Automatic recovery mechanism of trolley seat in automobile assembly workshop

Abstract

The application relates to an automatic recovery mechanism of a trolley seat for an automobile assembly workshop, which is used for installing a front cross beam of an automobile and comprises a trolley structure, a locking mechanism and a seat folding mechanism. The middle of a trolley of the trolley structure is provided with a seat, the upper part of the seat is provided with a trolley drawer, a handle is arranged in the middle of the drawer, an unlocking pulley is arranged on one side of the trolley drawer, and an unlocking pressure rod is arranged on a stand column at the lower end of the trolley drawer. The locking mechanism comprises a pull rope structure and an unlocking mechanism. The end of the pull rope of the pull rope structure is fixed on a pull rope clamp, and the other end is fixed on a pull rope hanging hole. The unlocking mechanism comprises an unlocking pressure rod, an unlocking pulley mechanism and a lock tongue support. The lock tongue support is fixed on a seat mounting rod, and a lock head is fixed on the upper end of the lock tongue support. The seat folding mechanism comprises a seat, a seat pull spring and a seat hanging buckle. The bottom surface of the seat is provided with the seat mounting rod, which extends to the rear end of the seat and is connected with a sliding rod on both sides.

Description

TECHNICAL FIELD

[0001] The automatic recovery mechanism of the trolley seat in the automobile assembly workshop is used for the recovery and release of the seat on the trolley in the automobile assembly workshop, and relates to the design and manufacturing technical field of the automatic movement mechanism of the trolley seat required for the installation of the automobile front cross beam. BACKGROUND

[0002] The automobile front cross beam is used to protect the torsional stiffness of the frame and bear the longitudinal load, and supports the key components of the vehicle. In order to have the bearing capacity of the cross beam, the installation of the cross beam is mainly connected by riveting or bolt fixing, so as to ensure sufficient strength and stiffness, which can bear the negative operating load of the automobile and the torque brought by the wheel transmission.

[0003] In automobile production, each vehicle needs to fasten the E / G room cross beam, also known as the engine compartment cross beam. The current installation process is as follows: since the engine compartment front cross beam is located at the front of the automobile engine compartment and is low in position, generally, the installer needs to bend over or squat during installation, which is not conducive to the health of the installer. Long-term bending and squatting can damage the health of the installer. Therefore, the existing trolley is a part and tool placing table with wheels. During operation, the trolley is pushed to the point where the engine compartment cross beam is assembled, and the trolley and the assembly line move synchronously during the assembly of the cross beam. The seat on the trolley can be pulled out, so that the seat of the trolley can be pulled out during construction, and the seat can be sat on. The seat is moved along with the assembly line to install the cross beam. After the construction work is completed, the seat needs to be kicked back to the placing point in the trolley.

[0004] The existing structure of pulling out and pushing back the trolley seat has the following disadvantages. First, since the seat has no pull-back power, it takes a long time to push the seat back, so there is a waste of action. According to calculation, it takes 3 seconds to complete the pushing back with the foot once. Second, the seat is kicked with the foot, and the aluminum alloy material is used around the frame and the seat. Direct contact with the aluminum alloy parts may accidentally injure the foot and cause injury to the operator. Third, the seat only slides in the fixed groove, and the recovery method is unstable. The seat is often stuck due to the inconsistent kicking force on both sides, which causes more time waste. SUMMARY

[0005] The purpose of the present application is to overcome the defects of the prior art, adopt the linkage action of the pull rope and the spring, and design an automatic recovery mechanism of the trolley seat in the automobile assembly workshop, which can realize the automatic recovery of the seat.

