JP2013144586A - Work transportation bogie - Google Patents

Abstract

PROBLEM TO BE SOLVED: To adjust wheel-installation pressure so as to make a proper state always occur, and to stably transport a work W, when transporting the work W of a heavy load in a process for assembling and so forth a variety of kinds of members, parts or the like to the work W.SOLUTION: In order to transport a work W along a transportation route face 5 of a transportation route, pedestal members 2 on each of which a plurality of portions of the work W are distributively installed are arranged at a connecting-part constituting body 4 at four points, air pallets 4 are arranged at these pedestal members 2, an installation member 33 is arranged at a ceiling plate 30 via a swirling device 31, a traveling unit 1 having traveling bogies 40 arranged at fore-and-aft two points is connected, a universal joint 45 and a push-moving operation member 46 are arranged at positions in fore-and-aft directions of the traveling bogies 40, and a ground-pressure adjusting air cylinder 47 is made to act on the push-moving operation member 46.

Description

  The present invention relates to a transport carriage for placing and transporting a workpiece, and in particular, manufacturing having a manufacturing process for placing a heavy workpiece and assembling or processing required parts and members. -It is related with the workpiece conveyance trolley | bogie used in order to convey a workpiece | work along an assembly line.

  Japanese Patent Application Laid-Open No. 2004-133867 discloses a conveyance method using an air pallet in order to reduce a load during conveyance when a heavy work is placed on a carriage and conveyed. The air pallet is configured so that a flexible bag is mounted on the lower surface of the support base disposed on the traveling floor, and compressed air is supplied in the bag and between the support base and the traveling floor. It is. By supplying compressed air into the bag, the support platform is lifted from the traveling floor surface, and a layer of compressed air is formed between the support platform and the traveling floor surface, thereby reducing the load of heavy workpieces during transportation. It is configured to reduce.

  Further, Patent Document 2 discloses a transport device that transports a heavy workpiece, and the transport device includes a traveling unit and a transport base. In the traveling unit, two wheels are arranged in parallel at a predetermined interval in a direction orthogonal to the traveling direction. On the other hand, the travel unit is connected to a transport table on which a work is placed, and the work is heavy, and is not placed directly on the transport table, but an air bag is interposed between them. The airbag function is demonstrated by this airbag.

  In the transport apparatus of Patent Document 2, the travel unit connected to the transport base can swing in a direction orthogonal to the travel direction of the vehicle between the transport base and the travel unit connected thereto. As a result, even if the traveling surface of the vehicle has an inclination, the carriage can be kept horizontal by tilting the traveling unit following the inclination, thereby causing uneven wear of wheels and axles, etc. The occurrence of this is suppressed, and the life of the entire conveying device is extended.

JP 2005-227198 A JP 2011-79423 A

  In Patent Document 2, when there is a long and large workpiece having a large weight, a plurality of conveying means composed of traveling units connected to a conveying table are connected, and for example, the traveling units of four conveying means are connected by a connecting mechanism. As a result, the large work is placed across the transport table of each traveling unit. In this case, in order to convey the workpiece smoothly in a stable state and to prevent an uneven load from acting on each component part such as a wheel and an axle, it is necessary to equalize the load on each conveyance table.

  If the workpiece is simply conveyed, the load on each conveyance table can be equalized depending on the position and orientation of the workpiece in each conveyance means, but it is used in the process of assembling various members and parts to the workpiece. In this case, the position of the center of gravity of the workpiece changes according to the flow of the process. For this reason, it is necessary to adjust the load on each conveyance table according to the change of the position of the center of gravity.

  The air pallet is intended to reduce the load on the transport table due to the weight of the work carried on the transport platform. To reduce the weight of the air pallet, If the contact pressure of the wheel is lowered and the contact pressure of the wheel is changed, the transfer of the workpiece is hindered, and there is a possibility that the stable transfer cannot be performed.

  The present invention has been made in view of the above points. The purpose of the present invention is to transport a heavy workpiece to a process such as assembling various members or parts to the workpiece. It is possible to adjust the load on each transfer table so that it is in an appropriate state even when there is weight or center of gravity movement for each assembly, so that the workpiece can be transferred stably There is to do.

