A trolley equipped with an automatic positioning device

Abstract

This invention discloses a trolley equipped with an automatic positioning device, comprising a base, a housing, a loading tray, a feeder mounting base, a movable lifting platform, and a positioning and locking device. The movable lifting platform and the loading tray are both mounted on the base. The movable lifting platform is used for lateral and vertical driving of the feeder mounting base. The positioning and locking device includes a positioning and locking mating part and a positioning and locking driving part. Two sets of the positioning and locking device are provided, located on opposite sides of the housing. The positioning and locking mating part located on the side of the trolley cooperates with the positioning and locking driving part located on the main body of the pick-and-place machine. Utilizing the automatic guiding, positioning, and locking device cooperation, and the vertically and laterally adjustable movable lifting platform, the automatic positioning and locking process between the trolley and the main body of the pick-and-place machine is achieved. This avoids unnecessary manual operation, making the docking and installation process between the trolley and the main body of the pick-and-place machine more accurate and efficient.

Description

Technical Field

[0001] This invention relates to a chip mounter trolley, and more particularly to a trolley equipped with an automatic positioning device. Background Technology

[0002] With advancements in production technology, production equipment is becoming increasingly intelligent and efficient. Pick-and-place machines, used for batch processing of parts, typically consist of a feeder, a placement head, and a drive mechanism to move the placement head. To further improve the production efficiency of pick-and-place machines, the placement head can handle different sizes and styles of components while also increasing placement efficiency. However, existing feeders are generally fixed to the pick-and-place machine, making component replacement cumbersome and difficult to adapt to different placement parts. Some existing technologies utilize detachable trolleys for feeding, but these trolleys are manually operated, requiring manual positioning and installation between the trolley and the machine body. This positioning process is not precise enough and is time-consuming and labor-intensive. Summary of the Invention

[0003] In order to overcome the shortcomings of the prior art, the present invention provides a trolley that achieves automatic positioning and installation of the trolley and the main body of the chip mounter through the cooperation of an automatic movable lifting platform and a positioning and locking device.

[0004] The technical solution adopted by this invention to solve its technical problem is as follows: a trolley equipped with an automatic positioning device includes a base, a housing, a feeding tray, a feeder mounting base, a movable lifting platform, and a positioning locking device. The movable lifting platform and the feeding tray are both mounted on the base. The movable lifting platform is used to drive the feeder mounting base horizontally and vertically. The positioning locking device includes a positioning locking mating part mounted on the housing and a positioning locking drive part that mats with it. The positioning locking drive part and the positioning locking mating part cooperate with each other to realize the automatic positioning and installation of the trolley and the main body of the equipment. There are two sets of positioning locking devices, located on both sides of the housing.

[0005] As an improvement to the above technical solution, the base includes a sliding support frame with a wheel axle, a vertical support frame vertically arranged above the sliding support frame, and a horizontal support frame supported by the vertical support frame. The support frame is also equipped with a manual push rod, which is located diagonally above the feeding tray and is used to manually push the trolley.

[0006] As a further improvement to the above technical solution, the movable lifting platform includes a feeder support frame, a support frame drive plate, and a horizontal pushing cylinder and a vertical pushing cylinder for driving the support frame drive plate. The support frame drive plate is used to install the feeder support frame.

[0007] As a further improvement to the above technical solution, the vertical push cylinder is fixedly installed on the horizontal support frame, the support frame drive plate is fixed to the end of the vertical push cylinder rod, and is driven to move up and down by the vertical push cylinder; there are two vertical push cylinders, which are located on both sides of the horizontal support frame respectively, and a horizontal push cylinder is also provided in the middle of the horizontal support frame, and the rod of the horizontal push cylinder is fixed on the feeder support frame.

[0008] As a further improvement to the above technical solution, the support frame drive plate is also provided with a movable mounting hole, in which a movable screw and a nut that cooperate with the movable screw are provided. The feeder support frame is in clearance fit with the movable mounting hole through the movable screw. An elastic washer is also provided at the position where the movable screw and the movable mounting hole cooperate. The movable screw is fixed to the support frame drive plate through the elastic washer and the nut.