[0006] A. The trolley structure includes a trolley, a trolley drawer, a drawer handle, a trolley rail column, a seat, a trolley wheel, and a seat hook;

[0007] The middle of the trolley is provided with a seat, the upper part of the seat is provided with a trolley drawer, the middle of the trolley drawer is provided with a drawer handle, the side of the trolley drawer is provided with a pulley-rotatable unlocking pulley, and the unlocking pressure rod is arranged on the vertical column at the lower end of the trolley drawer;

[0008] Preferably, the pulley-rotatable unlocking pulley arranged on one side of the trolley drawer is arranged on the same side as the unlocking pressure rod;

[0009] The unlocking pressure rod is rotationally connected to the pressure rod supporting arm, the pressure rod supporting arm is fixed to the vertical column of the trolley, and the lower end of the unlocking pressure rod is provided with a pull rope clip, and the end of the pull rope is fixed to the pull rope clip;

[0010] A seat hook is arranged at the front end of the seat, the seat hook is downwardly hooked, and the seat is conveniently hooked out by the foot;

[0011] Preferably, the trolley wheel is arranged on the bottom frame of the trolley;

[0012] B. The locking mechanism comprises a pull rope structure and an unlocking mechanism;

[0013] The pull rope structure comprises a pull rope, a first pulley, a second pulley, a pull rope clip and a pull rope hanging hole;

[0014] The end of the pull rope is fixed to the pull rope clip, the other end of the pull rope passes through the first pulley and the second pulley twice, and is fixed to the pull rope hanging hole, and the pull rope hanging hole is arranged on the locking tongue plate;

[0015] Preferably, the first pulley is installed on the pulley front supporting arm, and the second pulley is installed on the pulley rear supporting arm;

[0016] The unlocking mechanism comprises an unlocking pressure rod, an unlocking pulley, a locking tongue support, a locking catch supporting column, a locking catch tension spring, a pressure rod supporting arm and a locking catch tension spring hanging hole;

[0017] Preferably, the unlocking pressure rod is arranged at a height matched with the unlocking pulley, and the unlocking pulley arranged on one side of the trolley drawer is arranged on the same side as the unlocking pressure rod;

[0018] The locking tongue support is fixed to the seat mounting rod extended from the rear end of the seat, and a lock head is fixed to the upper end of the locking tongue support;

[0019] Preferably, the rear end of the seat has two extended seat mounting rods, and a transverse connecting rod is arranged between the two seat mounting rods;

[0020] The lock catch post is fixedly installed on the trolley connecting arm at the lower end of the trolley, and a locking mechanism is arranged at the upper end of the lock catch post and fixedly installed on the lock catch post;

[0021] Preferably, the distance from the position of the lock tongue plate installed on the lock catch post to the lock head is the same as the length of the pulled-out stool;

[0022] The locking mechanism comprises a lock pin and a lock catch, the lock pin comprises a pin shaft, an upper support plate on the pin shaft, a lock tongue, a lower support plate on the pin shaft, a pin shaft nut, and a lock tongue plate;

[0023] The upper support plate on the pin shaft, the lower support plate on the pin shaft, and a middle support block of the pin shaft are fixedly installed on the lock catch post;

[0024] Preferably, a through bolt hole is drilled in the middle of the upper support plate on the pin shaft, the lower support plate on the pin shaft, and the middle support block of the pin shaft 34;

[0025] The middle of the lock tongue plate is a quadrangular hollow structure, a pull rope hanging hole and a lock catch tension spring hanging hole are arranged on the left side of the lock tongue plate, and the right side of the lock tongue plate is a triangular structure, the end of the triangular structure is a rounded corner, and the rounded corner facilitates the sliding of the lock head;

[0026] Preferably, a through bolt hole is drilled in each of the upper and lower frames of the quadrangular hollow structure of the lock tongue plate;

[0027] The lock tongue plate with a quadrangular hollow structure is sleeved on the middle support block of the pin shaft on the lock catch post, a bolt is arranged through the bolt hole from top to bottom, the lock tongue plate is sleeved on the bolt, the lower end is fixed by the pin shaft nut, and the lock tongue plate can move back and forth on the pin shaft;