  In order to achieve the above-described object, the present invention includes a traveling unit in which a plurality of traveling carriages each composed of a plurality of wheels that roll on a transportation path surface of a transportation path and a driving unit thereof are arranged in the workpiece conveyance direction; It comprises a plurality of pedestal members provided to disperse and place the work in a plurality of parts, and a connecting portion structure to which each of the traveling carriages and each of the pedestal members are connected. Each pedestal member is provided with an air pallet so that the contact pressure of each wheel with respect to the conveyance road surface can be adjusted, and the traveling unit is connected to the connecting portion structure via an attachment member. The traveling carriage that is connected to the traveling unit and that constitutes the traveling unit is configured to include a pushing operation member that is capable of swinging with respect to the coupling unit structure and that presses the wheels against the conveyance road surface. about It is an its features.

  A production / assembly line composed of a plurality of processes is set in order to assemble various members and parts on the workpiece and to perform various processes. In order to move the workpiece along the manufacturing / assembly line, a self-propelled workpiece transfer device is used. The shape of the work is arbitrary, and the pedestal member on which the work is placed is placed by dispersing a plurality of parts of the work, and an appropriate number is placed at an appropriate position according to the shape of the work. Provide. In the case where the whole is of a substantially rectangular shape, four pedestal members are provided to support at least the vicinity of the four corners. When the work is long, one or two pedestal members can be further provided in the middle. When the workpiece is circular, at least three pedestal members are provided. The work may be brought into direct contact with the pedestal member, but may be placed in a state separated from the surface of the pedestal member by providing a work placement post. In order to hold the workpiece in a stable state, an appropriate workpiece fixing means such as a clamping means can be provided. However, when the stability of the workpiece is ensured, the base member or the workpiece installation post is provided. Just place it.

  While the work is placed, the work transport device is self-propelled, but since the base member is provided with an air pallet, the weight of the work is extremely heavy, for example, 100 tons or more. Moreover, the load which acts on the workpiece conveyance apparatus at the time of driving | running | working is reduced. Here, the air pallet is for supplying compressed air between the pedestal member and the road surface of the conveyance path to float the pedestal member from the conveyance path surface. And the flying height of a base member can be adjusted according to the pressure and flow volume of the compressed air supplied.

  There are multiple pedestal members, and the weight of the workpiece is distributed and supported by the pedestal members at multiple locations. However, when assembling various members and parts along the production / assembly line, the center of gravity of the workpiece The position may change. Therefore, by controlling the pressure of the compressed air supplied to the air pallet in each pedestal member, and changing the contact pressure to the road surface of each wheel and the conveying path constituting the traveling carriage according to the change of the center of gravity position. In the self-running state, it is possible to suppress the uneven load from acting on each wheel and the axle.

  Although the pedestal member floats from the conveyance path and becomes in a non-contact state by the action of the air pallet, the workpiece conveyance device moves while the wheels constituting the traveling carriage are in contact with the conveyance path surface. In order for the workpiece transfer device to run smoothly in a stable state without causing a slip or the like, an appropriate ground pressure must act on the transfer road surface. In order to enable the adjustment of the ground pressure, the traveling carriage is provided with a ground pressure adjusting unit. Here, the wheels and the driving means thereof in the traveling carriage are unitized by being connected to the base plate, and the adjustment unit for the ground pressure is interposed between the base plate and the member to which the base plate is attached. That is, with respect to the position where the wheels are disposed, either one of the front and rear sides in the workpiece conveyance direction is connected to a mounting member via a universal joint. As a result, the base plate can be tilted. A load receiving member is provided on the other side of the base plate, and a pushing operation member for applying pressure is provided between the load receiving member and the mounting member. Accordingly, the ground pressure of each wheel can be individually adjusted by adjusting the pressure applied by the pushing member. Here, it is desirable to use a compressible air cylinder as the pushing member.

  When the conveyance path in the production / assembly line is a straight line, the workpiece conveyance device moves straight, but when the conveyance path is in a non-linear state, for example, there is a curved portion in the entire conveyance path or in part. When the conveyance path changes in the orthogonal direction, the work conveyance path needs to have a steering property. For this reason, the connection part structure which provided the base member is connected with the traveling trolley which comprises a traveling unit so that rotation is possible in a horizontal direction. Each traveling carriage can be connected to the connecting portion structure via a rotating shaft that can rotate in the horizontal direction. However, if the work is extremely heavy, the turn has an outer race and an inner race. A slewing bearing is interposed between the outer race and the inner race. A ring gear is provided on the inner race, the outer race is connected to a mounting member, a support plate is provided on the inner race, and the other end of the universal joint and pressure member provided on the base plate of the traveling carriage is connected to this support plate. To do.

