JP4596956B2 - Brush pressure adjustment device for floor cleaning machine - Google Patents

Description

  The present invention is used in the field of a floor cleaning machine that cleans the floor surface (including on the road) with a roll brush attached to the bottom while traveling. Specifically, the ground pressure of the roll brush is described above. The present invention relates to a brush pressure adjusting device that can automatically adjust the pressure.

  The “traveling vehicle dust chute device” described in Patent Document 1 describes a technology related to a traveling cleaning vehicle that sweeps up dust on a floor surface or a road surface with a main brush and collects it in a hopper while traveling. Among these, the main brush raises the main brush supported by the rocker arm to a position away from the floor surface by pulling up the chain connected to the tip of the rocker arm, or the floor as a cleaning surface. It is configured to descend on the surface. The rocker arm is configured such that a load is always applied downward by the weight of the brush, and the lower limit position of the brush can be changed by adjusting with a screw. Therefore, if the brush wears and the brush contact pressure with respect to the floor surface becomes weak, it is possible to increase the contact pressure by changing the screw position, and it is also possible to decrease it.

In addition, “Floor surface cleaning brush pressure automatic adjusting device” described in Patent Document 2 describes that the ground pressure of a brush can be automatically adjusted by controlling a hydraulic motor.
Utility Model Registration No. 2532667 Japanese Utility Model Publication No. 6-16577

  According to Patent Document 1, the brush supported by the rocker arm is lowered to a predetermined height together with the rocker arm and brought into contact with the floor surface. Therefore, a predetermined contact pressure is applied to a flat floor surface. Will come in contact. However, if there is a concave part on the floor surface, the contact pressure on the floor surface of the brush in that concave part will decrease. Conversely, if there is a convex part on the floor surface, a large load (shock) The floor surface cannot be cleaned with a uniform contact pressure at all times. As a result, there was a problem that the floor surface could not be cleaned uniformly and the floor surface of carpets and carpets was damaged.

  Further, according to Patent Document 2, by detecting a change in the contact pressure of the brush to the floor surface caused by the unevenness of the floor surface, the hydraulic motor is controlled to drive the brush up and down, and the floor The contact pressure between the surface and the brush can be made constant. However, it is good to run on a floor with relatively gentle unevenness, but if the unevenness changes suddenly, it is difficult to move the brush up and down sensitively after detecting the change. A so-called shock occurs between the floor and the floor, and the brush may be damaged. Also, a large current temporarily flows to the motor that drives the brush, which is not preferable. Further, since various control devices are required, the cost is increased.

  The present invention has been made in order to solve the above-described problems, and a technical problem thereof is that cleaning can be performed with a desired contact pressure in cleaning a floor surface where unevenness is repeated, and a brush. It is possible to respond to changes in the brush contact pressure caused by wear, etc. Especially, the floor surface such as carpet is cleaned by reducing the shock at the uneven step and keeping the contact pressure on the brush floor constant at all times. Is to provide a brush pressure adjusting device for a floor cleaning machine that is devised so as to prevent damage to the carpet surface and the brush as much as possible.

(1) In order to solve the above technical problem, the invention according to claim 1 is configured such that while traveling, dust on the floor surface or road surface is swept up with a rotating roll brush and collected in a hopper. a surface cleaning machine, a roll support arm in supporting the above roll brush, mounted for vertical movement against the vehicle body so as roll brush moves up and down to the floor surface, and, in this role brush it is above The lifting force of the arm lifting means that elastically biases the roll brush supported by the roll support arm is applied, and the lifting force by the arm lifting means and the rotation of the roll brush are determined from the weight of the roll brush. sometimes it Ukiagaro upward occur when you reaction force and the brush pressing force and is configured to brush pressure adjusting device for floor cleaning machines to be constant obtained by subtracting met And
The arm lifting means includes a tension spring that urges the roll brush supported by the roll support arm upward, and a compression spring that urges the roll brush supported by the roll support arm in the floor surface direction. When the roll brush approaches the vehicle body during traveling, the tension load of the tension spring decreases and the load of the compression spring increases. Conversely, when the roll brush moves away from the vehicle body, the tension load of the tension spring The two springs are configured to cooperate with each other so as to maintain a constant pressing force of the roll brush so that the load of the compression spring decreases .

