Powder metallurgy hydraulic machine

Abstract

The invention relates to the technical field of powder metallurgy hydraulic machines, in particular to a powder metallurgy hydraulic machine which comprises a hydraulic machine body, a workbench is fixedly installed in the hydraulic machine body, a gear die is fixedly arranged on the workbench in a penetrating connection mode, a pressurizing mechanism is rotationally connected to a movable frame, and an adjusting seat is rotationally connected to the pressurizing mechanism. A powder pre-pressing plate is arranged on the lower side of the adjusting seat, when powder metallurgy is carried out on the hydraulic machine body, the powder pre-pressing plate is driven through the pressurizing mechanism, pre-pressurization is carried out after powder of each layer is added, gaps between the powder of each layer can be effectively reduced, the contact degree between powder particles is improved, the subsequent forming process is facilitated, and the production efficiency is improved. Each layer of powder can be compacted under pre-pressurization, the layer-by-layer compaction process is favorable for improving the density of a final workpiece, and the higher density means that the mechanical properties (such as strength, hardness, wear resistance and the like) of the part can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy hydraulic presses, and in particular to a powder metallurgy hydraulic press. Background Art

[0002] Powder metallurgy hydraulic press is a kind of equipment specially used in powder metallurgy forming process, which is mainly used to press metal powder or other powder materials into parts of specific shapes. The hydraulic press provides high pressure through the hydraulic system to compress the powder to achieve the required density, shape and performance. Powder metallurgy hydraulic press is widely used in the production of automotive parts, mechanical parts, electronic components, tools, medical equipment, etc.

[0003] The working principle of the powder metallurgy hydraulic press is based on the pressure of the hydraulic system. The specific steps are as follows:

[0004] Powder filling: First, metal powder or other powder materials are evenly filled into the mold, which usually consists of an upper mold and a lower mold. Hydraulic pressurization: The hydraulic system transmits high pressure to the upper mold, and the powder is compacted by the action of the piston. This process usually applies a large pressure (hundreds to thousands of tons) so that the powder particles are tightly combined and the shape is fixed. Molding: During the pressing process, the powder is evenly compacted into the desired shape, which can be round, square, special-shaped, etc., depending on the design of the mold.

[0005] When the existing powder metallurgy hydraulic press is used, when the powder is pushed directly into the mold, the distribution and filling of the powder are easily affected by the operation mode and powder characteristics (such as particle size, shape, fluidity, etc.), resulting in uneven filling. Uneven powder filling will lead to uneven density during the molding process, forming pores, cracks or loose structures, and ultimately affecting the quality of the product (such as strength, wear resistance, etc.). Especially when producing gears, uneven filling will aggravate its defects, thereby affecting the quality of the gears, causing safety problems during use and service life of the gears.

[0006] In summary, the prior art lacks a technology for adding powder in layers and performing pre-pressurization on a powder metallurgy hydraulic press. Summary of the invention

[0007] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a powder metallurgy hydraulic press.

[0008] In order to achieve the above purpose, the technical solution adopted by the present invention is: a powder metallurgy hydraulic press, including a hydraulic press body, a workbench is fixedly installed on the hydraulic press body, a gear mold is fixedly connected to the workbench, a mobile frame is slidably provided on one side of the workbench, a powder feeding seat is slidably provided on the mobile frame, a knocking mechanism is rotatably connected on the powder feeding seat, a pressurizing mechanism is rotatably connected on the mobile frame, an adjusting seat is rotatably connected on the pressurizing mechanism, and a powder pre-pressing plate is provided on the lower side of the adjusting seat.

[0009] Preferably, a hydraulic rod is connected and fixedly arranged at one end of the movable frame, the hydraulic rod is connected and fixedly arranged at the workbench, and a fixed rack is connected and fixedly arranged at one side of the movable frame.

[0010] Preferably, the bottom surface of the powder loading seat is slidably matched with the top surface of the workbench, an electric push rod is fixedly connected to one side of the powder loading seat, the other end of the electric push rod is fixedly connected to the movable frame, a material guide pipe is connected and fixedly provided through the top of the powder loading seat, and an extrusion plate is fixedly provided on the material guide pipe.