[0009] As a further improvement to the above technical solution, the positioning and locking drive part includes a horizontal guide block, a positioning pin, a locking block, and a drive device for the positioning pin and locking the positioning block; the horizontal guide block is disposed at the end of the positioning and locking drive part, and the edge of the horizontal guide block is provided with a horizontal guide post at the top, a guide groove on the lower side of the horizontal guide post, and a positioning wheel shaft fixed in the middle, and the edge of the guide groove is arc-shaped; the drive device includes a drive cylinder, a drive connecting block, and a return spring, and the drive cylinder cooperates with the drive connecting block to realize the synchronous movement of the locking block and the positioning pin.

[0010] As a further improvement to the above technical solution, the positioning and locking engagement part includes a positioning block and a guide wheel shaft located on the positioning block. There are two guide wheel shafts, which are vertically and correspondingly arranged at the upper end of the positioning block. The end of the positioning block is also provided with a reverse positioning groove that cooperates with the positioning wheel shaft. The guide wheel shaft cooperates with the horizontal guide post and is arranged on the positioning and locking engagement part at a position parallel to both sides of the horizontal guide post.

[0011] As a further improvement to the above technical solution, a limiting screw is also provided in the guide groove, and the limiting screw can be adjusted; the positioning pin is set on the arc-shaped edge of the horizontal guide block and moves into the guide groove along the arc-shaped edge; the locking block is set on the side of the positioning pin and slides arc-shaped synchronously with the positioning pin on the side of the positioning pin; the end of the locking block is provided with a locking groove, which is used to lock the guide wheel shaft set on the positioning and locking mating part.

[0012] As a further improvement to the above technical solution, the positioning and locking drive part further includes a limit seat and a protective guide wheel. The limit seat is located at the upper part of the first end of the locking drive part. The protective guide wheel includes an upper edge guide wheel located on the upper side of the limit seat and a lower edge guide wheel located at the bottom of the main body of the equipment. The upper edge guide wheel contacts the upper edge of the trolley to guide the upper edge of the trolley, and the lower edge guide wheel contacts the lower edge of the trolley to guide the lower edge of the trolley. The upper end of the positioning and locking mating part is provided with a limit block that mates with the limit seat.

[0013] As a further improvement to the above technical solution, the positioning and locking drive part further includes a balance limit block. The balance limit block is located at the tail end of the positioning and locking part, and a balance slider is provided at the tail end of the positioning and locking mating part corresponding to the balance limit block. The balance slider includes a limit frame and a pulley provided at the bottom of the limit frame. The balance limit block is trapezoidal, and the pulley at the bottom of the balance slider slides to the top of the balance limit block through the inclined side of the balance limit block to achieve the lifting and balancing of the balance slider.

[0014] The beneficial effects of this invention are as follows: the positioning and locking device mating part located on the side of the trolley cooperates with the positioning and locking device drive part located on the main body of the pick-and-place machine. Utilizing the automatic guiding, positioning, and locking device coordination, along with a movable lifting platform that can be adjusted vertically and horizontally, the automatic positioning and locking process between the trolley and the main body of the pick-and-place machine is achieved. This avoids unnecessary manual operation, making the docking and installation process between the trolley and the main body of the pick-and-place machine more accurate and efficient. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the overall structure of the trolley in the working state of the present invention;

[0017] Figure 2 This is a schematic diagram of the overall structure of the practical trolley in its separated state;

[0018] Figure 3 This is a schematic diagram of the main body of the trolley in the explosion state of the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of the movable lifting platform of the present invention;

[0020] Figure 5 This is a schematic diagram of the disassembled state of the base and the movable lifting platform of the present invention;

[0021] Figure 6 This is a schematic diagram of the upper part of the movable lifting platform of the present invention;

[0022] Figure 7This is a schematic diagram of the installation state of the positioning and locking device of the present invention;

[0023] Figure 8 This is a schematic diagram of the positioning and locking drive part of the present invention;

[0024] Figure 9 This is a schematic diagram of the positioning and locking mechanism of the present invention.

[0025] 1. Positioning and locking drive part; 11. Horizontal guide block; 111. Horizontal guide post; 112. Guide groove; 12. Limit screw; 13. Positioning wheel shaft; 14. Positioning pin shaft; 15. Locking block; 151. Locking slot; 16. Limiting seat; 17. Protective guide wheel; 18. Balance limit block;

[0026] 2. Positioning and locking mating parts; 21. Positioning block; 22. Guide wheel shaft; 23. Reverse positioning groove; 24. Limiting block; 25. Balance slider;

[0027] 3. Drive unit; 31. Drive cylinder; 32. Drive connecting block; 33. Return spring;