(2) The invention according to claim 2, the spring constant of the front Symbol tension spring before Symbol compression spring is characterized in that it is set to the same.

(3) The invention according to claim 3, the vehicle body side, is attached to the motor cylinder as a function adjusting means for adjusting the force acting on the roll brush, a bracket fixed to the distal end portion of the motor cylinder Further, two compression springs as the arm pulling means are arranged on the bracket, and one compression spring urges the roll brush attached to the roll support arm upward in the pulling direction. The other compression spring is characterized in that the roll brush is pressed in the direction of the floor and urged in the direction of pressurization.

(4) Further, the invention according to claim 4, place each compression spring on its upper side and the lower side across the bracket, the upper compression spring pulls the roll support arm, the lower side of the compression spring The roll support arm is configured to be pressurized toward the floor surface.

According to the means described in the above (1), the brush pressing force obtained by subtracting the pulling force by the arm pulling means and the upward reaction force (force to lift) generated during the rotation of the brush from the brush weight is constant. since constructed so that, even if there was unevenness in the floor, always intended to contact with the same contact pressure, shock phenomenon occurring due to the brush weight difficulty occurs Kunar. Therefore, damage to the floor and the roll brush does not occur. Such features can be demonstrated.

Further , according to the means described in ( 2 ) above, the object of the present invention can be achieved at a relatively low cost, in addition to the action exhibited by the means (1). In addition, a stable brush pressing force can be obtained by replacing the spring.

According to the means described in ( 3 ) above, the motor cylinder can be operated to change the contact state of the roll brush with the floor surface. That is, since the roll brush strengthen contact pressure by close to the floor surface, it is possible to weaken the contact pressure by away, also naturally brush wear can respond. Moreover, the effect | action which each means of said (1) and ( 2 ) exhibits can be exhibited collectively.

Furthermore, according to the means described in ( 4 ) above, the object of the present invention can be achieved with a relatively simple spring configuration.

As described above, according to the brush pressure adjusting device for a floor cleaning machine according to the present invention, even when cleaning a floor surface with repeated unevenness, the roll brush can be brought into contact with the floor surface with a desired contact pressure. Therefore, stable cleaning can be performed without damaging the floor and brush, and the floor and carpet can be cleaned cleanly.

In addition, according to the present invention, it is possible to cope with a change in contact pressure that occurs due to brush wear or the like, and in particular, it is possible to alleviate shocks at uneven steps and keep the contact pressure on the floor constantly constant. Therefore, it has an advantage that a stable cleaning effect can be exhibited even on a floor surface with many irregularities such as a carpet.

  Hereinafter, a brush pressure adjusting device for a floor cleaning machine according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a floor cleaning machine equipped with the brush pressure adjusting device according to the present invention. 1 is a vehicle body, 2 is a driving handle, 3 is a front wheel, 4 is a rear wheel, and 5 is a roll brush in which a brush 5T is implanted on the peripheral surface. The rear wheel 4 and the roll brush 5 are driven by a motor (not shown) as a drive source.

Also, 6 is a dust hopper, 7 is a suction duct, 8 is a dust box, 9 is a filter, 10 is a filter dust box, 11 is a blower duct, 12 is a suction blower driven by a power source, and 13 is a battery. It is mounted on the vehicle body 1. Reference numeral 14 denotes a floor surface to be cleaned.