[0028] The lock catch comprises a lock tongue support and a lock head, the lock head is fixed on the lock tongue support, and the lock tongue support is installed on the one-side stool mounting rod matched with the lock catch post at the rear end of the stool;

[0029] C. The stool folding mechanism comprises a stool, a stool tension spring, a stool hanging catch, and a stool mounting rod;

[0030] The bottom surface of the stool is provided with four longitudinal stool mounting rods, the middle two of which extend to the rear end of the stool and are used to connect the stool tension spring and install the lock catch, and the two mounting rods on the two sides are respectively connected with a sliding rod, the two sliding rods on the two sides are inserted into the sliding grooves arranged on the two sides of the trolley, rollers are arranged in the sliding grooves, and the sliding rods on the two sides extending into the sliding grooves slide back and forth on the rollers;

[0031] At the rear end of the stool, a stool tension spring is connected to the transverse connecting rod that connects the two extended stool mounting rods. One end of the stool tension spring is hung on the transverse connecting rod of the extended stool mounting rod at the rear end of the stool, and the other end is hung on the lower connecting rod of the trolley frame.

[0032] Technical effects of the present invention

[0033] 1. The designed drawer-connecting locking mechanism can reduce work waste. After testing, each drawer operation only takes 1 second. There is no need to push the stool back with your foot. Just pull the unlocking device, and the rest is completed by the linked unlocking mechanism. There is a special hook in front of the stool for you to hook out with your foot. You can see the stool being hooked out. Because of the hook, shoes can be hung on the hook without hurting your shoes or feet.

[0034] 2. It adopts torsion springs, tension springs and locking mechanisms. When it needs to be taken back as a stool after the assembly and construction are completed, there is no need to kick it. This fundamentally solves the danger of kicking and injuring the body, thus eliminating this safety hazard.

[0035] 3. The designed stool is installed on the crossbeam below, which is set in the slide. There are sliding rollers in the slide. Therefore, when the stool is retracted, the longitudinal support rods on both sides of the stool will not move unevenly to the left and right and get stuck. Moreover, due to the action of the rollers, the sliding is easy and the retraction is stable, which solves the problem of getting stuck and the time wasted in dealing with accidents.

[0036] 4. The locking spring and the pull rope pull the locking tongue plate from different directions. Therefore, under the action of the torsion spring and the locking spring, they are stretched in two different directions, which can prevent the locking tongue plate from moving freely left and right. When not in use, it is in the initial position, which makes it easy to lock the stool during operation.

[0037] 5. Because the locking tongue and locking head are located on the same side, and the distance between the locking tongue and locking head is the same as the length of the seat pulled out, the locking head will move forward as the seat moves. Therefore, when the locking head moves forward, it will meet the locking tongue and pass over the locking tongue to be locked. After the locking head is locked, the seat will not move freely, which is convenient for operation.

[0038] 6. The wheels located at the bottom of the accompanying tire cart 1 can move with the production line, so the operator can sit on a stool to begin the installation of the front crossbeam of the engine compartment. Attached Figure Description

[0039] Figure 1 This is a schematic diagram of the overall assembly structure of the present invention;

[0040] Figure 2 This is the present invention. Figure 1 A magnified structural diagram of the middle circle A;

[0041] Figure 3 is the structure of the present invention Figure 1 the combined use of the structure of the present invention

[0042] Figure 4 is the structure of the present invention Figure 1 the combined use of the structure of the present invention

[0043] Figure 5 is the structure of the present invention Figure 2 the enlarged structure of the present invention

[0044] Figure: with the trolley 1, trolley drawer 2, drawer handle 3, unlocking pressure bar 4, unlocking pulley 5, lock tongue support 6, second pulley 7, trolley rail column 8, pull rope 9, lock catch support 10, lock catch tension spring 11, first pulley 12, pressure bar support arm 13, stool 14, stool tension spring 15, stool hanging catch 16, trolley wheel 17, pull rope hanging hole 18, lock catch tension spring hanging hole 19, pin shaft 20, pin shaft upper support plate 21, lock tongue 22, pin shaft lower support plate 23, pin shaft nut 24, lock head 25, lock tongue plate 26, lock catch tension spring column 27, roller 28, pull rope clamp 29, pulley front support arm 30, stool mounting rod 31, pulley rear support arm 32, trolley connecting arm 33, pin shaft middle support block 34. DETAILED DESCRIPTION

[0045] In order to further illustrate the structure, connection and use of the present invention, the best embodiment of the present invention is given below in combination with the drawings.