  The traveling unit is provided with two wheels in a direction perpendicular to the workpiece conveying direction, and driving means for independently rotating these wheels is provided. Thereby, a difference can be given to the rotational speed of each wheel, and the steering function is further improved. And the base member which mounted the air pallet is arrange | positioned at the both right and left sides of a traveling unit with respect to the conveyance direction of a workpiece | work, and a pressurizing member is comprised with an air cylinder, and it arranges two in the direction orthogonal to the conveyance direction of a workpiece | work. With this configuration, the ground contact pressure of each wheel on the road surface can be controlled more finely, and even if there is some unevenness on the road surface, it is possible to get over smoothly and the workpiece is stably held.

  When transporting heavy workpieces, the transport is used in processes such as assembling various members and parts to the workpiece, and even if there is a shift in the center of gravity for each assembly, the center of gravity is easily and quickly The position can be adjusted, and the workpiece can be stably conveyed along the production / assembly line.

It is a top view of the workpiece conveyance apparatus which shows one Embodiment of this invention. It is composition explanatory drawing of the air pallet provided by connecting with a base part. It is a front view of a traveling unit. FIG. 4 is a left side view of FIG. 3. FIG. 4 is a right side view of FIG. 3. FIG. 4 is a bottom view of FIG. 3. It is composition explanatory drawing of a turning apparatus.

    Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, FIG. 1 shows an overall configuration of a workpiece transfer apparatus. In the drawing, 1 is a traveling unit, 2 is a base member, 3 is a connecting portion constituting body, and the workpiece transfer apparatus is The whole travels in the direction of the arrow in FIG. 1, for example. The connecting portion structure 3 includes a front structural frame 10a and a rear structural frame 10b each formed in a square frame shape, and a bridging portion 10c that connects the front structural frame 10a and the rear structural frame 10b. It is comprised from the frame structure 10 which consists of. The traveling unit 1 is disposed on the front structural frame 10 a and the rear structural frame 10 b, and pedestal members 2 and 2 are provided on both the left and right sides of the traveling unit 1. In the present embodiment, the pedestal member 2 is arranged at four apex portions of a quadrangle, and the workpiece W is a substantially rectangular frame-shaped member and is supported so as to be distributed to each pedestal member 2. . For this reason, the work placing post 2a is erected on the base member 2, and each part of the work W is placed on the work placing post 2a so as to be stably held. It has become.

  The workpiece W is, for example, a body frame of a large dump truck, and the workpiece W is assembled with various members and parts and subjected to various processing. For this purpose, the production / assembly line is provided with a plurality of stages, and assembly is performed sequentially at each stage. Here, the production / assembly line is not necessarily linear, there are bent parts in consideration of the layout, such as the convenience of the building and various equipments arranged in the vicinity, etc. A line may be formed. The workpiece W is not particularly restricted in size and weight, but is extremely large, for example, several tens of meters, and is extremely heavy such as 100 tons or more.

  In order to convey such a heavy object, the base member 2 as a support member is provided with an air pallet 4 shown in FIG. The air pallet 4 includes an annular airbag 21 that is fixedly provided on the lower surface of the base plate 20 that is connected to the lower position of the pedestal member 2, and a spacer member at the center of the lower surface of the base plate 20. 22 is fixed to the base plate 20. Further, an air chamber 23 is formed between the annular airbag 21 and the spacer member 22, and an air flow path 24 provided in the base plate 20 is opened in the air chamber 23.

  Normally, the airbag 21 is in a contracted state indicated by a solid line, and the spacer member 20 is in contact with the conveyance path surface 5. The air bag 21 can be floated from the conveyance path surface 5 of the production / assembly line by supplying compressed air to the inside as shown by the phantom line, thereby providing a jack function for raising and lowering the base member 2. Demonstrate. When compressed air is supplied to the air chamber 23 in this state, the pressure of the compressed air acts on the lower surface of the base plate 20 of the air pallet 4 provided at the lower position of the pedestal member 2, and as a result, the pedestal member 2. Reduce the load acting on. Here, although the air chamber 23 is in a closed state, a gap is generated between the airbag 23 and the conveyance path surface 5, and the compressed air is discharged to the outside. Therefore, the load on the base member 2 is reduced according to the pressure of the compressed air supplied to the air chamber 23.