  In the above configuration, when the roll brush 5 is rotated and the suction blower 12 is operated while the vehicle body 1 is traveling, relatively large dust swept up by the rotation of the roll brush 5 is collected in the hopper 6, and fine dust is collected. In response to the suction action of the suction blower 12, the dust is collected from the dust duct 7 into the dust box 8. Further, the dust-containing air is filtered from the dust box 8 through the filter 9, and the filtered air is discharged to the outside through the filter box 10 and the blower duct 11. A brush suspension mechanism 20 is provided between the vehicle body 1 and the brush 5, and the suspension mechanism 20 is configured as described later.

For example, when the carpet (carpet) is cleaned using the roll brush 5, the required power varies depending on the depth of the roll brush 5, and the cleaning effect (the effect of collecting dust inside the carpet) depends on the depth of the roll brush 5. ). Further, if the roll brush 5 is excessively pressed, the brush 5T of the roll brush 5 only falls down, and a cleaning effect cannot be obtained with respect to an increase in motor power, and the carpet is damaged due to excessive pressing.

  Therefore, as shown in FIG. 2, an appropriate pressing force (F) of the roll brush 5 and an indentation depth (x) of the roll brush 5 are important requirements. The indentation depth (x) and required power of the roll brush 5 vary depending on the brush properties (brush hair stiffness, density, etc.) and the carpet properties (carpet hair leg length, density, pile diameter, etc.). For example, the characteristics shown in FIG. In FIG. 3, the horizontal axis represents the pressing depth x (mm) of the roll brush 5 and the pressing force F (N), and the vertical axis represents the motor current A (brush power).

  The problem is that a certain brush pressing force needs to be maintained due to the unevenness of the carpet surface during cleaning. That is, it is necessary to stabilize the driving power of the roll brush 5 against the unevenness (unevenness) of the carpet existing between the wheels 3 and 4 of the cleaner. 4 to 8 show problems in this case. In these drawings, 1a is a chassis of the vehicle body, 15 is rotatably attached to one end of the chassis 1a, and the other end is a roll brush. 5 is a roll support arm attached to the shaft core portion 5a so as to be vertically movable and rotatable.

  FIG. 4 shows the carpet in a flat and stable state. There are examples shown in FIGS. 5 to 8 as problems when the carpet is not landed and the brush pressing force is not constant.

  That is, as shown in FIG. 5, the roll brush 5 strongly hits the convex portion 16 a in the state of the uneven land 1 where the narrow convex portion 16 a has the carpet, and the carpet is locally damaged by long-term use. I will give it. As shown in FIG. 6, in the state of non-land 2 having a concave portion 16b with a narrow carpet width, the contact of the brush 5 with the concave portion 16b becomes weak, and due to dust inside the carpet due to insufficient cleaning after many years of use. Darkening of carpet (conspicuous spots) occurs. Moreover, as shown in FIG. 7 and FIG. 8, in the case of non-land 3 and 4 having a step 17 on the carpet surface, when the brush height changes up and down as viewed from the cleaning machine reference plane, The same problem as the unevenness (1) and (2) in FIGS. 5 and 6 occurs. Accordingly, in the present invention, various improvements have been made to the brush suspension mechanism 20 as shown in FIGS.

  FIG. 9 shows the force relationship acting on the configuration of the brush suspension mechanism 20. The brush suspension mechanism 20 includes a roll support arm 15 that supports the roll brush 5, and the roll brush 5 against the floor surface. An arm that is attached to the chassis 1a of the vehicle body so as to move up and down, and that elastically biases the roll brush 5 supported by the arm 15 between the roll support arm 15 and the vehicle body side. A tension spring 22 as a lifting means is provided between the chassis 1a and the shaft core 5a of the roll brush 5 via a bracket 27, and a pulling force (SF) from the roll brush weight W by the tension spring 22 as the arm lifting means. And the brush pressing force (F) obtained by subtracting the upward reaction force (BF) generated when the brush rotates. . Here, the brush pressing force (F) is adjusted by the pulling force (SF) of the tension spring 22, and F = W− (BF + SF) is obtained.

