Finished product push-out structure for automobile part forging

Abstract

The invention discloses a finished product push-out structure for automobile part forging, and belongs to the technical field of automobile part forging, the finished product push-out structure comprises a forging machine main body, a material pushing mechanism is rotatably connected to the forging machine main body, a material guiding seat is fixedly connected to one side of the forging machine main body, and a transmission mechanism is rotatably connected to the material guiding seat; a plurality of discharging seats are rotatably connected to the fixing column, a plurality of adjusting mechanisms are rotatably connected to the fixing column, after the forging machine is used for forging the automobile brake pads, the discharging seats can intermittently rotate under the driving of the adjusting mechanisms, and the multiple brake pads can be placed in one circulation; and the long-time shutdown or material changing process does not need to be carried out between every two production batches, so that the production efficiency of the forging machine is greatly improved, the idle time of equipment is reduced, the automation degree is improved, and manual intervention is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile component forging, and in particular relates to a finished product ejecting structure for automobile component forging. Background Art

[0002] Auto parts forging is one of the important processes in automobile manufacturing, mainly used to produce key parts with high strength, wear resistance and reliability, such as engine parts, transmission system parts, suspension system parts, etc. The forging process changes the internal structure of metal materials through plastic deformation, thereby improving their mechanical properties, especially their performance under heavy loads, impacts and high temperature environments.

[0003] Some invention patents in the field of automobile parts forging technology are disclosed in the prior art. Among them, the invention patent with application number 202410496807.2 discloses a finished product pushing structure for automobile parts forging. The invention can achieve the purpose of pushing and unloading the blank finished parts by setting up a pushing unit and a cooling and quenching feeding unit. During the unloading process, the operator does not need to use external large-scale equipment for unloading. At the same time, it is not necessary to use external large-scale equipment for transportation during cooling and quenching, which avoids the phenomenon of large equipment falling off when transporting the blank finished parts, avoids the occurrence of dangerous accidents, increases the stability of unloading, and reduces the processing cost.

[0004] When the existing technology is used, firstly, since there are only two receiving plates and the quantity is limited, each forging cycle can only process two finished brake pads. This means that after each production batch is completed, the machine needs to be stopped to transfer the finished products and replace the receiving plates in order to carry out the production of the next batch. This frequent shutdown not only interrupts the continuity of production, but also leads to a significant increase in equipment idle time, which in turn affects the overall efficiency of automotive parts forging. Secondly, during the material replacement process, workers need to manually remove the finished products from the receiving plates and place them in the designated position. This step is not only time-consuming and labor-intensive, but also has certain safety hazards. At the same time, due to the intervention of manual operation, the degree of automation of the production process is limited, making it difficult to achieve efficient and stable continuous production.

[0005] Based on this, the present invention designs a finished product ejection structure for forging automobile parts to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that only two finished products can be received at a time, which requires frequent shutdowns, transferring the finished products to other locations and taking them off for receiving them again. The idle time of the equipment increases during the material replacement process, resulting in low efficiency in forging automobile parts. A finished product push-out structure for forging automobile parts is proposed.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A finished product ejection structure for forging automobile parts comprises a forging machine body, a material pushing mechanism is rotatably connected to the forging machine body, a material guide seat is fixedly connected to one side of the forging machine body, a transmission mechanism is rotatably connected to the material guide seat, a transfer seat is provided on one side of the forging machine body, a step frame is slidably provided on the transfer seat, a fixed column is slidably provided on the transfer seat, a plurality of material discharge seats are rotatably connected to the fixed column, and a plurality of adjustment mechanisms are rotatably provided on the fixed column.

[0009] As a further description of the above technical solution:

[0010] The pushing mechanism includes a toggle rod, the top end of the toggle rod is rotatably connected to the forging machine body, one end of the toggle rod connected to the forging machine body is connected and fixedly provided with a motor, the motor is connected and fixedly provided with the forging machine body, the bottom end of the toggle rod is slidably fitted with a moving frame, a pushing rack is fixedly connected to the moving frame, the pushing rack is slidably fitted with the forging machine body, and one end of the pushing rack is fixedly connected to a transmission rack.

