 when the clamp 10 is in a loaded state (FIG. 2). It is provided immediately below, and detects the approach of the link arm 24, which is a metal body (the clamp has shifted to the load state), by changing the magnetic flux density, and converts this into a voltage and outputs it. That is, when the magnetic field generated around the coil connected to the oscillation circuit of the sensor 33 is blocked by the metal (link arm 24), the inductance amount of the coil changes, and as a result, the oscillation amplitude of the oscillation circuit changes. (Decrease) (see FIG. 5). Thus, it is detected that the link arm 24 has moved from the position when the clamp is unloaded (FIG. 1) to the position when the clamp is loaded (FIG. 2), in other words, the clamp 10 is being used.

  The A / D converter 34 digitally converts the output amplitude value from the metal sensor 33 and inputs it to the CPU 35. As a characteristic of the A / D converter, even if the input value (the output value of the metal sensor 33) is constant, the output value slightly fluctuates. In order to remove this fluctuation, the CPU 35 performs the past n times in a predetermined cycle. It is preferable to sample the output of the A / D converter and take the average value.

  The CPU 35 analyzes the input value V (the value obtained by digitizing the output value from the metal sensor 33 by the A / D converter 34 and averaging it in the sampling process, the same applies hereinafter), so that the link arm 24 is in the clamp load state. It is determined that it has moved to the current position (FIG. 2). Specifically, when the input value V rises above a certain value (ΔV) within a certain time (ΔT), it is determined that the link arm 24 has shifted to a load state and has undergone a clamping operation. To do. This is because the input value V is a large value when the metal approaches by the metal detection by the metal sensor 33 and a small value when the metal is separated, but the output of the metal sensor 33 is affected by the outside air temperature, and is relatively low when the outside air temperature is high. Since the output value is relatively high when the output temperature is low or the outside air temperature is low, the clamp state changes only when the input value changes at a certain slope or more in order to eliminate the influence of the outside air temperature. It is determined that For example, in the case where the input value V changes as shown in FIG. 6, it is determined that the clamp state change has occurred when ΔV equal to or greater than two vertical graduations between ΔT = horizontal three graduations. In this case, since the slope of section A has not reached a certain level or more, it is judged that the temperature is affected by a temperature change (temperature drop), and section B shows a slope of more than a certain level. Since C section does not reach a certain slope or more, it is judged as an influence due to temperature change (temperature rise), and D section shows a slope exceeding a certain degree, so it is judged that the metal has separated at this point. To do. In this embodiment, since the clamp load state is determined by detecting that the link arm 24 is approaching, when there is a ΔV (increase) of a certain slope or more as seen in the B section, the clamp load state As described later, the total cumulative count number and the monthly cumulative count number are incremented by one as described later.

  Hereinafter, the usage and operation of the history display device 32 will be described. When the battery 39 is inserted and necessary initial operations (counter clear, calendar setting, etc.) are performed, the history display device 32 is put into a stand-by operation.

  As described above, when the CPU 35 determines that the link arm 24 is approaching, that is, the clamp 10 has shifted from the unloaded state (FIG. 1) to the loaded state (FIG. 2), in other words, the clamp 10 is being used. The CPU 35 reads the count number Nt stored in the cumulative count storage unit 400 of the ROM 40, adds 1 to this, and updates and stores it as the total cumulative count number “Nt + 1” after addition in the cumulative count storage unit 400. . At the same time, the CPU reads the monthly cumulative count number Nm stored in the monthly count storage unit 401 (401-1) of the ROM 40, adds 1 to this, and adds the monthly count number to the monthly count storage unit 401-1. It is updated and stored as the cumulative count “Nm + 1”. Further, the total cumulative count number “Nt + 1” after addition and the monthly cumulative count number “Nm + 1” are displayed on the LCD 36. Although the specific display form is arbitrary, for example, after displaying the total cumulative count “Nt + 1” for a predetermined time (for example, 15 seconds) and then displaying the monthly cumulative count “Nm + 1” for a predetermined time (for example, 15 seconds) Make the display disappear.