[0011] Preferably, the knocking mechanism includes a universal joint, which is rotatably connected to the material guide tube, one end of the universal joint is connected and fixedly provided with a transmission wheel, the transmission wheel is meshing and transmitting with a fixed rack, the other end of the universal joint is connected and fixedly provided with an incomplete bevel gear, both sides of the incomplete bevel gear are movably meshing and transmitting with bevel gears, a knocking rod is connected and fixedly provided between the two bevel gears, the knocking rod is rotatably connected to the powder loading seat, and both ends of the knocking rod are movably contacted with the upper surface of the powder loading seat.

[0012] Preferably, the pressurizing mechanism includes two connecting rod groups, one end of the connecting rod group is rotatably connected to the movable frame, and the other end of the connecting rod group is rotatably connected to the adjustment seat, one end of the connecting rod group connected to the movable frame is connected and fixedly provided with a rotating shaft, the other end of the rotating shaft is connected and fixedly provided with an adjusting wheel, the adjusting wheel is meshingly provided with an adjusting rack, one end of the adjusting rack is slidably matched with the movable frame, one end of the adjusting rack is connected and fixedly provided with a conical rod, and the outer wall of the conical rod is slidably contacted with the extrusion plate.

[0013] Preferably, a transmission rod is rotatably connected to the adjustment seat, an adjustment groove is provided on the outer wall of the transmission rod, a worm wheel is fixedly connected to the top of the transmission rod, a worm is meshingly transmitted with a worm on one side of the worm wheel, the worm is rotatably connected to the adjustment seat, a tension spring A is fixedly connected to the adjustment seat, and the other end of the tension spring A is fixedly connected to the movable frame.

[0014] Preferably, one end of the worm is connected and fixedly provided with a meshing wheel, one side of the meshing wheel is provided with a gear rack, the gear rack is connected and fixedly provided with a movable rack, a plurality of meshing teeth are rotatably connected and provided with a linear structure on the gear rack, one end of the meshing teeth is connected and fixedly provided with a spring A, and the other end of the spring A is connected and fixedly provided with an inner wall of the gear rack.

[0015] Preferably, the powder pre-pressing plate is arranged in a tooth-shaped structure, the outer wall of the powder pre-pressing plate is slidingly matched with the inner wall of the gear mold, an adjustment frame is slidingly matched on the powder pre-pressing plate, and springs B are sleeved on the outer walls at both ends of the upper side of the powder pre-pressing plate.

[0016] Preferably, one side of the upper end of the adjustment frame is slidably matched with the adjustment seat, a tension spring B is connected and fixedly provided on the adjustment frame, the other end of the tension spring B is connected and fixedly provided with the adjustment seat, and a guide rod is connected and fixedly provided on the other side of the upper end of the adjustment frame, and the guide rod is slidably matched with the inner wall of the adjustment groove.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. When the hydraulic press body is subjected to powder metallurgy, the powder pre-pressing plate is driven by the pressurizing mechanism. Pre-pressurization is performed after each layer of powder is added. This can effectively reduce the gaps between each layer of powder and improve the contact between powder particles, which is helpful for the subsequent forming process. Each layer of powder will be compacted under pre-pressurization. This layer-by-layer compaction process helps to increase the density of the final workpiece. Higher density means that the mechanical properties of the parts (such as strength, hardness, wear resistance, etc.) can be effectively improved.

[0019] 2. When the hydraulic press body is subjected to powder metallurgy, powder is added in layers through the powder feeding seat. The amount of powder added each time is relatively small, which can be more evenly distributed in the mold, helping to avoid gaps or uneven areas during the powder filling process, ensuring that the final pressed parts have a high density, and avoiding adding a large amount of powder at one time, which may cause uneven powder filling or accumulation and collapse. Layered addition can be used to gradually fill the powder and reduce this risk;

[0020] 3. By arranging a knocking mechanism on the powder loading seat, when the powder loading seat adds powder to the gear die, the knocking rod can continuously knock on the powder loading seat, so that the powder in the powder loading seat can completely fall into the gear die, reducing the adhesion of powder to the powder loading seat and ensuring the accuracy of the feeding amount. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a powder metallurgy hydraulic press of the present invention;

[0022] Figure 2It is a schematic diagram of a partial structure of a powder metallurgy hydraulic press of the present invention when not loading materials;

