JPH07113569B2 - Automatic weighing device hopper gate opening / closing device - Google Patents

Description

TECHNICAL FIELD The present invention relates to an opening / closing mechanism of a hopper of an automatic weighing device and a drive device for operating the same.

(Prior Art) As can be seen from U.S. Pat. No. 4,705,125, conventionally, a rotary disk is attached to the shaft of a stepping motor, and cams for opening and closing a hopper are fixed on both sides of the rotary disk, and a predetermined stepping motor is used. The link mechanism of the double-opening hopper was operated by rotating the left and right angles to open and close the hopper corresponding to each double-opening hopper.

(Problems to be Solved by the Invention) The present invention has been invented based on the above-mentioned conventional example. In the conventional example, a rotating disk is attached to a stepping motor, and further, for opening and closing a hopper on both sides of the rotating disk. Since the cam for the hopper was fixed and the cam for opening and closing the hopper and the opening and closing of the double-opening hopper corresponded to each other, the opening and closing of the hopper became indirect, the number of parts was large, and there was a problem in the accuracy of the processing of the cam. The rotation control of the stepping motor became complicated and required adjustment.

(Means for Solving the Problems) According to the present invention, a pool hopper provided with a double-opening opening / closing gate that independently opens and closes in the opposite direction is arranged on the front upper part of a mounting cover, and the double-opening is provided below the pool hopper. Opposing each of the opening and closing gates, and at a symmetrical site with the pool hopper as the apex, a pair of weighing hoppers having a single-opening opening and closing gate that opens and closes outward is arranged, and on the back surface of the mounting cover, In the hopper gate opening / closing device of the automatic weighing device provided with the actuators for driving the opening / closing gates of the pool hopper and the opening / closing gates of the pair of weighing hoppers, the pool hopper on the back of the mounting cover and the left and right weighing devices A first control motor and a second control motor, which are the above actuators, are provided on the central axis of the hopper. Installed and first
The opening / closing member connected to the control motor shaft selectively engages with the opening / closing mechanism of the double opening / closing gate of the pool hopper to selectively open / close the opening / closing gate, and is also connected to the second control motor shaft. The opening / closing elements are selectively engaged with the opening / closing mechanism of the single-opening opening / closing gates of the pair of weighing hoppers to selectively open / close the single-opening opening / closing gates of the respective weighing hoppers. And

(Operation) According to the above configuration, in the automatic weighing device capable of efficiently weighing the objects to be weighed by the double-opening pool hopper and the pair of weighing hoppers arranged below the pool hopper, the arrangement relationship of each hopper is changed. The opening / closing selection of the double opening / closing gate of the pool hopper can be selectively performed by engaging the opening / closing member connected to the motor shaft with each opening / closing mechanism of the opening / closing gate by selecting left / right rotation of the first control motor. It is possible to control the opening / closing, and to select the opening / closing of the single-opening / closing gate of each weighing hopper, to the left of the second control motor,
By selecting the right rotation, the opening / closing element connected to the motor shaft can be engaged with each opening / closing mechanism of each one-way opening / closing gate to selectively control the opening / closing. In this way, since it is possible to reduce the number of actuators installed in the restricted space on the back surface of the mounting cover of each hopper and reduce the number of parts of the opening / closing mechanism, it is possible to assemble the opening / closing mechanism of the hopper and make adjustments after assembly. Maintenance management and control of the drive device of the opening / closing mechanism can be easily performed.