  The above processing is performed every time a clamping operation is detected. For the processing of the monthly count number, refer to the calendar 41, and when the month is changed and the first clamping operation is detected, the count number “1” is stored in another monthly count storage unit 401 (401-2), Thereafter, each time a clamp operation is detected within the same month, update storage of the total cumulative count storage unit 400 and update storage of the monthly count storage unit 401-2 are performed in the same manner as described above, and these are displayed on the LCD 36. Process. When entering the 13th month after the start of the history display device 32, the count of the monthly count storage unit that has stored the number of times of clamping operation of the oldest month (12 months ago) is reset, and the monthly count storage unit is Used as a clamping operation frequency storage section at the 13th month. Hereinafter, by sequentially resetting the oldest monthly count storage unit and using it as the latest monthly count storage unit, the monthly count storage unit 401 of the ROM 40 stores the number of clamping operations for a total of 12 months from the current month to 11 months ago. It is memorized every time.

  The current total cumulative count number stored in the cumulative count storage unit 400 and the monthly cumulative count number stored in the monthly count storage unit 401 (401-1 to 401-12) detect the clamping operation. In addition to being displayed on the LCD 36 each time, it can be read out and displayed on the LCD 36 at any time by operating the switches 37 and 38. As an example, every time the switch 35 is pressed, the CPU 35 counts the total cumulative count → the monthly cumulative count for the current month → the monthly cumulative count for the 11th month → the monthly cumulative count for the 10th month →→→ 2 months before Monthly cumulative count → Monthly cumulative count for the previous month → Total cumulative count → The display changes as follows: Every time switch 38 is pressed, the total cumulative count → Monthly cumulative count for the current month → 1 month ago Monthly cumulative count of 2 months → Monthly cumulative count of 2 months ago →… → Monthly cumulative count of 10 months ago → Monthly cumulative count of 11 months ago → Total cumulative count → → The display of the LCD 36 is controlled to be switched.

  In addition, the clamp body 11 is provided with a display window (no reference) corresponding to the position of the LCD 36 so that the operator of the clamp 10 can easily confirm the display on the LCD 36. The operation switches 37 and 38 can also be easily operated from the outside of the clamp body 11.

  FIG. 7 shows a vertically suspended intact clamp 50 that clamps a vertical surface portion of a flat steel plate or die steel workpiece from both sides. The clamp 50 is provided with a pair of clamp bodies 51, 51 each having a slot-like work insertion port 54 between leg portions 52 and 53 extending downward, respectively, at a predetermined interval. Between the clamp bodies 51, 51, a suspension ring 55, an L link 56, a presser link 57, a stopper cam 58, a stopper cam guide 59, a presser foot 60, a crank cam 61, a spring rod 62, a wedge 63, a wedge pushing spring guide 64. A rack plate 65 and the like are provided.

  The L link 56 is connected to the lower end of the suspension ring 55 by a suspension ring pin 66, and rotates around a bolt 67 spanned between the main bodies 51, 51 in accordance with a lifting / lowering operation performed through the suspension ring 55. To do. The L link 56 is connected to the pressing link 57 via a pin 69 that can move in a long hole 68 formed at the upper end of the pressing link 57. The holding link 57 is rotatable around a cam pin 70 that spans between the main bodies 51 and 51 in the leg portion 52. A presser foot 60 is pivotally supported on the presser link 57 by a pin 71. When the suspension ring 55 rises relative to the main body 51 from the state of FIG. 7 through the above-described connection configuration, the L link 56 rotates clockwise around the bolt 67 (the same applies to FIGS. 7 and 8 below). The presser link 57 rotates slightly around the cam pin 70 in a counterclockwise direction. Accordingly, the presser foot 60 pivotally supported by the pin 71 on the presser link 57 is moved from the leg 52 to the workpiece insertion port 54. Try to move in the direction to enter.

  The crank cam 61 can rotate around the bolt 72 spanned between the main bodies 51 and 51 by operating the wedge pushing handle 76. The crank cam 61 has two engagement recesses 73 and 74 with a bolt 72 interposed therebetween. In the clamp no-load state shown in FIG. 7, the engagement pin 75 is engaged with one engagement recess 73, and FIG. The engagement pin 75 is engaged with the other engagement recess 74 in the clamp load state shown in FIG. The crank cam 61 is connected to the wedge 63 via the spring rod 62 and is always urged to rotate counterclockwise about the bolt 72. The wedge 63 is movable in parallel with the rack surface of the rack plate 65 while being rack-engaged with the rack plate 65 fixed between the main bodies 51 and 51. In order to allow this, the rack plate 65 is provided with a spring 77.