[0011] As a further description of the above technical solution:

[0012] The lower surface of the material guide seat is symmetrically structured and is connected and fixed with two positioning rings.

[0013] As a further description of the above technical solution:

[0014] The transmission mechanism includes a universal joint, which is rotatably connected to the material guide seat. One end of the universal joint passes through the lower surface of the material guide seat and extends to the upper side and is connected and fixedly provided with a transmission wheel. The transmission wheel is meshed with a transmission rack for transmission. The other end of the universal joint is connected and fixedly provided with a threaded rod.

[0015] As a further description of the above technical solution:

[0016] A gear rack is threadedly connected on the threaded rod, and a plurality of transmission teeth are rotatably connected on the gear rack in a linear structure. A spring is fixedly connected to one end of the transmission tooth, and the other end of the spring is fixedly connected to the gear rack.

[0017] As a further description of the above technical solution:

[0018] A U-shaped pull frame is slidably arranged on the transfer seat, and positioning rods are fixedly arranged at both ends of one side of the U-shaped pull frame, and the positioning rods are movably plugged into the positioning ring.

[0019] As a further description of the above technical solution:

[0020] An electric push rod is fixedly connected to the bottom end of the step frame, and the other end of the electric push rod is fixedly connected to the transfer seat. A push handle is fixedly connected to the step frame.

[0021] As a further description of the above technical solution:

[0022] Rollers are rotatably connected and fixed on both sides of the bottom end of the fixed column, a slider is rotatably connected to the other end of the roller, the slider is slidably matched with the transfer seat, the roller is in sliding contact with the step frame, a hydraulic rod is connected and fixed to the top of the fixed column, the output end of the hydraulic rod extends into the fixed column and is connected and fixed with a plurality of conical blocks, a plurality of push rods are slidably matched through the fixed column, a tension spring is connected and fixed on the push rod, and the other end of the tension spring is connected and fixed to the inner wall of the fixed column.

[0023] As a further description of the above technical solution:

[0024] The upper surface of the discharge seat is annular in structure and has multiple discharge grooves, a lifting plate is slidably arranged in the discharge groove, a connecting rod is rotatably connected to the bottom end of the lifting plate, and a contact rod is rotatably connected to the other end of the connecting rod, the contact rod is slidably fitted with the discharge seat, one end of the contact rod is movably contacted with the top rod, and an annular rack is fixedly connected to the lower surface of the discharge seat.

[0025] As a further description of the above technical solution:

[0026] The adjusting mechanism comprises a worm, one end of which is rotatably connected to a fixed column, the other end of which is connected and fixedly provided with a one-way wheel, the one-way wheel is meshingly transmitted with a transmission tooth, one side of the worm is meshingly transmitted with a worm wheel, the worm wheel is rotatably connected to a fixed column, an adjusting wheel is connected and fixedly provided on the worm wheel, and the adjusting wheel is meshingly transmitted with an annular rack.

[0027] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0028] 1. In the present invention, after forging the automobile brake pads by using a forging machine, by setting a plurality of discharge seats, the discharge seats can be intermittently rotated under the drive of the adjustment mechanism, and the placement of a plurality of brake pads can be completed in one cycle without the need for a long shutdown or material replacement process between each production batch. The parallel use of a plurality of discharge seats greatly improves the production efficiency of the forging machine and reduces the idle time of the equipment. It not only improves the degree of automation and reduces manual intervention, but also optimizes the production process through reasonable process layout and precise control system.

[0029] 2. In the present invention, after the automobile brake pad is forged by the forging machine, the pushing mechanism can automatically push the finished brake pad from the forging machine to the discharge seat, without manual unloading. At the same time, the pushing mechanism can drive the transmission mechanism, so that the transmission mechanism can drive the adjustment mechanism to realize the intermittent rotation of the discharge seat. Through the linkage of the pushing, transmission, adjustment and other systems, manual operation is reduced and the production efficiency is improved. Through the parallel operation of multiple discharge seats, the frequency of replacing and adjusting the discharge seats is reduced. The positioning rod ensures the accurate placement of the brake pad and avoids failures caused by positioning errors. Automation reduces manual operation and improves the safety of the production process.