[0028] 4. Movable lifting platform; 41. Feeder support frame; 42. Support frame drive plate; 43. Horizontal push cylinder; 44. Vertical push cylinder; 45. Movable mounting hole; 46. Movable screw; 47. Elastic washer;

[0029] 5. Base; 51. Sliding support frame; 52. Vertical support frame; 53. Horizontal support frame; 54. Manual push rod;

[0030] 6. Housing; 7. Feeding tray; 8. Feeder mounting base. Detailed Implementation

[0031] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0032] Reference Figure 1 , Figure 2A trolley equipped with an automatic positioning device includes a base 5, a housing 6, a feeding tray 7, a feeder mounting base 8, a movable lifting platform 4, and a positioning locking device. The movable lifting platform 4 and the feeding tray 7 are both mounted on the base 5. The movable lifting platform 4 is used to drive the feeder mounting base 8 horizontally and vertically. The positioning locking device includes a positioning locking engagement part 2 mounted on the housing 6 and a cooperating positioning locking drive part 1. The positioning locking drive part 1 and the positioning locking engagement part 2 cooperate to achieve automatic positioning and installation of the trolley and the main body of the equipment. Two sets of positioning locking devices are provided, located on opposite sides of the housing 6. When positioning and installing the trolley with the pick-and-place machine body is required, the trolley is first pushed close to the installation position on the pick-and-place machine. At this time, the positioning locking drive parts 1 located on both sides of the pick-and-place machine are activated. The positioning locking drive parts 1 on both sides cooperate with the positioning locking engagement parts 2 located on both sides of the trolley to move the trolley to the appropriate installation position and lock the trolley in place. When the positioning and locking mating part 2 is used in conjunction with the positioning and locking drive part 1 for positioning and installation, the movable lifting platform 4 set inside the trolley is started at the same time. In conjunction with the movement of the positioning and locking drive part 1, the upper part of the trolley is adjusted when the trolley needs to be moved and adjusted, so as to realize the automatic, accurate and efficient installation process between the trolley and the main body of the chip mounter.

[0033] The base 5 includes a sliding support frame 51 with axles, a vertical support frame 52 vertically positioned above the sliding support frame 51, and a horizontal support frame 53 supported by the vertical support frame 52. The sliding support frame 51 forms a quadrilateral frame at the bottom of the trolley, with axles at each of the four corners, allowing for easy sliding of the trolley. The vertical support frame 52 and the horizontal support frame 53, based on the sliding support frame 51, increase the overall height of the movable lifting platform 4 and the feeder, making it easier for the feeding feeder to adapt to the overall height of the pick-and-place machine. A manual push rod 54 is also provided on the support frame, located diagonally above the feeding tray 7. The manual push rod 54 is used to manually push the trolley. When the trolley is far from the main body of the pick-and-place machine, the automated positioning and locking device cannot pull the trolley. Therefore, when the trolley is far from the main body of the pick-and-place machine, it is necessary to manually push the manual push rod 54 on the trolley to the position where the drive part and the mating part of the positioning and locking device contact.

[0034] Once the trolley is pushed to the appropriate position on the main body of the placement machine, the positioning and locking device is activated. Since the positioning and locking device is located on the upper part of the trolley, when it performs positioning and locking, it only moves the upper part of the trolley. The movable lifting platform 4, located inside the trolley, is used to coordinate the movement of the upper part of the trolley. The movable lifting platform 4 includes a feeder support frame 41, a support frame drive plate 42, and a horizontal pushing cylinder 43 and a vertical pushing cylinder 44 for driving the support frame drive plate 42. The support frame drive plate 42 is used to mount the feeder support frame 41.

[0035] The vertical push cylinder 44 is fixedly mounted on the horizontal support frame 53. The support frame drive plate 42 is fixed to the end of the cylinder rod of the vertical push cylinder 44 and is driven by the vertical push cylinder 44 to move up and down. The support frame drive plate 42 is fixedly mounted to the end of the cylinder rod of the vertical push cylinder 44. The vertical movement of the support frame drive plate 42 can be directly controlled by the extension and retraction of the cylinder rod of the vertically mounted vertical push cylinder 44, thereby realizing the vertical movement of the feeder support frame 41. There are two vertical push cylinders 44, located on both sides of the horizontal support frame 53. The vertical push cylinders 44 located on both sides of the horizontal support frame 53 increase the supporting force of the vertical push cylinders 44 on the support frame drive plate 42, thereby increasing the stability of the feeder support frame 41. Each vertical push cylinder 44 is also equipped with a buffer spring, which is used to buffer the support frame drive plate 42 during the rising and falling process. The feeder support frame 41 is used to install the feeding feeder. The feeding feeder is easily damaged when subjected to a large impact during its movement. Therefore, a buffer spring is set on the outer periphery of the air rod of the vertical push cylinder 44 to reduce the impact force generated by the air rod during the movement and achieve stable adjustment of the feeder support frame 41 and the feeder.