  The base member 2 is provided at four locations, and the airbag 21 is supplied with compressed air having the same pressure almost simultaneously. On the other hand, the compressed air having the same pressure is not necessarily supplied to the air chamber 23, and the supply pressure of the compressed air may be changed according to the weight of each pedestal member 2. In this case, the compressed air supplied to the air flow path 24 in each air pallet 4 can be individually controlled.

  A front projecting portion 13 is provided on the front structural frame 10, and an air piping assembly 15 is provided on the projecting portion 13 together with the power supply unit 14. External piping is detachably connected to the air piping assembly 15, and four branch pipes 15 a are drawn out. These branch pipes 15 a are provided on the base plate 20 of each air pallet 4. It is connected to the air flow path 24. In addition, although air piping is connected also to the airbag 21, illustration and description are abbreviate | omitted about this air piping.

  The power supply unit 14 is for supplying power for driving the traveling unit 1 to be described later. Further, the base member 2 provided at four places is provided with the air pallet 4 shown in FIG. 2 at the lower position thereof, and these air pallets 4 are supplied from the compressed air / air piping assembly 15. It has become. For this purpose, an air pipe 15a is individually connected to the air pallet 4 of each pedestal member 2.

  The air pallet 4 has an annular air bag 21 fixedly provided on the lower surface of a base plate 20 provided at a lower position of the pedestal member 2, and the air bag 21 supplies a compressed air to the inside thereof to convey the surface of the conveyance path. It is possible to ascend from 5 and demonstrates the jack function. Here, although four air pallets 4 are provided, the four airbags 21 attached to each air pallet 4 are preferably configured to simultaneously contain compressed air of the same pressure.

  The base plate 20 is provided with a spacer member 22 for keeping the airbag 21 away from the conveyance path surface 5 when the airbag 21 is in a contracted state. A predetermined air chamber 23 is formed between the periphery of the spacer member 22 and the inner peripheral portion of the airbag 21. The air pipe 15 a is connected to an air flow path 24 provided by being drilled in the base plate 20, and the tip of the air flow path 24 opens into the space 23. As a result, when compressed air is supplied from the air flow path 24 into the space 23, the base plate 20 is lifted by the pressure. As a result, the entire pedestal member 2 floats from the road surface 5 or acts on the pedestal member 2. Gravity will be reduced. A workpiece placement post 2 a with which each part of the workpiece W engages is provided on the upper surface of the base plate 20.

  As shown in FIGS. 3 to 6, the traveling unit 1 is disposed at a position between the pedestal members 2, 2 on the left and right sides of the connecting portion structure 3, and the frame portion constituting the connecting portion structure 3. It has the top plate part 30 fixed to 3a. A swivel device 31 is connected to the lower surface of the top plate 30.

  As shown in FIG. 7, the turning device 31 includes an outer race 31a and an inner race 31b each formed of an annular member, and a turning bearing 31c interposed between the outer race 31a and the inner race 31b. An outer race 31 a is fixed to the top plate portion 30. In the illustrated example, a ring gear 32 is formed on the inner peripheral surface of the inner race 31b, and the output shaft of the pinion motor 34 supported by a mounting member 33 provided by connecting the ring gear 32 to the top plate 30. The pinion 35 provided in the is engaged. Then, the turning plate 36 is fixed to the inner race 31b, so that when the turning device 31 is operated, the inner race 31b rotates following the rotation of the inner race 31b.

  A traveling carriage 40 is provided on the lower surface of the turning plate 36 connected to the inner race 31b. The traveling carriage 40 has a base plate 41, and as is apparent from FIG. 6, a pair of left and right wheels 42, 42 are attached to the base plate 41, and by rotating these wheels 42, The traveling carriage 40 can travel on the conveyance road surface 5. These two wheels 42 are rotationally driven independently, and for this purpose, the base plate 41 is fixedly provided with a pair of drive means including an electric motor 43 and a transmission 44. Therefore, when both wheels 42 are rotationally driven in the same direction at the same speed at the same time, the traveling carriage 40 travels linearly, and when both wheels 42 are driven to have a difference in rotational speed, the steering function is exhibited. . Further, since the traveling carriage 40 is connected to the inner race 31b of the turning device 31 via the turning plate 36, the traveling carriage 40 is rotated in the horizontal direction around the turning center of the turning device 31. Therefore, by controlling the turning devices 31 provided at the front and rear and controlling the rotation of the pair of wheels 42 provided at the front and rear traveling carriages 40, the workpiece transfer device can be transferred in an arbitrary direction.