[0023] Figure 3 It is a schematic diagram of a partial structure of a powder metallurgy hydraulic press of the present invention when loading materials;

[0024] Figure 4 It is a schematic diagram of the structure of a movable frame of a powder metallurgy hydraulic press of the present invention;

[0025] Figure 5 It is a partial cross-sectional schematic diagram of a powder feeding seat structure of a powder metallurgy hydraulic press of the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of a knocking mechanism of a powder metallurgy hydraulic press of the present invention;

[0027] Figure 7 It is a schematic structural diagram of a pressurizing mechanism of a powder metallurgy hydraulic press of the present invention;

[0028] Figure 8 It is a schematic diagram of the structure of an adjustment seat of a powder metallurgy hydraulic press according to the present invention;

[0029] Fig. 9 The figure is a schematic diagram of the structure of a powder pre-pressing plate of a powder metallurgy hydraulic press according to the present invention.

[0030] The following are marked in the figure: 1, hydraulic press body; 2, workbench; 3, gear mold; 4, mobile frame; 5, powder loading seat; 6, knocking mechanism; 7, pressurizing mechanism; 8, adjustment seat; 9, powder pre-pressing plate; 401, hydraulic rod; 402, fixed rack; 501, electric push rod; 502, guide pipe; 503, extrusion plate; 601, universal joint; 602, transmission wheel; 603, incomplete bevel gear; 604, bevel gear; 60 5. Knocking rod; 701. Connecting rod assembly; 702. Rotating shaft; 703. Adjusting wheel; 704. Adjusting rack; 705. Conical rod; 801. Transmission rod; 802. Adjusting slot; 803. Worm wheel; 804. Worm; 805. Tension spring A; 806. Meshing wheel; 807. Gear rack; 808. Meshing teeth; 809. Spring A; 901. Adjusting rack; 902. Spring B; 903. Tension spring B; 904. Guide rod. DETAILED DESCRIPTION

[0031] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art may think of other obvious variations.

[0032] like Figure 1-Figure 9A powder metallurgy hydraulic press shown in the figure comprises a hydraulic press body 1, a workbench 2 is fixedly installed in the hydraulic press body 1, a gear die 3 is fixedly connected to the workbench 2, a moving frame 4 is slidably provided on one side of the workbench 2, a powder feeding seat 5 is slidably provided on the moving frame 4, a knocking mechanism 6 is rotatably connected to the powder feeding seat 5, a pressurizing mechanism 7 is rotatably connected to the moving frame 4, an adjusting seat 8 is rotatably connected to the pressurizing mechanism 7, and a powder pre-pressing plate 9 is provided on the lower side of the adjusting seat 8.

[0033] like Figure 4 As shown, a hydraulic rod 401 is fixedly connected to one end of the mobile frame 4, and the hydraulic rod 401 is fixedly connected to the workbench 2, and a fixed rack 402 is fixedly connected to one side of the mobile frame 4. The hydraulic rod 401 drives the mobile frame 4 to move, so that the powder pre-pressing plate 9 is located directly above the gear die 3.

[0034] like Figure 5 As shown, the bottom surface of the powder loading seat 5 is slidably matched with the top surface of the workbench 2, an electric push rod 501 is connected and fixedly arranged on one side of the powder loading seat 5, and the other end of the electric push rod 501 is connected and fixedly arranged with the moving frame 4, and a guide pipe 502 is connected and fixedly arranged on the top of the powder loading seat 5, and an extrusion plate 503 is connected and fixedly arranged on the guide pipe 502. The metal powder is injected into the powder loading seat 5 by the guide pipe 502, and then the electric push rod 501 is used to drive the powder loading seat 5 to move above the gear mold 3.