[0046] Embodiment 1: structure and use of the present invention

[0047] The automatic recovery mechanism of the trolley stool in the automobile assembly workshop includes a trolley structure, a locking mechanism, and a stool folding and unfolding mechanism: A. The trolley structure includes a trolley 1, a trolley drawer 2, a drawer handle 3, a trolley rail column 8, a stool 14, a trolley wheel 17, and a stool hanging catch 16; the middle of the trolley 1 is provided with a stool 14, the upper part of the stool 14 is provided with a trolley drawer 2, the middle of the trolley drawer 2 is provided with a drawer handle 3, one side of the trolley drawer 2 is provided with a rotatable unlocking pulley 5, and the unlocking pressure bar 4 is arranged on the vertical column at the lower end of the trolley drawer 2; one side of the trolley drawer 2 is provided with a rotatable unlocking pulley 5 arranged on the same side as the unlocking pressure bar 4, the unlocking pressure bar 4 is fixedly connected to the pressure bar support arm 13, the pressure bar support arm 13 is fixed to the vertical column of the trolley 1, and a pull rope clamp 29 is arranged at the lower end of the unlocking pressure bar 4, and one end of the pull rope 9 is fixed to the pull rope clamp 29.

[0048] The front end of the seat 14 is provided with a seat hook 16, which is downwardly hooked to facilitate hooking out the seat 14 with the foot. The unlocking pressure rod 4 is rotatably arranged on the pressure rod supporting arm 13. The trolley wheels 17 are arranged on the bottom frame of the trolley 1.

[0049] The designed drawer interlocking locking mechanism can reduce operation waste. According to tests, only 1 second is needed for each operation of the drawer. The seat does not need to be pushed back with the foot. Only the unlocking device needs to be pulled. The rest is completed by the interlocking unlocking mechanism for recovering the seat. The front end of the seat is provided with a hook for hooking out the seat with the foot. The seat can be hooked out. Due to the hook, the shoes are hung on the hook. The shoes and the foot surface are not hung and injured.

[0050] B. The locking mechanism comprises a pull rope structure and an unlocking mechanism. The pull rope structure comprises a pull rope 9, a first pulley 12, a second pulley 7, a pull rope clamp 29 and a pull rope hook hole 18. One end of the pull rope 9 is fixed on the pull rope clamp 29. The other end of the pull rope 9 is fixed on the pull rope hook hole 18 after being changed direction twice through the first pulley 12 and the second pulley 7. The pull rope hook hole 18 is arranged on the lock tongue plate 26. The first pulley 12 is installed on the pulley front supporting arm 30. The second pulley 7 is installed on the pulley rear supporting arm 32. The unlocking mechanism comprises an unlocking pressure rod 4, an unlocking pulley 5, a lock tongue supporting 6, a lock catch supporting column 10, a lock catch tension spring 11, a pressure rod supporting arm 13 and a lock catch tension spring hook hole 19. The unlocking pressure rod 4 is arranged at a height matched with the unlocking pulley 5. The unlocking pulley 5 arranged on one side of the trolley drawer 2 is arranged on the same side as the unlocking pressure rod 4. When the trolley drawer 2 is pulled out, the unlocking pulley 5 arranged on one side of the trolley drawer 2 can press on the unlocking pressure rod 4.