[0030] 3. In the present invention, by arranging a step rack, after one discharge seat is full, the discharge seat on another layer can be lowered to a suitable position to receive the material, which can avoid manual adjustment and manual operation and improve the level of automation. Each discharge seat can automatically receive the finished brake pads in a set order, reducing the material change and downtime. The discharge seat can automatically enter the working position and avoid the process of waiting for manual adjustment. At the same time, by arranging a push rod in the fixed column, the lifting plate can be lifted up to eject the finished brake pads in the discharge seat, thereby facilitating the removal of the finished brake pads and improving the safety and reliability of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall structure of a finished product ejection structure for forging automobile parts proposed by the present invention;

[0032] Figure 2 This is a schematic diagram of the other side of the overall structure of a finished product ejection structure for forging automobile parts proposed by the present invention;

[0033] Figure 3 This is a schematic diagram of the structure of a pusher mechanism for a finished product pusher structure for forging automobile parts proposed by the present invention;

[0034] Figure 4 This is a schematic structural diagram of a material guide seat of a finished product ejection structure for forging automobile parts proposed by the present invention;

[0035] Figure 5 This is a schematic diagram of the transmission mechanism structure of a finished product ejection structure for forging automobile parts proposed by the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of a transfer seat for a finished product ejection structure for forging automobile parts proposed by the present invention;

[0037] Figure 7 This is a schematic diagram of a step frame structure of a finished product ejection structure for forging automotive parts proposed by the present invention;

[0038] Figure 8 This is a schematic cross-sectional view of a fixed column structure of a finished product ejection structure for forging automobile parts proposed by the present invention;

[0039] Fig. 9 This is a schematic cross-sectional view of a discharge seat structure of a finished product ejection structure for forging automobile parts proposed by the present invention;

[0040] Fig.10 The present invention provides a schematic diagram of the structure of an adjustment mechanism for a finished product ejection structure for forging automobile parts.

[0041] Legend:

[0042] 1. Forging machine body; 2. Pushing mechanism; 3. Guide seat; 4. Transmission mechanism; 5. Transfer seat; 6. Step frame; 7. Fixed column; 8. Unloading seat; 9. Adjustment mechanism; 201. Toggle lever; 202. Motor; 203. Moving frame; 204. Pushing frame; 205. Transmission rack; 301. Positioning ring; 401. Universal joint; 402. Transmission wheel; 403. Threaded rod; 404. Gear rack; 405. Transmission gear; 406 , spring; 501, U-shaped puller; 502, positioning rod; 601, electric push rod; 602, push handle; 701, roller; 702, slider; 703, hydraulic rod; 704, conical block; 705, push rod; 706, tension spring; 801, discharge chute; 802, lifting plate; 803, connecting rod; 804, contact rod; 805, annular rack; 901, worm; 902, one-way wheel; 903, worm wheel; 904, adjusting wheel. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] Please refer to the attached Figure 1 -Attached Fig.10 The present invention provides a technical solution: a finished product pushing structure for forging automobile parts, comprising a forging machine body 1, a pushing mechanism 2 is rotatably connected to the forging machine body 1, a material guide seat 3 is fixedly connected to one side of the forging machine body 1, a transmission mechanism 4 is rotatably connected to the material guide seat 3, a transfer seat 5 is provided on one side of the forging machine body 1, a step frame 6 is slidably provided on the transfer seat 5, a fixed column 7 is slidably provided on the transfer seat 5, a plurality of discharge seats 8 are rotatably provided on the fixed column 7, and a plurality of adjustment mechanisms 9 are rotatably provided on the fixed column 7.

[0045] Specifically, Figure 3 As shown, the push mechanism 2 includes a toggle rod 201, the top of which is rotatably connected to the forging machine body 1, and one end of the toggle rod 201 connected to the forging machine body 1 is connected and fixed with a motor 202, and the motor 202 is connected and fixed with the forging machine body 1, and the bottom of the toggle rod 201 is slidably matched with a moving frame 203, and a push rack 204 is connected and fixed on the moving frame 203, and the push rack 204 is slidably matched with the forging machine body 1, and a transmission rack 205 is connected and fixed at one end of the push rack 204. The motor 202 is used to drive the connected toggle rod 201 to rotate, so that the other end of the toggle rod 201 slides in the moving frame 203, thereby driving the push rack 204 connected to the moving frame 203 to move, and the finished brake pad is pushed into the discharge groove 801 on the discharge seat 8.