  As described above, the traveling carriage 40 is connected to the inner race 31b of the turning device 31, but is not rigidly connected but can swing. That is, the swivel plate 36 and the base plate 41 are connected via a universal joint 45 constituting a universal joint, and the connecting portion of the base plate 41 to the universal joint 45 is biased toward one end side. On the other hand, a pressing member 46 is fixedly provided on the base plate 41 at a position opposite to the connecting portion to the universal joint 45 with the wheel 42 of the base plate 41 interposed therebetween. Two air cylinders 47 are attached to the revolving plate 36 via pins 47a at different positions in the direction in which the pair of wheels 42 are arranged, and the other ends of these air cylinders 47 are members for pushing operation. 46 is fixed.

  In the traveling carriage 40, only the wheels 42 are grounded. However, since the electric motor 43 and the transmission 44 are arranged on the side connected to the universal joint 45 around the grounding portion, the base plate 41 is connected to the universal joint 45. It will incline so that the connection side may become downward. By providing the pushing member 46 in the opposite direction and causing the air cylinder 47 to act on the pushing member 46, the posture of the pushing member 46 can be changed. A distance sensor 48 is provided at the attachment portion of the air cylinder 47 of the turning plate 36, and the distance from the turning plate 36 to the pressing member 46 is measured by the distance sensor 48, and based on the measured distance of the distance sensor 48. Then, the posture of the pushing operation member 46 connected to the wheel 42 is detected, the air cylinder 47 is operated, and the installation pressure of the wheel 42 is controlled with respect to the conveying path surface 5.

  The present embodiment is configured as described above, and the work transfer device is arranged at a predetermined position so that the required places are brought into contact with the work placement posts 2a provided at four places. The work W is placed. Here, the placement of the workpiece W on the workpiece transfer device can be performed using, for example, an overhead crane.

  When the work transfer device is not operated, compressed air is not supplied to the airbag 21. Therefore, the spacer member 22 of the air pallet 4 provided on each pedestal member 2 is in contact with the conveyance path surface 5. And when the workpiece | work W is mounted, the base plate 20 will be floated and jacked up by sending compressed air into the airbag 21. FIG. Here, the flying height of the base plate 20 is set such that the spacer member 22 is sufficiently spaced from the conveyance path surface 5. The pedestal member 2 is provided at four locations, and the pressure of the compressed air to the airbag 21 provided at the site of each pedestal member 2 individually controls the amount of floating.

  From this state, compressed air is supplied to each air flow path 24 in the air plate 20. As a result, the air pressure inside the air chamber 23 increases, and the base plate 22 is pushed up. When the base plate 22 is pushed up to a certain extent, the lower surface of the airbag 21 is separated from the conveyance path surface 5, and compressed air is discharged to the outside. Therefore, if the pressure of the compressed air is maintained, the base member 2 connected to the base plate 22 is lifted, and the load of the workpiece W acting on the conveyance path surface 5 is reduced.

  In this state, the electric motor 43 provided on the traveling carriage 40 is driven to rotate the wheels 42, so that the workpiece conveying device starts to travel. Then, when the workpiece transfer device is transferred to a predetermined stage, the workpiece transfer device is stopped by stopping the rotation of the wheel 42, and the work on the workpiece W can be performed.

  Here, there are cases where the special weight does not change on the work W, such as welding or processing, and when the work W weight increases and the position of the center of gravity changes because various members and parts are assembled. is there. For example, when the unit of the operator's cab is assembled to the workpiece W, in FIG. 1, the unit is installed at the front part in the transport direction, so that the front part becomes heavy. Moreover, since the cab is located on the left side, the position of the center of gravity is shifted. Thus, if conveyance is continued while the weight balance is lost, an uneven load acts on the four wheels 42 provided on the traveling carriage 40, the transmission 44 on the wheels 42, and the like, and the load increases. There is a risk of hindering the conveyance of the workpiece W, such as an increase in the load of 43.

  Therefore, when the weight and weight balance of the workpiece W change, it can be corrected. First, when the weight changes due to assembly of members and parts, the pressure of compressed air to the air chamber 23 in the base plate 20 is increased. As a result, it is possible to prevent an increase in the load acting on the traveling unit 1, and it is possible to carry with a proper driving force.