[0036] A transverse pushing cylinder 43 is also provided in the middle of the transverse support frame 53, and the cylinder rod of the transverse pushing cylinder 43 is fixed to the feeder support frame 41. The support frame drive plate 42 is also provided with a movable mounting hole 45, in which a movable screw 46 and a nut that mates with the movable screw 46 are provided. The feeder support frame 41 is clearance-fitted with the movable screw 46 in the movable mounting hole 45. An elastic washer 47 is also provided at the mating position of the movable screw 46 and the movable mounting hole 45. The movable screw 46 is fixed to the support frame drive plate 42 by the elastic washer 47 and the nut. When the transverse pushing cylinder 43 pushes the feeder support frame 41 to move laterally, the movable screw 46, which is fixedly connected to the feeder support frame 41, moves laterally accordingly. The movable screw 46 compresses the elastic washer 47 in the movable mounting hole 45. The high elasticity of the elastic washer 47 enables the transverse movement of the feeder support frame 41 and the movable screw 46 while ensuring the proper fit between the movable screw 46 and the movable mounting hole 45. The mobile structure is simple and ingenious, with low production costs and high production efficiency.

[0037] The positioning and locking drive part 1 includes a horizontal guide block 11, a positioning pin 14, a locking block 15, and a drive device 3 for positioning pin 14 and locking positioning block 21. The horizontal guide block 11 is disposed at the end of the positioning and locking drive part 1. The edge of the horizontal guide block 11 is provided with a horizontal guide post 111 at the top, a guide groove 112 on the lower side of the horizontal guide post 111, and a positioning wheel shaft 13 fixed in the middle. The edge of the guide groove 112 is arc-shaped. The positioning and locking mating part 2 includes a positioning block 21 and a guide wheel shaft 22 on the positioning block 21. There are two guide wheel shafts 22, which are vertically and correspondingly disposed at the upper end of the positioning block 21. The end of the positioning block 21 is also provided with a reverse positioning groove 23 that mates with the positioning wheel shaft 13. The guide wheel shaft 22 mates with the horizontal guide post 111 and is disposed on the positioning and locking mating part 2 at a position parallel to both sides of the horizontal guide post 111. The guide groove 112 is also provided with a limiting screw 12, which is adjustable; the positioning pin 14 is provided on the arc-shaped edge of the horizontal guide block 11 and moves along the arc-shaped edge into the guide groove 112; the locking block 15 is provided on the side of the positioning pin and slides in an arc shape synchronously with the positioning pin on the side of the positioning pin; the end of the locking block 15 is provided with a locking groove 151, which is used to lock the guide wheel shaft 22 provided on the positioning and locking mating part.

[0038] The driving device 3 includes a driving cylinder 31, a driving connecting block 32, and a return spring 33. The driving cylinder 31 and the driving connecting block 32 cooperate to achieve synchronous movement of the locking block 15 and the positioning pin 14. The driving connecting block 32 includes a first connecting block connected to the cylinder and the locking block 15, and a second connecting block connected to the positioning pin 14 and the return spring 33. The second connecting block is V-shaped. A motion track is also provided at the mounting positions of the locking block 15 and the positioning pin 14. The motion track of the locking block 15 extends from the bottom to the top of the positioning and locking driving part 1 in an arc shape. The track of the positioning pin 14 is located at the middle edge of the horizontal guide block 11, and is also arc-shaped at the middle edge of the horizontal guide block 11. The arc-shaped track of the positioning pin 14 is smaller than that of the locking block 15. The air rod of the driving cylinder 31 is directly connected to the locking block 15, pushing the locking block 15 to move along its track. Meanwhile, a first connecting block is also connected to the locking block 15. The first connecting block connects the locking block 15 to the positioning pin 14. A second connecting block is also connected to the positioning pin 14. The two connecting blocks and the cylinder rod form a linkage structure. The movement of the positioning pin 14 is achieved by the extension and retraction of the cylinder rod.