[0051] The lock tongue supporting 6 is fixed on the seat mounting rod 31 extended from the rear end of the seat 14. The lock head 25 is fixed on the upper end of the lock tongue supporting 6. The rear end of the seat 14 has two extended seat mounting rods 31. The two seat mounting rods 31 have a transverse connecting rod therebetween. The lock catch supporting column 10 is fixedly installed on the trolley connecting arm 33 at the lower end of the trolley. The locking mechanism is arranged on the upper end of the lock catch supporting column 10 and is fixedly installed on the lock catch supporting column 10.

[0052] The structure adopts a torsional spring, a tension spring and a locking mechanism. When the seat needs to be recovered after assembly and construction are completed, the foot does not need to be kicked. The danger of kicking the body is fundamentally solved. Therefore, the safety hidden danger in this aspect is eliminated.

[0053] The lock tongue plate 26 installed on the lock catch pillar 10 is at the same distance from the lock head 25 as the length of the pulled-out seat 14, so that when the seat 14 is completely pulled out, the lock head 25 at the rear end can be locked by the lock tongue 22 of the lock tongue plate 26 installed on the lock catch pillar 10.

[0054] Since the lock tongue and the lock head are arranged on the same side in cooperation, and the distance between the lock tongue and the lock head is the same as the length of the pulled-out seat, the lock head 25 moves forward with the movement of the seat, so that when the lock head moves forward, it meets the lock tongue 22 and is locked by passing the lock tongue. When the lock head is locked, the seat cannot move freely, which is convenient for operation.

[0055] The locking mechanism includes a lock pin and a lock catch. The lock pin includes a pin shaft 20, an upper pin shaft support plate 21, a lock tongue 22, a lower pin shaft support plate 23, a pin shaft nut 24, and a lock tongue plate 26. The upper pin shaft support plate 21, the lower pin shaft support plate 23, and a pin shaft middle support block 34 are fixedly installed on the lock catch pillar 10, and a through bolt hole is drilled in the middle of the upper pin shaft support plate 21, the lower pin shaft support plate 23, and the pin shaft middle support block 34. The middle of the lock tongue plate 26 is a square hollow structure. The left side of the lock tongue plate 26 is provided with a pull rope hanging hole 18 and a lock catch pull spring hanging hole 19. The right tip of the lock tongue plate 26 is a triangular structure. The end of the triangular structure is rounded, which facilitates the sliding of the lock catch 25. Through bolt holes are drilled in the upper and lower frames of the square hollow structure of the lock tongue plate 26. The lock tongue plate 26 with a square hollow structure is sleeved on the pin shaft middle support block 34 of the lock catch pillar 10. The bolt is inserted from the top to the bottom through the through bolt hole, and the lock tongue plate 26 is sleeved on the bolt. The lower end is fixed by the pin shaft nut 24. The installed lock tongue plate 26 can move forward and backward on the pin shaft 20. The lock catch includes a lock tongue support 6 and a lock head 25. The lock head 25 is fixed on the lock tongue support 6. The lock tongue support 6 is installed on the seat installation rod 31 on the same side of the lock catch pillar 10 at the rear end of the seat 14. When the seat 14 moves, the seat installation rod 31 moves with the forward and backward movement of the seat 14.

[0056] C. The seat folding mechanism comprises the seat 14, seat tension spring 15, seat hook 16, and seat mounting rod 31. The bottom surface of the seat 14 is provided with four longitudinal seat mounting rods, the middle two of which extend to the rear end of the seat for connecting the seat tension spring 15 and the mounting lock catch. The two side mounting rods are respectively connected to a sliding rod. The two side sliding rods are inserted into the sliding grooves provided on the two sides of the trolley. The rolling cylinders 28 are arranged in the sliding grooves. The two side sliding rods extending into the sliding grooves slide on the rolling cylinders 28. At the tail end of the seat 14, the transverse connecting rod connecting the two extended seat mounting rods 31 is connected to the seat tension spring 15. One end of the seat tension spring 15 is hung on the transverse connecting rod of the extended seat mounting rod 31 at the rear end of the seat 14, and the other end is hung on the lower connecting rod of the trolley frame.