[0035] like Figure 6 As shown, the knocking mechanism 6 includes a universal joint 601, which is rotatably connected to the guide tube 502, one end of the universal joint 601 is connected and fixedly provided with a transmission wheel 602, the transmission wheel 602 is meshing and transmission-arranged with the fixed rack 402, the other end of the universal joint 601 is connected and fixedly provided with an incomplete bevel gear 603, both sides of the incomplete bevel gear 603 are movably meshing and transmission-arranged with bevel gears 604, a knocking rod 605 is connected and fixedly provided between the two bevel gears 604, the knocking rod 605 is rotatably connected to the powder loading seat 5, and both ends of the knocking rod 605 are movably contacted with the upper surface of the powder loading seat 5. Under the action of the fixed rack 402, the transmission wheel 602 can rotate, so that the transmission wheel 602 drives the connected universal joint 601 to rotate, and the universal joint 601 drives the incomplete bevel gear 603 to rotate. At this time, the incomplete bevel gear 603 will respectively engage with the two bevel gears 604 in turn, and at this time, the knocking rod 605 connected to the two bevel gears 604 will be driven to rotate forward and reverse, so that the knocking rod 605 knocks on the powder loading seat 5.

[0036] like Figure 7As shown, the pressurizing mechanism 7 includes two connecting rod groups 701, one end of the connecting rod group 701 is rotatably connected to the moving frame 4, and the other end of the connecting rod group 701 is rotatably connected to the adjusting seat 8, one end of the connecting rod group 701 connected to the moving frame 4 is connected and fixedly provided with a rotating shaft 702, and the other end of the rotating shaft 702 is connected and fixedly provided with an adjusting wheel 703, and an adjusting rack 704 is meshingly provided on the adjusting wheel 703. One end of the adjusting rack 704 is slidably matched with the moving frame 4, and one end of the adjusting rack 704 is connected and fixedly provided with a tapered rod 705, and the outer wall of the tapered rod 705 is slidably contacted with the extrusion plate 503. Under the action of the fixed rack 402, the transmission wheel 602 can rotate, so that the transmission wheel 602 drives the connected universal joint 601 to rotate, and the universal joint 601 drives the incomplete bevel gear 603 to rotate. At this time, the incomplete bevel gear 603 will respectively engage with the two bevel gears 604 in turn, and at this time, the knocking rod 605 connected to the two bevel gears 604 will be driven to rotate forward and reverse, so that the knocking rod 605 knocks on the powder loading seat 5.

[0037] like Figure 8 As shown, a transmission rod 801 is rotatably connected to the adjustment seat 8, an adjustment slot 802 is provided on the outer wall of the transmission rod 801, a worm wheel 803 is fixedly connected to the top of the transmission rod 801, a worm 804 is meshingly driven on one side of the worm wheel 803, the worm 804 is rotatably connected to the adjustment seat 8, a tension spring A805 is fixedly connected to the adjustment seat 8, and the other end of the tension spring A805 is fixedly connected to the moving frame 4. When the extrusion plate 503 does not contact the tapered rod 705, the adjustment seat 8 will be driven to move upward under the action of the tension spring A805.

[0038] One end of the worm 804 is connected and fixedly provided with a meshing wheel 806, one side of the meshing wheel 806 is provided with a gear rack 807, the gear rack 807 is connected and fixedly provided with the movable frame 4, and a plurality of meshing teeth 808 are rotatably connected and provided in a linear structure on the gear rack 807, one end of the meshing tooth 808 is connected and fixedly provided with a spring A809, and the other end of the spring A809 is connected and fixedly provided with the inner wall of the gear rack 807. Under the action of spring A809, meshing teeth 808 are driven to mesh with meshing wheel 806, thereby driving worm 804 to rotate, so that worm 804 drives transmission rod 801 connected to worm wheel 803 to rotate, so that transmission rod 801 drives adjustment frame 901 connected to guide rod 904 to move up intermittently through adjustment slot 802, so that powder pre-pressing plate 9 moves up a distance after pressurization once, which is convenient for the next pressurization. When guide rod 904 moves to the linear structure position of adjustment slot 802, under the action of tension spring B903, powder pre-pressing plate 9 is driven to reset. Adjustment slot 802 is composed of two parts: a linear part and a spiral part.

[0039] like Fig. 9As shown, the powder pre-pressing plate 9 is arranged in a tooth-shaped structure, the outer wall of the powder pre-pressing plate 9 is slidingly matched with the inner wall of the gear mold 3, an adjustment frame 901 is slidingly matched on the powder pre-pressing plate 9, and the outer walls at both ends of the upper side of the powder pre-pressing plate 9 are sleeved with springs B902.