  The action of the intact clamp 50 will be described. In the unloaded state shown in FIG. 7, since the engagement pin 75 is engaged with the engagement recess 73 of the crank cam 61, the spring urging by the spring rod 62 is performed. Even if it receives, it does not rotate counterclockwise around the bolt 72 but is held in the same position. Accordingly, the wedge 63 maintains the position shown in FIG. 7 without protruding toward the workpiece insertion port 54.

  When the workpiece W is inserted into the workpiece insertion port 54 in this clamp-unloaded state and the wedge pushing handle 76 is rotated in the clockwise direction, the engagement between the engagement pin 75 and the engagement recess 73 is released. As the clockwise rotation occurs, the wedge 63 moves in parallel along the rack plate 65, moves in a direction to enter the workpiece insertion port 54 from the leg portion 53, and finally comes into contact with the side surface of the workpiece W on the leg portion 53 side. The wedge 63 can be moved from FIG. 7 to FIG. 8 and pressed against the workpiece W only by half-turning the wedge pushing handle 76. When the wedge 63 hits the workpiece W, the spring 77 contracts and engages with the rack surface of the rack plate 65. In FIG. 8, the engagement pin 75 is housed in the back of the engagement recess 74. This is the position when the thickness of the workpiece W is the minimum value within the allowable range, and the thicker workpiece W is When inserted into the workpiece insertion port 54, a state in which the engagement pin 75 is in contact with the side surface of the workpiece W on the leg 53 side at a position where it does not reach the depth of the engagement recess 74 is obtained.

  After the wedge 63 is brought into contact with the side surface of the workpiece W on the leg 53 side in this way, when the suspension ring 55 is lifted, the presser foot 60 is moved from the leg 52 into the workpiece insertion port 54 as described above. It moves in the direction of entry, presses against the side surface of the workpiece W on the leg portion 52 side, and presses and clamps the workpiece W between the presser foot 60 and the wedge 63 with a tightening force according to the load, thereby enabling lifting. . According to this clamp, in a normal lifting operation, since the workpiece W is sandwiched in surface contact with the presser foot 60 and the wedge 63, it functions as an intact clamp that is not damaged by engagement with the cam teeth.

  However, as a safety means for preventing slipping when oil or water adheres to the side surface of the workpiece W and the friction coefficient decreases, the stopper cam 58 is automatically applied when the workpiece W slips down. Is protruded from the leg portion 52 into the workpiece insertion port 54. That is, the stopper cam guide 59 pivotally supported by the pin 78 with respect to the main body 51 and urged to rotate counterclockwise is retracted buried in the main body leg portion 52 when the clamp is not loaded (FIG. 7). In the clamp load state (FIG. 8), the handle 79 enters the workpiece insertion port 54 by operating the handle 79 in the clockwise direction in the drawing, and the side surface of the workpiece W on the leg 52 side. Abut. When the workpiece W slides down and the tip of the stopper cam guide 59 is disengaged from the side surface of the workpiece W on the leg 52 side, the stopper cam guide 59 is rotated counterclockwise by the spring force. 58 also rotates in the same direction, bites into the side surface of the workpiece W on the leg portion 52 side, and prevents sliding.

  Every time the clamp 50 shifts from the no-load state (FIG. 7) to the load state (FIG. 8), the crank cam 61 rotates in the clockwise direction. The number of operations of 50 can be grasped. Therefore, in this embodiment, a history display device 80 including a sensor 81 that detects the movement of the crank cam 61 is incorporated in the clamp 50.