[0057] The designed seat is mounted on the horizontal beam arranged below, the horizontal beam is arranged in the sliding groove, and the sliding rolling cylinder 28 is arranged in the sliding groove. Therefore, when the seat is recovered, the two side longitudinal supporting rods of the seat will not be stuck due to the inconsistent left and right movement, and the sliding is easy and stable due to the effect of the rolling cylinder 28, the sticking problem is solved, and the time for handling the accident is saved.

[0058] Embodiment 2: Working principle

[0059] 1. The pull rope 9 and the lock catch tension spring 11 are respectively connected to the pull rope hanging hole 18 and the lock catch tension spring hanging hole 19 arranged on the same lock tongue plate 26. The return torsion spring is arranged on the unlocking pressure rod 4 to keep the unlocking pressure rod 4 in the original position without external force. The lock catch tension spring 11 and the pull rope 9 pull the lock tongue plate 26 from different directions, so that the lock tongue plate 26 arranged in different directions is stretched under the effect of the torsion spring and the lock catch tension spring 11. Thus, the lock tongue plate 26 arranged cannot move freely left and right, and is in the initial position when not in use. Only when the seat hook 16 is hooked by the foot and the seat 14 is pulled forward, the lock tongue plate 26 mounted on the extended seat mounting rod 31 at the rear end of the seat 14 can be moved forward, and the lock head 25 is locked on the lock tongue 22. Or when the drawer handle 3 is pulled open, the unlocking pressure rod 4 is pressed down, the pull rope 9 arranged at the lower end of the unlocking pressure rod 4 is pulled, the locked lock head 25 is unlocked, and each part returns to the original position.

[0060] 2, The seat 14 of the device is designed to be quickly pulled out and locked in a fixed position when needed, facilitating construction. Therefore, two rollers 28 are arranged at the bottom of the seat. When the installation work is completed and the seat 14 needs to be retracted, the drawer handle 3 is pulled open, and the arranged unlocking pulley 5 will press on the unlocking pressure rod 4. The upper end of the unlocking pressure rod 4 is pressed down, causing the lower end to lift up. In this way, the pull rope 9 can be pulled up, and the lock tongue plate 26 is pulled through the first pulley 12 and the second pulley 7. The lock tongue plate 26 is pulled by the pull rope 9, overcoming the locking spring 11, and the pull force on the other side causes the arranged lock tongue plate 26 to lose balance, causing the other end of the lock tongue 22 to be pulled obliquely to open the lock and release the lock head 25. The seat 14 loses the locking function and is automatically returned to the initial state under the pull of the seat spring 15 behind it.

[0061] Example 3: Use process

[0062] When there is a task of installing the engine compartment front beam on the production line, if the operator stands to install, he needs to bend down or squat, which is not convenient for quick operation and is not conducive to the principle of employee health. Therefore, the operator of the engine compartment front beam installation station will push the accompanying trolley 1 carrying installation components and auxiliary parts to the appropriate position, then hook the seat 14 front end seat hook 16 with his foot, and pull out the seat 14. Since the seat pull spring 15 is connected to the transverse connecting rod between the two rear extended seat installation rods 31, when the seat 14 is pulled forward, the seat pull spring 15 will be stretched, and at the same time, the lock head 25 installed on the extended seat installation rod 31 will also move forward with the forward movement of the seat 14. Since the lock tongue 22 and the lock head 25 are arranged on the same side, and since the installation distance between the lock head 25 and the lock tongue 22 on the seat installation rod 31 is the same as the length of the seat pulled out, when the lock head 25 moves forward with the seat, the lock tongue 22 is fixedly installed and cannot move. Therefore, when the lock head 25 moves forward, it will meet the lock tongue 22 and pass through the lock tongue 22 to be locked. When the lock head 25 is locked, the seat 14 cannot move freely. The wheels arranged at the bottom of the accompanying trolley 1 can move with the movement of the assembly line, so the operator can sit on the seat and start the installation of the engine compartment front beam.