(Example) A specific example of the example will be described with reference to the drawings.
FIG. 1 shows a drive device B for operating an opening / closing mechanism A of a hopper of an automatic weighing device, 1 is a front cover, and this front cover 1 is screwed to the front surface of the main body of the automatic weighing device via a seal member. It is fixed by 2 etc. Reference numeral 3 denotes a control motor such as a stepping motor or a servomotor attached to the rear portion of the front cover 1 (this portion is housed in the main body), the shaft of which protrudes in front of the front cover 1 and a pair of opening and closing are provided on this shaft. Members are provided, and the above-mentioned opening / closing member is specifically described as a plate or a roller as an embodiment, but the present invention is not limited to this. A plate 4 is fixed to the shaft by screws 5 or the like, and rollers 6 are rotatably attached to both ends of the plate 4 on roller shafts 7 fixed to the plate 4. Reference numeral 9 is a hanger for a pool hopper fixed to the front cover 1 with a screw 8 or the like, and a locking pin 10 for removably locking the pool hopper is fixed to the upper part of the hanger 9 for the pool hopper (in the drawing, the first Since the drawing is a perspective view, the locking pin on the right side of the pool hopper is not shown.) When the pool hopper is locked to the locking pin 10 below the hanger 9 for the pool hopper, the pulley hopper is attached to the device body side. A rotation stop pin 11 of the pool hopper is fixed to prevent rotation around the locking pin 10. 12
Are symmetrically installed on the front cover 1 with a hanger for weighing hoppers that can be moved up and down with a certain gap. This hanger 12 for weighing hoppers is for locking the weighing hoppers that detachably locks the weighing hoppers to the upper part. Locking pin 13 is fixed (in FIG. 1, the locking pin 13 on the left side of the locking pin for the weighing hopper is not shown because it is a perspective view), and the locking pin 13 for the weighing hopper is engaged with the weighing hopper. The hanger 12 for the weighing hopper is provided with a rotation stop rod 14 for preventing the weighing hopper from rotating around the locking pin 13 as an axis when stopped. Reference numeral 15 denotes a control (not shown) shaft such as a stepping motor or a servomotor built in the front cover 1, which is provided with one opening / closing element. However, the present invention is not limited to this. A rotary plate 16 is fixed to the shaft 15 with a screw or the like, and a roller 17 is rotatably supported on the tip of the rotary plate 16. 18 is a load cell, one for each of the two weighing hoppers, accommodated in the front cover 1, the tip of which is connected to the hanger 12 for the weighing hopper, and the other end is fixed to the fixed bracket 19. Has been done.