  When the weight balance changes, for example, when the cab is assembled to the workpiece W as described above, and the left side portion in front of the transport direction becomes heavy, the air pallet 4 in the base member 2 provided at this portion. The pressure of the compressed air to the air chamber 23 is increased. As a result, the height of the base plate 20 sunk due to the increase in weight is restored. However, the ground contact pressure of the wheel 42 may change. Therefore, the pressure in the air cylinder 47 can be adjusted, and the heights of the four base members 2 can be maintained appropriately. Since the swivel plate 36 is provided with the distance sensor 48, the installation pressure on the conveyance road surface 5 can be made appropriate by accurately detecting the posture of the pushing operation member 46 by the distance sensor 48.

  Further, when there are irregularities or protrusions on the conveyance path surface 5, if the difference in height is very small, the air in the air cylinder 47 can be overcome by being compressed. Further, even if the ride over is not performed smoothly, the height difference can be overcome by performing a slight exhaust from the air cylinder 47.

  Steering is not performed when the workpiece W is conveyed linearly by the air conveying device, but the steering function is used when the conveying direction is bent or curved conveying is performed. can do.

  When transporting in an oblique direction having a predetermined angle with respect to the linear transport direction, the rotational speeds of the left and right wheels 42, 42 constituting the front and rear traveling units 1, 1 are made different. As a result, the base plate 41 in the traveling carriage 40 faces in an oblique direction, and the directionality in the transport direction changes. Further, when one of the left and right wheels 42, 42 is moved forward and the other is moved backward, and the turning device 31 is driven to turn the entire traveling vehicle 40, the entire traveling vehicle 40 rotates around the axis of the turning device 31. As a result, the traveling carriage 40 can be directed in a direction orthogonal to the conveyance direction as well as moving in an oblique direction. As a result, the entire workpiece conveyance device can be advanced in the lateral direction. Therefore, for example, operations such as moving the work transfer device from one building to another can be performed smoothly.

  In addition, since the turning device 31 is provided with a turning bearing 31c between the outer race 31a and the inner race 31b, and the turning radius can be increased, a heavy workpiece W of 100 tons or more is placed thereon. Also, the turning can be performed smoothly.

DESCRIPTION OF SYMBOLS 1 Traveling unit 2 Base member 3 Connection part structure 4 Air pallet 5 Carrying path surface 20 Base plate 21 Air bag 23 Air chamber 24 Air flow path 30 Top plate part 31 Turning apparatus 31a Outer race 31b Inner race 35 Pinion 36 Turning plate 40 Running carriage 41 Base plate 42 Wheel 45 Universal joint 46 Pushing member 47 Air cylinder 48 Distance sensor W Workpiece

Claims (4)

A traveling unit in which a plurality of traveling carriages composed of a plurality of wheels that roll on the conveyance path surface of the conveyance path and its driving means are arranged in the conveyance direction of the workpiece;
A plurality of pedestal members provided to disperse and place the work in a plurality of parts;
Each of the traveling carriages and the pedestal members are connected to each other.
The pedestal member is fixed to the connecting portion constituting body, and each pedestal member is provided with an air pallet, and the ground pressure with respect to the conveyance road surface of each wheel can be adjusted.
The traveling carriage constituting the traveling unit is configured to be capable of swinging with respect to a connecting portion constituting body, and includes a pushing operation member that presses the wheels against the conveyance path surface. Work transport cart.   2. The work conveyance carriage according to claim 1, wherein the work conveyance carriage comprises an outer race and an inner race having a ring gear connected via a swing bearing between the mounting member and the traveling carriage.   In the traveling carriage, the inner race and the universal joint are connected to one of the front and rear sides of the workpiece conveying direction around the position where the wheels are arranged, and a load receiving member is provided on the other side. The work conveying carriage according to claim 2, wherein the pressurizing member comprises an air cylinder provided between the load receiving member and the inner race.   The traveling carriage has a pair of wheels on the left and right with respect to the workpiece conveying direction. The traveling carriage is provided at two positions on the front and rear sides, and a base member having the air pallet mounted on the left and right sides of the traveling carriage is provided. 4. The work conveyance carriage according to claim 2, wherein each of the air cylinders is arranged and two air cylinders are arranged in a direction orthogonal to a conveyance direction of the work W.

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