[0063] When the installation of the engine bay front beam is completed, the trolley 1 needs to be returned to the original position to facilitate the forward movement of the production line. At this time, the operator only needs to pull the drawer handle 3 to move the trolley drawer 2 outwards. At this time, the unlocking pulley 5 will move forward and press on the unlocking pressure rod 4. The lower end of the unlocking pressure rod 4 will then be raised upwards, causing the pull rope 9 fixed to the pull rope clamp 29 at the tail end of the unlocking pressure rod 4 to be pulled upwards. After reversing through the first pulley 12 and the second pulley 7, the pull rope 9 connected to the pull rope hanging hole 18 of the lock tongue plate 26 pulls the lock tongue plate 26 to move. In this way, the locked lock head 25 is unlocked. Under the pull of the seat pull spring 15, the seat 14 automatically returns to the original position, and the locking head 25 set on the extended seat mounting rod 31 at the rear end is also returned to the original position. Then, the operator pushes the drawer handle 3, and the trolley drawer 2 returns to the original position. After the trolley drawer 2 returns to the original position, the unlocking pressure rod 4 loses the pressure of the unlocking pulley 5 on the unlocking pressure rod 4. At this time, the unlocking pressure rod 4 automatically returns to the original position under the action of the torsional spring, preparing for the next use. latch tongue support 6 and

[0064] Further, the torsional spring provided on the unlocking pressure rod 4 is a common torsional spring, which is also a spring familiar to ordinary technical personnel in the technical field. At the same time, the installation of such a torsional spring is also understood by ordinary technical personnel in the technical field. Therefore, it will not be described in detail here.​

Claims

1. An automatic seat recovery mechanism for a traveling trolley in an automotive assembly workshop, comprising a trolley structure, a locking mechanism, and a seat recovery and release mechanism, characterized in that: A. The trolley structure includes a traveling trolley (1), a trolley drawer (2), a drawer handle (3), a trolley railing post (8), a seat (14), trolley wheels (17), and a seat hook (16); a seat (14) is provided in the middle of the traveling trolley (1), a trolley drawer (2) is provided on the upper part of the seat (14), a drawer handle (3) is provided in the middle of the trolley drawer (2), an unlocking pulley (5) is provided on one side of the trolley drawer (2), and an unlocking lever (4) is provided on the upright at the lower end of the trolley drawer (2), and the unlocking lever (4) is fixedly connected to the lever support arm (13); B. The locking mechanism includes a pull rope structure and an unlocking mechanism; the pull rope structure includes a pull rope (9), a first pulley (12), a second pulley (7), a pull rope clip (29), and a pull rope hanging hole (18); one end of the pull rope (9) is fixed on the pull rope clip (29), and the other end of the pull rope (9) is fixed on the pull rope hanging hole (18) after passing through the first pulley (12) and the second pulley (7) twice. The pull rope hanging hole (18) is set on the lock tongue plate (26); the unlocking mechanism includes an unlocking pressure rod (4), an unlocking pulley (5), a lock tongue support (6), a lock buckle support column (10), a lock buckle spring (11), a pressure rod support arm (13), and a lock buckle spring hanging hole (19). The lock tongue support (6) is fixed on the seat mounting rod (31) extending from the rear end of the seat (14), and a lock head (25) is fixed on the upper end of the lock tongue support (6); The locking mechanism also includes a locking pin and a locking buckle. The locking pin includes a pin shaft (20), a pin shaft upper support plate (21), a locking tongue (22), a pin shaft lower support plate (23), a pin shaft nut (24), and a locking tongue plate (26). The locking buckle includes a locking tongue support (6) and a locking head (25). The locking head (25) is fixed on the locking tongue support (6). The locking tongue support (6) is installed on the seat mounting rod (31) at the rear end of the seat (14) that cooperates with the locking buckle support column (10). C. The stool storage and retrieval mechanism includes a stool (14), a stool tension spring (15), a stool hook (16), and stool mounting rods (31); the bottom surface of the stool (14) is provided with four longitudinal stool mounting rods, the two middle stool mounting rods extend to the rear end of the stool (14), and each of the two side mounting rods is connected to a sliding rod. The sliding rods are all inserted into the sliding grooves provided on both sides of the trolley, and rollers (28) are provided in the sliding grooves; at the rear end of the stool (14), a stool tension spring (15) is connected to the transverse connecting rod connecting the two extended stool mounting rods (31); the rear end of the stool (14) has two extended stool mounting rods (31), and there is a transverse connecting rod between the two stool mounting rods (31); a stool hook (16) is provided at the front end of the stool (14); the stool hook (16) is in the shape of a downward hook.