[0040] One side of the upper end of the adjustment frame 901 is slidably matched with the adjustment seat 8, a tension spring B903 is connected and fixedly set on the adjustment frame 901, and the other end of the tension spring B903 is connected and fixedly set with the adjustment seat 8, and a guide rod 904 is connected and fixedly set on the other side of the upper end of the adjustment frame 901, and the guide rod 904 is slidably matched with the inner wall of the adjustment groove 802.

[0041] Working principle: When powder metallurgy of gears is required, the hydraulic rod 401 is first used to drive the mobile frame 4 to move so that the powder pre-pressing plate 9 is located directly above the gear die 3, and then the guide tube 502 is used to inject metal powder into the powder loading seat 5, and then the electric push rod 501 is used to drive the powder loading seat 5 to move above the gear die 3 so that the powder can fall into the gear die 3;

[0042] When the powder loading seat 5 moves to the top of the gear die 3, the fixed rack 402 can make the transmission wheel 602 rotate, so that the transmission wheel 602 drives the connected universal joint 601 to rotate, so that the universal joint 601 drives the incomplete bevel gear 603 to rotate, and the incomplete bevel gear 603 will mesh with the two bevel gears 604 in turn, and the knocking rod 605 connected to the two bevel gears 604 will be driven to rotate forward and reverse, so that the knocking rod 605 knocks on the powder loading seat 5, so that the powder attached to the inner wall of the powder loading seat 5 can fall completely into the gear die 3;

[0043] When a layer of powder is added to the powder loading seat 5, when the powder loading seat 5 moves, the extrusion plate 503 on the guide tube 502 will contact the tapered rod 705, so that the adjustment rack 704 connected to the two tapered rods 705 moves, and at this time the adjustment rack 704 will drive the rotating shaft 702 connected to the adjusting wheel 703 to rotate, so that the rotating shaft 702 drives the connected connecting rod group 701 to rotate, so that the connecting rod group 701 drives the adjusting seat 8 to move downward, and at this time the powder pre-pressing plate 9 can be inserted into the gear die 3 to pre-press the powder, and the pressing force is small to compact the powder;

[0044] Then, when the extrusion plate 503 does not contact the tapered rod 705, the adjustment seat 8 will be driven to move up under the action of the tension spring A805, so that the powder pre-pressing plate 9 will move up and reset. At this time, under the action of the spring A809, the meshing tooth 808 will be driven to mesh with the meshing wheel 806, thereby driving the worm 804 to rotate, so that the worm 804 drives the transmission rod 801 connected to the worm wheel 803 to rotate, so that the transmission rod 801 passes through the opened adjustment groove 802, and drives the adjustment frame 901 connected to the guide rod 904 to move up intermittently, so that the powder pre-pressing plate 9 will move up a distance after being pressurized once, which is convenient for the next pressurization. When the guide rod 904 moves to the linear structure position of the adjustment groove 802, the powder pre-pressing plate 9 will be reset under the action of the tension spring B903, which is convenient for the powder metallurgy of the next gear.

[0045] After a certain amount of metal powder is added to the gear mold 3 in layers for multiple times, the hydraulic rod 401 is used to drive the movable frame 4 to reset, and the metal powder in the gear mold 3 is pressurized by the hydraulic press body 1, so that the gear can be pressurized.

[0046] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only describe the principles of the present invention. The present invention may be subject to various changes and improvements without departing from the spirit and scope of the present invention. These changes and improvements fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the attached claims and their equivalents.

Claims

1. A powder metallurgy hydraulic press, comprising a hydraulic press body (1), characterized in that: A workbench (2) is fixedly installed in the hydraulic press body (1), a gear die (3) is fixedly connected to and penetrated on the workbench (2), a movable frame (4) is slidably provided on one side of the workbench (2), a powder loading seat (5) is slidably provided on the movable frame (4), a knocking mechanism (6) is rotatably connected to the powder loading seat (5), a pressurizing mechanism (7) is rotatably connected to the movable frame (4), an adjusting seat (8) is rotatably connected to the pressurizing mechanism (7), and a powder pre-pressing plate (9) is provided on the lower side of the adjusting seat (8).

2. A powder metallurgy hydraulic press according to claim 1, characterized in that: A hydraulic rod (401) is fixedly connected to one end of the movable frame (4), and the hydraulic rod (401) is fixedly connected to the workbench (2). A fixed rack (402) is fixedly connected to one side of the movable frame (4).