[0039] The movement process of the positioning and locking device is as follows: when the positioning and locking mating part 2 moves with the trolley to the position of the positioning and locking drive part 1, it continues to move towards the positioning and locking drive part 1 until the positioning block 21 on the positioning and locking mating part 2 reaches the position of the horizontal guide block 11 on the positioning and locking drive part 1. The two guide wheel shafts 22 on the positioning block 21 contact the horizontal guide post 111 at the upper edge of the horizontal guide block 11. The horizontal guide post 111 is inserted between the two guide wheel shafts 22, restricting the movement path of the two guide wheel shafts 22 to the position of the horizontal guide post 111, thereby restricting the movement direction of the positioning and locking drive part 1 and realizing the guidance of the positioning and locking drive part 1. After the horizontal guide post 111 on the horizontal guide block 11 engages with the guide wheel shaft 22 on the positioning block 21, the positioning pin 14 located at the edge of the horizontal guide block 11 moves along the arc-shaped edge of the horizontal guide block 11 under the drive of the drive cylinder 31 and the drive connecting block 32 until the positioning pin 14 moves to the side of the positioning block 21, contacts the positioning block 21, and pushes the positioning block 21 forward. When the positioning block 21 moves in the guide groove 112 and contacts the top of the limit screw 12, it stops moving, completing the positioning process of the positioning and locking part. At the same time, the locking block 15 located outside the positioning pin 14 moves synchronously with the positioning pin 14 to the position of the positioning block 21. The locking groove 151 at the end of the locking block 15 contacts the guide wheel shaft 22 on the positioning block 21, and then engages with the outside of the guide wheel shaft 22 located above. The connection between the positioning and locking engagement part 2 and the positioning and locking drive part 1 is reversed to prevent the positioning and locking engagement part 2 from moving in the opposite direction when subjected to external force, thus disengaging from the connection with the positioning and locking drive part 1.

[0040] The positioning and locking drive part 1 also includes a limiting seat 16 and a protective guide wheel 17. The limiting seat 16 is located at the upper part of the first end of the locking drive part. Since the trolley will move between its upper and lower halves during operation, the protective guide wheel 17 includes an upper edge guide wheel located on the upper side of the limiting seat 16 and a lower edge guide wheel located at the bottom of the main body of the equipment. The upper edge guide wheel contacts the upper edge of the trolley to guide the upper edge of the trolley, and the lower edge guide wheel contacts the lower edge of the trolley to guide the lower edge of the trolley. The upper end of the positioning and locking engagement part 2 is correspondingly provided with a limiting block 24 that cooperates with the limiting seat 16. During the forward movement of the positioning and locking engagement part 2 driven by the positioning and locking drive part 1, the limiting seat 16 gradually contacts the limiting block 24 provided on the positioning and locking engagement part 2, and then engages with the outside of the limiting block 24. The positioning and locking engagement part 2 stops moving, and the connection between the positioning and locking device drive part and the positioning and locking engagement part 2 is completed. The setting of the limit card holder 16 further limits the connection process between the positioning and locking mating part 2 and the positioning and locking drive part 1, and enhances the stability of the connection process between the two.

[0041] Due to the large size of the trolley, and the positioning and locking device being located near the front end of the trolley, to ensure the balance and stability of the rear end and the front end during installation, the positioning and locking drive part 1 further includes a balance limit block 18. The balance limit block 18 is located at the rear end of the positioning and locking part, and a balance slider 25 is provided at the rear end of the positioning and locking mating part 2 corresponding to the balance limit block 18. The balance slider 25 includes a limit frame and a pulley located at the bottom of the limit frame. The balance limit block 18 is trapezoidal in shape, and the pulley at the bottom of the balance slider 25 slides to the top of the balance limit block 18 via its inclined side, thus achieving the lifting and balance of the balance slider 25. The balance limit block 18 supports the balance slider 25, thereby supporting the rear position of the trolley and achieving balance and stability between the front and rear positions of the trolley. The positioning and locking drive part 1 is also provided with a protective guide wheel 17. The protective guide wheel 17 is located at the upper part of the first end of the positioning and locking drive part 1. The protective guide wheel 17 is used to guide the positioning and locking mating part 2 when it slides.