2. The automatic retraction mechanism for the seat of the accompanying trolley in the automobile assembly workshop according to claim 1, characterized in that: The unlocking pulley (5) on one side of the trolley drawer (2) is located on the same side as the unlocking lever (4). A pull rope clip (29) is provided at the lower end of the unlocking lever (4), and the end of the pull rope (9) is fixed on the pull rope clip (29).

3. The automatic retraction mechanism for the seat of the accompanying trolley in the automobile assembly workshop according to claim 1, characterized in that: The trolley wheels (17) are mounted on the bottom frame of the traveling trolley (1), and the pressure rod support arm (13) is fixed on the vertical column of the traveling trolley (1).

4. The automatic retraction mechanism for the seat of the accompanying trolley in the automobile assembly workshop according to claim 1, characterized in that: The first pulley (12) is mounted on the front support arm (30) of the pulley, and the second pulley (7) is mounted on the rear support arm (32) of the pulley.

5. The automatic retraction mechanism for the seat of the accompanying trolley in the automobile assembly workshop according to claim 1, characterized in that: The height of the unlocking lever (4) is matched with that of the unlocking pulley (5), and the unlocking pulley (5) is located on the same side as the unlocking lever (4) on one side of the trolley drawer (2).

6. The automatic recycling mechanism for the seat of the accompanying trolley in the automobile assembly workshop according to claim 1, characterized in that: The distance between the locking tongue plate (26) on the locking support (10) and the position on the trolley connecting arm (33) from the lock head (25) is the same as the length of the seat (14) pulled out.

7. The automatic retraction mechanism for the seat of the accompanying trolley in the automobile assembly workshop according to claim 1, characterized in that: A pin upper support plate (21), a pin lower support plate (23), and a pin middle support block (34) are fixedly installed on the locking support column (10); the locking support column (10) is fixedly installed on the trolley connecting arm (33) at the lower end of the trolley, and a locking mechanism is provided at the upper end of the locking support column (10).

8. The automatic retraction mechanism for the seat of the accompanying trolley in the automobile assembly workshop according to claim 7, characterized in that: Through bolt holes are drilled on the upper and lower sides of the latch plate (26); the latch plate (26) has a square hollow structure in the middle, a pull rope hanging hole (18) and a lock spring hanging hole (19) are provided on the left side of the latch plate (26), and a triangular latch is provided at the right tip of the latch plate (26). The end of the triangular structure is rounded, and the rounded corners facilitate the sliding of the lock head (25); the latch plate (26) with a square hollow structure is fitted on the pin middle support block (34) on the lock pillar (10). The bolt hole is provided by the bolt from top to bottom. The latch plate (26) is fitted on the bolt, and the lower end is fixed by the provided pin nut (24). The bolt constitutes the pin, and the latch plate (26) can move back and forth on the pin (20).

9. The automatic retraction mechanism for the seat of the accompanying trolley in the automobile assembly workshop according to claim 7, characterized in that: Through bolt holes are drilled in the middle of the upper support plate (21), the lower support plate (23), and the middle support block (34) of the pin shaft.

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