  Moreover, although the vertical reaction force (BF) accompanying brush rotation changes with brush properties and carpet properties, the characteristic shown by C2 of FIG. 10 is obtained as an example.

  FIG. 11 shows a brush suspension mechanism that uses a constant load spring 23 as the arm lifting means, and obtains a constant brush pressing force (F) against unevenness of the carpet surface. By using the constant load spring 23 as the brush lifting spring, a constant F value, that is, F = W− (BF + SF) is obtained with respect to the vertical movement of the roll brush 5. That is, here, the weight (W) of the roll brush is constant, the reaction force (BF) is constant, and (SF) keeps raising the constant load even if the height is changed by the constant load spring 23.

  The roll brush suspension mechanism 20 of FIGS. 12 and 14 is a further improvement of the roll brush suspension mechanism of FIG. 11, and these suspension mechanisms are effective in practical use.

  The roll brush suspension mechanism 20 shown in FIG. 12 uses a tension spring 22 and a compression spring 24, and an L-shaped lever 25 can be rotated on the shaft core 5 a of the roll brush 5 and the roll support arm 15. The compression spring 24 is pressurized via a spring receiver 28 having a guide rod which is pivotally installed and is slidably inserted between the bracket 26 and the lever 25 attached to the chassis 1a. The tension spring 22 is provided between the lever 25 and the chassis 1a. The pressurized state of the compression spring 24 is, for example, a state in which a compression spring having a free length of 100 mm is 80 mm in length and compressed by 20 mm.

  Here, between the spring force (CSF) and reaction force (BF) of the compression spring 24, the pulling force (SF) of the tension spring 22, and the own weight (W) and (F) of the roll brush 5, F = W- (BF + SF) + CSF. The relationship is obtained.

  FIG. 13 shows the characteristics of the roll brush suspension mechanism 20 of FIG. 12, C3 is the CSF characteristics, C4 is the SF characteristics, and the spring constants of the tension spring 22 and the compression spring 24 are set to be the same. For example, SF and CSF can cancel each other's movement and always maintain a constant spring force.

  Thus, as the arm pulling means, the tension spring 22 provided between the roll support arm 15 and the vehicle body and urged above the roll brush 5 supported by the arm, and the roll support arm 15 and the vehicle body side as well. And a compression spring 24 that biases the roll brush 5 supported by the arm in the direction of the floor surface. When the roll brush 5 approaches the vehicle body 11 during traveling, the tensile load is reduced. In addition, the load of the compression spring 24 increases, and the two springs cooperate with each other to maintain the pressing force of the brush constant. Here, the constants of the tension spring 22 and the spring 24 of the compression spring were set to be the same.

The roll brush suspension mechanism 20 in FIG. 14 has a structure in which the lifting / lowering force (F) of the entire brush portion is varied using the motor cylinder 31 or the like in the suspension mechanism in FIG.

  In FIG. 14, 24a is a first compression spring, 24b is a second compression spring, 29 is a bracket, and 30 is a spring receiver. A tension spring 22 is provided between the chassis 1a and the lever 25. Further, a spring receiver 28 is attached to the lever 25, and a first compression spring 24a is provided through the guide rod 27 of the spring receiver 28. . The bracket 29 is provided on the guide rod 27 so as to be movable up and down, located above the first compression spring 24a. Further, a guide rod 27 is inserted into the bracket 29 and a second compression spring 24b is disposed. An upper portion of the second compression spring 24b is inserted with the guide rod 27 and a spring receiver 30 is disposed. A motor cylinder 31 fixed to the chassis 1 a is disposed on the bracket 29, and a cylinder rod 32 is connected to the bracket 29.

  By giving a large spring constant to the second compression spring 24b as compared with the first compression spring 24a, the second compression spring 24b becomes equivalent to that shown in FIG. Further, the second compression spring 24b exhibits an effect of relieving a shock at the time of starting and stopping the driving device of the motor cylinder 31. By changing the lowering position of the rod 32 of the motor cylinder 31 by (+), (−) with respect to the reference level, the pressing depth (x) of the roll brush 5 is changed, and as a result, the brush pressing force (F) Can be changed.