  The configuration, operation, action, and operation of the history display device 80 may be substantially the same as the history display device 32 incorporated in the clamp 10 in the first embodiment, but the sensor 33 is not clamped in the history display device 32 described above. In the load state, the clamp load state is determined by detecting that the link arm 24 at a distant position is approaching, whereas the history display device 80 in this embodiment is in a close position in the clamp no-load state. The clamp load state is determined by detecting that the crank cam 61 is separated. Therefore, in the example of FIG. 6, when there is a ΔV (decrease) of a certain slope or more as seen in the D section, it is determined that the state has shifted to the clamp load state, and as described above. A process of incrementing the total cumulative count number and the monthly cumulative count number by one is performed.

It is a no-load state figure of the clamp for vertical suspension incorporating the history display device by the present invention. It is a load state figure of this clamp. It is a schematic block diagram of this log | history display apparatus. It is a notional block diagram of ROM in this log | history display apparatus. It is a figure explaining the principle of the metal detection operation | movement by the metal sensor in this log | history display apparatus. It is a graph which shows the relationship between the output value change of the metal sensor in this log | history display apparatus, and the determination by CPU. It is a no-load state diagram of an intact clamp for vertical suspension incorporating a history display device according to the present invention. It is a load state figure of this clamp.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vertical suspension clamp 11 Main body 18 Workpiece insertion port 19 Turning jaw 20 Cam 23 Suspension ring 24 Link arm 32 History display device 33 Metal sensor (detection means)
34 A / D converter 35 CPU (control means)
36 LCD (display means)
37, 38 Operation switch 39 Battery 40 ROM (storage means)
400 Cumulative count storage unit 401 (401-1 to 401-12) Monthly count storage unit 41 Calendar

Claims (6)

A clamp body with a workpiece insertion port, a swiveling jaw that protrudes on one side of the workpiece insertion port, a cam that can project on the other side of the workpiece insertion port, a suspension ring, and the suspension ring relative to the clamp body In a suspension clamp having a link arm for connecting the suspension ring and the cam so that the cam protrudes from the workpiece insertion port when the link clamp is lifted to the position where the link arm is in a load state from the position when the suspension clamp is unloaded. Detection means for detecting movement to the position, storage means for storing the number of clamp operations, and updating each time the detection means detects the movement of the link arm by incrementing the number of clamp operations stored in the storage means by one. A suspension clamp history characterized by comprising: counter means for storing; and display means for displaying the cumulative number of clamp operations stored in the storage means. Display devices. Clamp body provided with a workpiece insertion port, a suspension ring, a presser provided to protrude from one side to the workpiece insertion port when the suspension ring is raised relative to the clamp body, a crank cam, and a crank cam In a suspension clamp having a wedge provided so as to protrude from the other side to the workpiece insertion opening when the handle is rotated by a handle operation, the position when the crank cam is in a loaded state from the position in the unloaded state Detecting means for detecting the rotation movement, storage means for storing the number of times of clamping operation, and incrementing the number of clamping operations stored in the storage means every time the detecting means detects the rotational movement of the crank cam. Counter means for updating and storing, and display means for displaying the cumulative number of clamping operations stored in the storage means. The history display apparatus of the hanging clamp and. The detecting means detects that the link arm or the crank cam at a distant position is in a loaded state when the suspension clamp is not loaded, or approaches when the suspension clamp is unloaded. The suspension clamp history display device according to claim 1 or 2, wherein the link arm or the crank cam at a position is detected to be separated when the load is in a load state. The detecting means comprises a non-contact type metal sensor that detects the approach or withdrawal of the link arm or the crank cam , which is a metal body, by changing the magnetic flux density, and converts the voltage into a voltage and outputs the voltage. The history display device of the hanging clamp according to claim 1 or 2 . The storage means includes a cumulative count recording section that stores the total cumulative number of clamping operations, and a plurality of monthly count recording sections that store the number of monthly clamping operations, and the control means is configured such that the detection means is the link arm or the crank. The suspension according to claim 1 or 2 , wherein each time a movement of the cam is detected, the number of clamp operations stored in the cumulative count recording unit and the monthly count recording unit of the month is incremented by one and stored. Clamp history display device. The control means causes the display means to automatically display the cumulative clamp operation number after being updated when the detection means detects the movement of the link arm or the crank cam , and the cumulative clamp stored in the storage means. 3. The suspension clamp history display device according to claim 1, wherein the display means is controlled so that the number of operations is displayed on the display means at any time by a switch operation.

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