[0046] Specifically, Figure 4 As shown, the lower surface of the material guide seat 3 is symmetrically structured and is fixedly provided with two positioning rings 301 .

[0047] Specifically, Figure 5 As shown, the transmission mechanism 4 includes a universal joint 401, which is rotatably connected to the material guide seat 3. One end of the universal joint 401 passes through the lower surface of the material guide seat 3 and extends to the upper side and is connected and fixedly provided with a transmission wheel 402. The transmission wheel 402 is meshed with the transmission rack 205 for transmission. The other end of the universal joint 401 is connected and fixedly provided with a threaded rod 403.

[0048] A gear rack 404 is threadedly connected to the threaded rod 403, and a plurality of transmission teeth 405 are rotatably connected to the gear rack 404 in a linear structure. A spring 406 is fixedly connected to one end of the transmission tooth 405, and the other end of the spring 406 is fixedly connected to the gear rack 404. When the pusher rack 204 moves and retracts, the transmission wheel 402 is driven to rotate through the transmission rack 205, so that the transmission wheel 402 drives the threaded rod 403 connected to the universal joint 401 to rotate forward and reverse, thereby driving the gear rack 404 to move. When the gear rack 404 is reset, the transmission teeth 405 drive the one-way wheel 902 to rotate under the action of the spring 406.

[0049] Specifically, Figure 6 As shown, a U-shaped puller 501 is slidably provided on the transfer seat 5, and positioning rods 502 are fixedly provided at both ends of one side of the U-shaped puller 501, and the positioning rods 502 are movably plugged into the positioning ring 301. The U-shaped puller 501 is lifted by the foot, so that the U-shaped puller 501 drives the connected positioning rods 502 to be taken out of the positioning ring 301.

[0050] Specifically, Figure 7As shown, the bottom end of the step frame 6 is connected and fixedly provided with an electric push rod 601, the other end of the electric push rod 601 is connected and fixedly provided with the transfer seat 5, and a push handle 602 is connected and fixedly provided on the step frame 6. The electric push rod 601 is used to drive the step frame 6 to move outward, at this time, the roller 701 on the fixed column 7 will fall to the next step of the step frame 6, at this time, the fixed column 7 will drive the discharge seat 8 to descend, so that another empty discharge seat 8 falls to the guide seat 3.

[0051] Specifically, Figure 8 As shown, rollers 701 are rotatably connected and fixedly provided on both sides of the upper and lower ends of the fixed column 7, a slider 702 is rotatably connected and provided on the other end of the roller 701, the slider 702 is slidably matched with the transfer seat 5, the roller 701 is slidably contacted with the step frame 6, a hydraulic rod 703 is connected and fixedly provided on the top of the fixed column 7, the output end of the hydraulic rod 703 extends into the fixed column 7 and is connected and fixedly provided with a plurality of conical blocks 704, a plurality of push rods 705 are slidably matched with the fixed column 7, a tension spring 706 is connected and fixedly provided on the push rod 705, and the other end of the tension spring 706 is connected and fixedly provided with the inner wall of the fixed column 7. The hydraulic rod 703 is used to drive the connected conical block 704 to move upward, so that the conical block 704 can contact and squeeze the push rod 705, so that the push rod 705 is inserted into the material discharge seat 8, so that the push rod 705 contacts and squeezes the contact rod 804, so that the contact rod 804 drives the lifting plate 802 connected to the connecting rod 803 to move upward.

[0052] Specifically, Fig. 9 As shown, the upper surface of the discharge seat 8 is annular in structure and has multiple discharge grooves 801, a lifting plate 802 is slidably arranged in the discharge groove 801, a connecting rod 803 is rotatably connected to the bottom end of the lifting plate 802, and a contact rod 804 is rotatably connected to the other end of the connecting rod 803, the contact rod 804 is slidably arranged to cooperate with the discharge seat 8, one end of the contact rod 804 is movably contacted with the top rod 705, and an annular rack 805 is fixedly connected to the lower surface of the discharge seat 8.