The schematic block diagram of the floor cleaning machine in embodiment of this invention. Operation | movement explanatory drawing of a floor cleaning machine. Operation | movement explanatory drawing of a floor cleaning machine. Operation | movement explanatory drawing of a floor cleaning machine. Operation | movement explanatory drawing about the problem of a floor cleaner. Operation | movement explanatory drawing about the problem of a floor cleaner. Operation | movement explanatory drawing about the problem of a floor cleaner. Operation | movement explanatory drawing about the problem of a floor cleaner. The block diagram of the brush suspension mechanism part of the brush pressure adjustment apparatus of the floor cleaning machine in embodiment of this invention. FIG. 10 is an operational characteristic diagram of the brush suspension mechanism of FIG. 9. The block diagram of the brush suspension mechanism part of the brush pressure adjustment apparatus of the floor cleaning machine in other embodiment of this invention. The block diagram of the brush suspension mechanism part of the brush pressure adjustment apparatus of the floor cleaning machine in other embodiment of this invention. FIG. 13 is an operational characteristic diagram of the brush suspension mechanism of FIG. 12. The block diagram of the brush suspension mechanism part of the brush pressure adjustment apparatus of the floor cleaning machine in the further embodiment of this invention.

DESCRIPTION OF SYMBOLS 5 ... Roll brush 15 ... Roll support arm 22 ... Tension spring 23 ... Constant load spring 24 ... Compression spring 24a ... Compression spring
24b ... compression spring 25 ... lever
29 ... Bracket 31 ... Motor cylinder

Claims (4)

Traveling raised sweeping a roll brush rotates dust on the floor surface or a road surface while a configuration was floor cleaner to collect in the hopper, the roll support arm in supporting the roll brush, roll brush bed mounted for vertical movement against the vehicle body so as to move vertically with respect to the surface, and, in the roll brush, arm pulling means for resiliently biased upward a roll brush which is supported on the roll support arm The lifting force of the roll brush and the brush pressing force obtained by subtracting the lifting force by the arm lifting means and the reaction force that floats upward when the roll brush rotates are constant from the weight of the roll brush. A brush pressure adjusting device for a floor cleaning machine configured to be,
The arm lifting means includes a tension spring that urges the roll brush supported by the roll support arm upward, and a compression spring that urges the roll brush supported by the roll support arm in the floor surface direction. When the roll brush approaches the vehicle body during traveling, the tension load of the tension spring decreases and the load of the compression spring increases. Conversely, when the roll brush moves away from the vehicle body, the tension load of the tension spring increases. The floor cleaning machine is characterized in that the two springs cooperate with each other to keep the pressing force of the roll brush constant so that the load of the compression spring decreases and the load of the compression spring decreases. Brush pressure adjustment device. Before SL tension spring and before Symbol spring constant of the compression spring, for floor cleaning machine brush pressure regulating device according to claim 1, characterized in that it is set to the same. On the body side, it is attached to the motor cylinder as the working force adjusting means for adjusting the force acting on the front Symbol roll brush, a bracket fixed to the distal end portion of the motor cylinder, and, the arm pulling against the bracket Two compression springs as means are arranged, and one compression spring biases the roll brush attached to the roll support arm upward in the pulling direction, and the other compression spring pushes the roll brush to the floor surface. The brush pressure adjusting device for a floor cleaning machine according to claim 1 or 2 , wherein the brush pressure adjusting device is configured to press in a direction and pressurize in a direction to pressurize . By placing each compression spring on its upper side and the lower side across the bracket, the upper compression spring pulls the roll support arm, the lower side of the compression spring is pressurized toward the roll support arm in the floor direction The brush pressure adjusting device for a floor cleaner according to claim 3 , wherein the brush pressure adjusting device is configured to press.

Images