[0042] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. A trolley equipped with an automatic positioning device, characterized in that: The device includes a base, a housing, a feeding tray, a feeder mounting base, a movable lifting platform, and a positioning and locking device. Both the movable lifting platform and the feeding tray are mounted on the base. The movable lifting platform is used to drive the feeder mounting base horizontally and vertically. The positioning and locking device includes a positioning and locking mating part mounted on the housing and a mating and locking driving part that cooperates with it. The positioning and locking driving part and the positioning and locking mating part work together to achieve automatic positioning and installation of the trolley and the main body of the equipment. Two sets of the positioning and locking device are provided, located on opposite sides of the housing. The positioning and locking drive part includes a horizontal guide block, a positioning pin, a locking block, and a drive device for the positioning pin and locking the positioning block. The horizontal guide block is located at the end of the positioning and locking drive part. The edge of the horizontal guide block is provided with a horizontal guide post at the top, a guide groove on the lower side of the horizontal guide post, and a positioning wheel shaft fixed in the middle. The edge of the guide groove is arc-shaped. The drive device includes a drive cylinder, a drive connecting block, and a return spring. The drive cylinder cooperates with the drive connecting block to realize the synchronous movement of the locking block and the positioning pin. The positioning and locking engagement part includes a positioning block and a guide wheel shaft located on the positioning block. There are two guide wheel shafts, which are vertically and correspondingly arranged at the upper end of the positioning block. The end of the positioning block is also provided with a reverse positioning groove that cooperates with the positioning wheel shaft. The guide wheel shaft cooperates with a horizontal guide post and is arranged on the positioning and locking engagement part at a position parallel to both sides of the horizontal guide post. The guide groove is also provided with a limiting screw, which is adjustable; the positioning pin is set on the arc-shaped edge of the horizontal guide block and moves along the arc-shaped edge into the guide groove; the locking block is set on the side of the positioning pin and slides in an arc shape synchronously with the positioning pin on the side of the positioning pin; the end of the locking block is provided with a locking groove, which is used to lock the guide wheel shaft set on the positioning and locking mating part; The positioning and locking drive part also includes a limit seat and a protective guide wheel. The limit seat is located at the upper part of the first end of the locking drive part. The protective guide wheel includes an upper edge guide wheel located on the upper side of the limit seat and a lower edge guide wheel located at the bottom of the main body of the equipment. The upper edge guide wheel contacts the upper edge of the trolley to guide the upper edge of the trolley. The lower edge guide wheel contacts the lower edge of the trolley to guide the lower edge of the trolley. The upper end of the positioning and locking mating part is provided with a limit block that mates with the limit seat. The positioning and locking drive part also includes a balance limit block, which is located at the tail end of the positioning and locking part. A balance slider is provided at the tail end of the positioning and locking part corresponding to the balance limit block. The balance slider includes a limit frame and a pulley provided at the bottom of the limit frame. The balance limit block is trapezoidal. The pulley at the bottom of the balance slider slides to the top of the balance limit block through the inclined side of the balance limit block to achieve the lifting and balancing of the balance slider.

2. The trolley equipped with an automatic positioning device according to claim 1, characterized in that: The base includes a sliding support frame with a wheel axle, a vertical support frame vertically arranged above the sliding support frame, and a horizontal support frame supported by the vertical support frame. The support frame is also equipped with a manual push rod, which is located diagonally above the feeding tray and is used to manually push the trolley.

3. The trolley equipped with an automatic positioning device according to claim 2, characterized in that: The movable lifting platform includes a feeder support frame, a support frame drive plate, and a horizontal pushing cylinder and a vertical pushing cylinder for driving the support frame drive plate. The support frame drive plate is used to install the feeder support frame.

4. A trolley equipped with an automatic positioning device according to claim 3, characterized in that: The vertical push cylinder is fixedly installed on the horizontal support frame. The support frame drive plate is fixed to the end of the vertical push cylinder rod and is driven to move up and down by the vertical push cylinder. There are two vertical push cylinders, located on both sides of the horizontal support frame. A horizontal push cylinder is also provided in the middle of the horizontal support frame. The rod of the horizontal push cylinder is fixed on the feeder support frame.

5. A trolley equipped with an automatic positioning device according to claim 3, characterized in that: The support frame drive plate is also provided with a movable mounting hole, in which a movable screw and a nut that mates with the movable screw are provided. The feeder support frame is fitted with the movable screw in the movable mounting hole with a clearance. An elastic washer is also provided at the mating position between the movable screw and the movable mounting hole. The movable screw is fixed to the support frame drive plate by the elastic washer and the nut.

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