[0053] Specifically, Fig.10 As shown, the adjustment mechanism 9 includes a worm 901, one end of the worm 901 is rotatably connected to the fixed column 7, the other end of the worm 901 is connected and fixed with a one-way wheel 902, the one-way wheel 902 is meshed and driven with the transmission gear 405, one side of the worm 901 is meshed and driven with a worm wheel 903, the worm wheel 903 is rotatably connected to the fixed column 7, an adjustment wheel 904 is connected and fixed on the worm wheel 903, and the adjustment wheel 904 is meshed and driven with the annular rack 805. The one-way wheel 902 drives the connected worm 901 to rotate, so that the worm 901 drives the adjustment wheel 904 connected to the worm wheel 903 to rotate, so that the adjustment wheel 904 drives the unloading seat 8 connected to the annular rack 805 to rotate.

[0054] Working principle, when in use: after the brake pad is forged by the forging machine body 1, the motor 202 is used to drive the connected toggle rod 201 to rotate, so that the other end of the toggle rod 201 slides in the moving frame 203, thereby driving the pusher frame 204 connected to the moving frame 203 to move, and push the finished brake pad into the discharge groove 801 on the discharge seat 8;

[0055] At the same time, when the pusher rack 204 moves and retracts, the transmission wheel 402 is driven to rotate through the transmission rack 205, so that the transmission wheel 402 drives the threaded rod 403 connected to the universal joint 401 to rotate forward and reverse, thereby driving the gear rack 404 to move. When the gear rack 404 is reset, the transmission gear 405 drives the one-way wheel 902 to rotate under the action of the spring 406;

[0056] Then the one-way wheel 902 drives the connected worm 901 to rotate, so that the worm 901 drives the adjusting wheel 904 connected to the worm wheel 903 to rotate, so that the adjusting wheel 904 drives the material discharge seat 8 connected to the annular rack 805 to rotate a certain angle, so that the other material discharge trough 801 rotates to the material guide seat 3;

[0057] After one of the unloading seats 8 is filled with brake pads, the electric push rod 601 is used to drive the step frame 6 to move outward, and the roller 701 on the fixed column 7 will fall to the next step of the step frame 6. At this time, the fixed column 7 will drive the unloading seat 8 to descend, so that the other empty unloading seat 8 falls to the guide seat 3 to receive the material;

[0058] After the discharge seat 8 is full, the step frame 6 is also moved to the outermost side, so that the push handle 602 is moved out, and then the U-shaped pull frame 501 can be lifted by the foot, so that the U-shaped pull frame 501 drives the connected positioning rod 502 to be taken out from the positioning ring 301, so that the transfer seat 5 can be pushed away;

[0059] Then, the hydraulic rod 703 is used to drive the connected conical block 704 to move upward, so that the conical block 704 can contact and squeeze the push rod 705, so that the push rod 705 is inserted into the discharge seat 8, so that the push rod 705 contacts and squeezes the contact rod 804, so that the contact rod 804 drives the lifting plate 802 connected to the connecting rod 803 to move upward, and the brake pad is pushed out for easy removal.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A finished product ejection structure for forging automobile parts, comprising a forging machine body (1), characterized in that: A material pushing mechanism (2) is rotatably connected to the forging machine body (1), a material guide seat (3) is fixedly connected to one side of the forging machine body (1), a transmission mechanism (4) is rotatably connected to the material guide seat (3), a transfer seat (5) is provided on one side of the forging machine body (1), a step frame (6) is slidably provided on the transfer seat (5), a fixed column (7) is slidably provided on the transfer seat (5), a plurality of material discharge seats (8) are rotatably connected to the fixed column (7), and a plurality of adjustment mechanisms (9) are rotatably provided on the fixed column (7).