3. A powder metallurgy hydraulic press according to claim 1, characterized in that: The bottom surface of the powder loading seat (5) is slidably matched with the top surface of the workbench (2); an electric push rod (501) is fixedly connected to one side of the powder loading seat (5); the other end of the electric push rod (501) is fixedly connected to the movable frame (4); a material guide tube (502) is passed through the top of the powder loading seat (5) and fixedly connected; an extrusion plate (503) is fixedly connected to the material guide tube (502).

4. The powder metallurgy hydraulic press according to claim 1, characterized in that: The knocking mechanism (6) comprises a universal joint (601), wherein the universal joint (601) is rotatably connected to the material guide tube (502), one end of the universal joint (601) is connected and fixedly provided with a transmission wheel (602), the transmission wheel (602) is meshed and transmitted with a fixed rack (402), the other end of the universal joint (601) is connected and fixedly provided with an incomplete bevel gear (603), both sides of the incomplete bevel gear (603) are movably meshed and transmitted with bevel gears (604), a knocking rod (605) is connected and fixedly provided between the two bevel gears (604), the knocking rod (605) is rotatably connected to the powder loading seat (5), and both ends of the knocking rod (605) are movably contacted with the upper surface of the powder loading seat (5).

5. The powder metallurgy hydraulic press according to claim 1, characterized in that: The pressurizing mechanism (7) comprises two connecting rod groups (701), one end of the connecting rod group (701) is rotatably connected to the movable frame (4), and the other end of the connecting rod group (701) is rotatably connected to the adjusting seat (8); one end of the connecting rod group (701) connected to the movable frame (4) is connected and fixedly provided with a rotating shaft (702); the other end of the rotating shaft (702) is connected and fixedly provided with an adjusting wheel (703); an adjusting rack (704) is meshingly provided on the adjusting wheel (703); one end of the adjusting rack (704) is slidably matched with the movable frame (4); one end of the adjusting rack (704) is connected and fixedly provided with a tapered rod (705); and the outer wall of the tapered rod (705) is slidably contacted with the extrusion plate (503).

6. The powder metallurgy hydraulic press according to claim 1, characterized in that: A transmission rod (801) is provided on the adjustment seat (8) for rotational connection, an outer wall of the transmission rod (801) is provided with an adjustment groove (802), a worm wheel (803) is fixedly provided at the top end of the transmission rod (801), a worm (804) is provided on one side of the worm wheel (803) for meshing transmission, the worm (804) is rotationally connected to the adjustment seat (8), a tension spring A (805) is fixedly provided on the adjustment seat (8), and the other end of the tension spring A (805) is fixedly provided with the movable frame (4).

7. A powder metallurgy hydraulic press according to claim 6, characterized in that: One end of the worm (804) is connected and fixedly provided with a meshing wheel (806), one side of the meshing wheel (806) is provided with a gear rack (807), the gear rack (807) is connected and fixedly provided with a movable frame (4), a plurality of meshing teeth (808) are rotatably connected and provided on the gear rack (807) in a linear structure, one end of the meshing teeth (808) is connected and fixedly provided with a spring A (809), and the other end of the spring A (809) is connected and fixedly provided with an inner wall of the gear rack (807).

8. The powder metallurgy hydraulic press according to claim 1, characterized in that: The powder pre-pressing plate (9) is arranged in a tooth-shaped structure, the outer wall of the powder pre-pressing plate (9) is arranged to slide with the inner wall of the gear mold (3), an adjustment frame (901) is arranged to slide on the powder pre-pressing plate (9), and springs B (902) are sleeved on the outer walls at both ends of the upper side of the powder pre-pressing plate (9).

9. The powder metallurgy hydraulic press according to claim 8, characterized in that: One side of the upper end of the adjustment frame (901) is slidably matched with the adjustment seat (8), a tension spring B (903) is connected and fixedly arranged on the adjustment frame (901), the other end of the tension spring B (903) is connected and fixedly arranged with the adjustment seat (8), and a guide rod (904) is connected and fixedly arranged on the other side of the upper end of the adjustment frame (901), and the guide rod (904) is slidably matched with the inner wall of the adjustment groove (802).

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