Next, the pool hopper 20 shown in FIG. 2 will be described. The drawing is a view seen from the apparatus main body side. The pool hopper 20 is a double-opening hopper, and the pool hopper 20 is supported by a pair of left and right support members 21 and supported. The member 21 is formed with a hanger 23 having an engaging groove 22 that engages with the engaging pin 10 of the pool hopper hanger 9, and the engaging groove 22 engages with the engaging pin 10 of FIG. Rotation stop pin provided on the pool hopper hanger 9 for rotation of the entire hopper 20 toward the device body
It's blocked at 11. The opening / closing gate 24 of the double-opening pool hopper 20 is shown in FIG. 2 (a perspective view of the opening / closing gate 24 on the front side is shown, but the opening / closing gate 24 is also provided on the opposite side to the upper edge of the opening / closing gate 24. Is not shown because it overlaps with the support lot 26), so this opening / closing gate 24 has a pair of gate links 25, one end of which is the pulley hopper.
It is rotatably supported by a support lot 26 hung over 20. The upper end of a link 27 is pivotally supported by a pin 28 inside the support lot 26, and the lower end of the link 27 is pivotally supported by a fulcrum pin 31 on a support member 21. A pin 29 is pivotally supported on the upper end of the rotary plate 30 so as to be rotatable. Below the rotating plate 30, there is provided a sliding contact portion 30a with which the roller of the drive unit B faces. Of the pins, the pins 28 and 29 are the pivotal fulcrum, and the pin 31
The part of is a part bent in the direction of the arrow. On the other hand, the gate link 25 rotates in the arrow direction around the support lot 26 to open and close the opening / closing gate 24. Reference numeral 32 denotes a spring which pulls both rotary plates 30 inward, which is mounted between the rotary plates 30 and serves to close the opening / closing gate. 33 is a rotating plate 30
Of the pool hopper 20 for discharging the objects to be weighed, which is a stopper provided on the support member 21 for preventing the pulling-in of the pool hopper 20 at a fixed position (the stopper on the front side is not shown in FIG. 2 because it is a perspective view). Is a distribution plate for distributing the objects to be weighed to a pair of weighing hoppers 34 near the. Next, the weighing hopper 34 shown in FIG. 3 will be described. The weighing hopper 34 comprises a single-opening gate 35. The weighing hopper 34 is supported by a pair of left and right supporting members 36, and the weighing hopper is provided at the upper end of the supporting member 36. A pin 37 that controls the opening / closing of the single-opening / closing gate 35 is pivotally supported by a fixing member 35 ′ integrated with the single-opening gate 35 of 34,
A link 39 is pivotally supported by a pin 38 serving as a movement fulcrum of the single-opening gate 35 at a position located inside the pin 37 of the fixing member 35 ′, while a fulcrum pin 40 is a fulcrum below the supporting member 36. The rotating plate 41 is
Is provided with a sliding contact portion 41a (the left sliding contact portion is not shown in FIG. 3 because the drawing is a perspective view). The upper end of the rotary plate 41 and the link 39 are flexibly supported by a pin 42. The reference numeral 43 designates a pin standing on the support member 36, and a spring 45 is attached between the pin 43 standing on the rotating plate 41 and the pin 45 standing on the rotating plate 41 in order to close the gate 35. A stopper 36 'is provided on the support member 36 for positioning the link mechanism by the spring 45 in the closed state. Reference numeral 46 denotes a hanger extending below the support member 36. The hanger 46 has an engaging groove 47.
47 is a locking pin 13 provided on the hanger 12 of the drive unit B of FIG.
Is detachably engaged with. When the weighing hopper 34 is engaged with the locking pin 13, the weighing hopper 34 moves about the locking pin 13 in the direction of rotating toward the main body of the apparatus, so that the rotation stopping rod 14 prevents the movement. Next, the opening and closing operation of the hopper gate of the above automatic weighing device will be described. Regarding a conventionally well-known combination calculation automatic weighing device, an embodiment thereof will be described. The object to be weighed is supplied to the pool hopper 20, and this is supplied. The weighed objects are supplied to the empty weighing hopper 34, but the objects to be weighed are not supplied to the weighing hoppers 34, 34 when the automatic weighing device is started. When the objects to be weighed are supplied from the pool hopper 20 to the weighing hopper 34 in this state, it is determined in advance whether the objects to be weighed are put in from the left weighing hopper 34 or the right weighing hopper 34. Next, the object to be weighed is weighed with the weighing stopper 34, and the object to be weighed in the weighing hopper 34, which is an appropriate weighing value with respect to a preset limit value, is opened and closed in the opening / closing gate 35 of the weighing hopper 34 for the next step. Discharge, but the weighing hopper 34 emptied from the pool hopper 20 in response to the empty signal after the above-mentioned object to be weighed is discharged.
To be weighed. The supply from the pool hopper 20 to the weighing hopper 34 is performed in association with the emptied weighing hopper 34 by the left rotation or the right rotation of the control motor 3, and is provided on the plate 4 around the axis of the stepping motor 3. The formed roller 6 draws an arc, and comes into sliding contact with the roller 6 to come into contact with a sliding contact portion 30a that opens and closes one of the opening and closing gates. In this contact state, at the initial stage of contact, the opening / closing gate 24
The opening and closing operation speed of the roller gradually increases, and in the middle of the opening and closing operation speed, the roller 6 pushes up the sliding contact portion 30a and the sliding contact portion 30a becomes horizontal, so that the opening and closing gate 24 maintains the opening and closing position. When the opening / closing gate 24 is switched to the closing direction, the control motor 3 temporarily stops and then reverses. Therefore, at this time, the movement of the opening / closing gate becomes slow at that moment. The opening / closing gate 24 can be controlled by the roller 5 and the sliding contact portion 30a within a mechanical range, and the opening / closing angle and opening / closing of the opening / closing gate 24 can be controlled by electrically controlling the number of pulses per second of the control motor 3. The speed can be controlled, and the opening / closing speed of the opening / closing gate can be arbitrarily adjusted by the object to be measured by controlling the initial rotation and the latter rotation of the control motor 3. This point is as described in detail in US Pat. No. 4,705,125. Next, the opening / closing operation of the opening / closing gate 35 of the weighing hopper 34 will be described. The shaft 15 of the control motor rotates left or right by a predetermined angle according to the number of pulses thereof. Weighed,
The metering hopper 34 discharges a metering value that is appropriate for the set value. At this time, the shaft 15 of the stepping motor receives the discharge signal of the selected metering hopper 34.
Is selected to rotate left or right. For example, the case where the right weighing hopper 34 is selected in FIG. 3 and the object to be weighed is discharged will be described. The shaft 15 of the stepping motor rotates to the right and the roller 17 contacts the sliding contact portion 41a of the rotating plate 41. With the fulcrum pins 38 and 40 as fulcrums, the link mechanism bends to open the opening / closing gate 35 at the pin 42, opens the opening / closing gate, and when the object to be weighed is completely discharged, the control motor rotates in reverse, that is, counterclockwise. The spring 45 causes the link mechanism to return to its original state, and the opening / closing gate 35 is closed. Even when the left weighing hopper 34 is selected, the opening / closing gate 35 is similarly opened / closed. Also in this case, the opening / closing amount of the opening / closing gate 35 is adjusted by adjusting the number of pulses per second of the stepping motor,
The opening and closing speed can be adjusted. This can be understood from the description of the above-mentioned US patent specifications.