2. The finished product ejection structure for forging automobile parts according to claim 1, characterized in that: The pushing mechanism (2) comprises a toggle rod (201), the top end of the toggle rod (201) is rotatably connected to the forging machine body (1), one end of the toggle rod (201) connected to the forging machine body (1) is connected and fixedly provided with a motor (202), the motor (202) is connected and fixedly provided with the forging machine body (1), the bottom end of the toggle rod (201) is slidably matched with a moving frame (203), a pushing rack (204) is connected and fixedly provided on the moving frame (203), the pushing rack (204) is slidably matched with the forging machine body (1), and one end of the pushing rack (204) is connected and fixedly provided with a transmission rack (205).

3. The finished product ejection structure for forging automobile parts according to claim 1, characterized in that: The lower surface of the material guide seat (3) is symmetrically structured and is fixedly provided with two positioning rings (301).

4. The finished product ejection structure for forging automobile parts according to claim 1, characterized in that: The transmission mechanism (4) comprises a universal joint (401), the universal joint (401) being rotatably connected to the material guide seat (3), one end of the universal joint (401) passing through the lower surface of the material guide seat (3) and extending to the upper side and being connected and fixedly provided with a transmission wheel (402), the transmission wheel (402) being meshed with a transmission rack (205) for transmission, and the other end of the universal joint (401) being connected and fixedly provided with a threaded rod (403).

5. The finished product ejection structure for forging automobile parts according to claim 4, characterized in that: A gear rack (404) is threadedly connected to the threaded rod (403), and a plurality of transmission teeth (405) are rotatably connected to the gear rack (404) in a linear structure. A spring (406) is fixedly connected to one end of the transmission tooth (405), and the other end of the spring (406) is fixedly connected to the gear rack (404).

6. The finished product ejection structure for forging automobile parts according to claim 1, characterized in that: A U-shaped pull frame (501) is slidably arranged on the transfer seat (5), and positioning rods (502) are fixedly arranged at both ends of one side of the U-shaped pull frame (501), and the positioning rods (502) are movably plugged into the positioning ring (301).

7. The finished product ejection structure for forging automobile parts according to claim 1, characterized in that: An electric push rod (601) is fixedly connected to the bottom end of the step frame (6), and the other end of the electric push rod (601) is fixedly connected to the transfer seat (5). A push handle (602) is fixedly connected to the step frame (6).

8. The finished product ejection structure for forging automobile parts according to claim 1, characterized in that: Both sides of the upper bottom end of the fixed column (7) are rotatably connected and fixedly provided with rollers (701), and the other end of the roller (701) is rotatably connected and provided with a slider (702), and the slider (702) is slidably matched with the transfer seat (5), and the roller (701) is slidably contacted with the step frame (6). A hydraulic rod (703) is connected and fixedly provided at the top end of the fixed column (7), and the output end of the hydraulic rod (703) extends into the fixed column (7) and is connected and fixedly provided with a plurality of conical blocks (704), and a plurality of push rods (705) are slidably matched through the fixed column (7), and a tension spring (706) is connected and fixedly provided on the push rod (705), and the other end of the tension spring (706) is connected and fixedly provided with the inner wall of the fixed column (7).

9. The finished product ejection structure for forging automobile parts according to claim 1, characterized in that: The upper surface of the material discharge seat (8) is annular in structure and is provided with a plurality of material discharge grooves (801), a material lifting plate (802) is slidably arranged in the material discharge groove (801), a connecting rod (803) is rotatably connected to the bottom end of the material lifting plate (802), a contact rod (804) is rotatably connected to the other end of the connecting rod (803), the contact rod (804) is slidably arranged with the material discharge seat (8), one end of the contact rod (804) is movably contacted with the top rod (705), and an annular rack (805) is fixedly connected to the lower surface of the material discharge seat (8).

10. The finished product ejection structure for forging automobile parts according to claim 1, characterized in that: The adjusting mechanism (9) comprises a worm (901), one end of the worm (901) being rotatably connected to a fixed column (7), the other end of the worm (901) being connected and fixedly provided with a one-way wheel (902), the one-way wheel (902) being meshingly transmission-arranged with a transmission tooth (405), one side of the worm (901) being meshingly transmission-arranged with a worm wheel (903), the worm wheel (903) being rotatably connected to the fixed column (7), an adjusting wheel (904) being connected and fixedly provided on the worm wheel (903), the adjusting wheel (904) being meshingly transmission-arranged with an annular rack (805).

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