Next, an example of the operation of the pool hopper 20 and the weighing hopper 34 will be described with reference to FIG. 4. It is determined whether or not the objects to be weighed discharged in step S ₁ are packaged, and if YES, the process proceeds to step S ₂ . Select the optimum combination by combining the weighing values of each weighing hopper. Then select the opening and closing of the gates of the signal receiving and metering hopper of the selected metered hoppers the process proceeds to step S _3, the control motor in this selection signal is rotated in a selected direction, the metering hopper to be weighed Then, the process goes to step S ₄ , and the pool hopper gate of the example corresponding to the gate is opened by the closing timing signal of the discharged weighing hopper to supply the objects to be weighed to the empty weighing hopper. Next, in step S ₅ , when the pool hopper is closed, the time set by the signal (usually a timer is often used) is activated, although not shown in the figure, a conventionally known supply device (supply trough, distribution table, etc.) is activated. It supplies the objects to be weighed to the empty pool hopper. As described above, the double-opening hopper 20 is the pool hopper, and the pair of single-opening hoppers at the next position are described as the weighing hoppers.The double-opening hopper 20 is the weighing hopper, and the pair of single-opening hoppers at the second position is the memory hopper. It is a technical matter that those skilled in the art can naturally consider to configure the automatic weighing device as.

(Effect) As described in the conventionally-known U.S. Pat. No. 4,705,125, the opening / closing gate of the shaft is controlled by opening / closing the opening / closing gate as compared with the case where a single control motor selects the opening / closing gate of the double-opening hopper by operating the cam. By attaching a pair of opening and closing members and selectively switching the rotation direction of the control motor, there is no need to use a conventionally known cam. Therefore, precision of cam processing is not required and adjustment is easy. In addition, a control motor that controls the opening and closing of a pair of single-opening hoppers corresponding to the opening and closing gates of the double-opening hopper is provided, and by selecting the rotation direction of this shaft, a single stepping motor with a single stepping motor is used. The opening and closing gate of the hopper is opened and closed by a single opening and closing element, so there is little noise, and the number of parts is reduced, which facilitates assembly and maintenance management. Since the opening and closing of the Isorezore of the hopper,
This has the effect of simplifying the adjustment and control. Also,
Space saving can also be achieved by reducing the number of actuators installed in the restricted space on the back surface of the mounting cover of each hopper.

[Brief description of drawings]

FIG. 1 is a perspective view showing a drive device, FIG. 2 is a perspective view of a double-opening hopper, FIG. 3 is a perspective view showing a pair of single-opening hoppers as a pair, and FIG. 4 is an example of a flowchart of each hopper. A: Opening / closing mechanism of hopper, B: Driving device 1 ... Front cover, 3 ... Control motor 4 ... Plate, 6 ... Roller 9 ... Pool hopper hanger 10 ... Locking pin 12 ... Weighing Hanger for hopper 17 …… Roller, 20 …… Pool hopper 34 …… Weighing hopper, 46 …… Hanger

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-62-249018 (JP, A) JP-A-62-90515 (JP, A) JP-A-60-15524 (JP, A) JP-A-2- 78919 (JP, A)

Claims (1)

[Claims] 1. A pool hopper provided with a double-opening opening / closing gate that opens and closes in opposite directions independently of each other is provided on the front upper part of the mounting cover, and faces each of the double-opening opening / closing gates below the pool hopper. In addition, a pair of weighing hoppers equipped with a single-sided opening / closing gate that opens and closes in the outward direction are arranged at symmetrical parts with the pool hopper as the apex, and the above-mentioned double-sided opening / closing gate of the pool hopper is installed on the back surface of the mounting cover. Also, in a hopper gate opening / closing device of an automatic weighing device provided with an actuator that drives each opening / closing mechanism of a pair of single-sided opening / closing gates of the weighing hopper, on the central axis for the pool hopper and the left and right weighing hoppers on the back surface of the mounting cover, The first control motor and the second control motor, which are actuators, are installed, and the first control motor shaft The opening / closing element connected selectively to the opening / closing mechanism of the double opening / closing gate of the pool hopper by the connected opening / closing member to selectively open / close the opening / closing gate, and by the opening / closing element connected to the second control motor shaft. An automatic weighing device characterized by being arranged to selectively engage with the opening / closing mechanism of each opening / closing gate of each of the pair of weighing hoppers to selectively open / close the opening / closing gate of each weighing hopper. Hopper gate opening and closing device.