Punching and necking mould for oil pipe

Abstract

The utility model relates to an oil pipe stamping necking mould which comprises a lower mould unit and a movement mechanism penetrating through the lower mould unit. The movement mechanism located above the lower die unit is connected with a power device through a pipe shrinking die handle. The movement mechanism respectively forms an upper operation space and a lower operation space of the mould above and below the lower die unit by taking the lower die unit as a boundary, and an oil pipe is arranged in the upper operation space above the lower die unit; the motion mechanism is driven to move up and down under the power action of the power device so as to realize necking stamping of the oil pipe; the original end machine procedure is converted into the punching necking procedure by utilizing the mould, and the mould adopting the necking mode is simple in structure principle, easy to operate and capable of reducing the working difficulty; stable positioning of the product is guaranteed in the machining process, and the surface roughness of the machined product can be guaranteed; mould parts are convenient to replace, the overall loss of the mould is reduced, the service life of the mould is prolonged, and therefore the product machining efficiency is improved.

Description

Technical Field

[0001] The utility model relates to a device for reducing the diameter of a pipe product, in particular to a die for punching and shrinking an oil pipe, and belongs to the field of pipe fitting production. Background Art

[0002] Fuel pipe joints are critical components in automotive manufacturing, their quality and stability directly impacting vehicle performance and safety. During production, these joints require a reduced diameter and reduced diameter process. Existing methods for reducing fuel pipe joints utilize a die for end-of-line molding. This method presents drawbacks such as high labor complexity, inconvenient die replacement, and low processing efficiency. Furthermore, the surface roughness of the finished product cannot be guaranteed, and the product dimensions are unstable during processing, ultimately increasing production costs. Utility Model Content

[0003] In view of the various technical difficulties in the prior art of oil pipe shrinking work, the purpose of the utility model is to provide an oil pipe punching and shrinking jig, which can be used to transform the original terminal machine process into a punching and shrinking process, greatly reducing the work difficulty and improving processing efficiency.

[0004] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is as follows: a mold for punching and shrinking a tubing, comprising: a lower die unit, a motion mechanism penetrating the lower die unit; the motion mechanism located above the lower die unit is connected to a power device via a shrinking die handle; the motion mechanism forms an upper running space and a lower running space of the mold above and below the lower die unit, respectively, with the lower die unit as a boundary; the tubing is installed in the upper running space above the lower die unit; the motion mechanism is driven by the power of the power device to move up and down, thereby achieving shrinking stamping of the tubing;

[0005] Furthermore, the power device adopts a press, which is matched and connected with the top of the tube shrinking die handle;

[0006] Furthermore, a positioning rod unit is provided in the upper running space of the tire;

[0007] Furthermore, the lower die unit comprises: a lower die with an internal cavity and a circular boss structure, and a die embedded in the lower die; the die has a T-shaped cross-section and an outer diameter that matches the inner diameter of the lower die; the die is engaged with the lower die so that the main body of the die is embedded in the cavity of the lower die, and the T-shaped extension of the die is placed on the upper surface of the edge of the cavity of the lower die; a variable diameter channel is opened in the center of the die, and the variable diameter channel runs through the entire height of the die from top to bottom, with the upper portion of the variable diameter channel being a large diameter area segment and the lower portion being a small diameter area segment, and the connection between the large diameter area segment and the small diameter area segment forms an inclined transition area;

[0008] Furthermore, the female mold which is mounted on the lower mold and is clamped to the lower mold is formed with a convex portion relative to the upper surface of the lower mold;

[0009] Furthermore, the moving mechanism includes: an upper plate, a push plate, a positioning push rod, a guide rod and a nut; the upper plate is connected to the shrink tube mold handle by bolts, and the upper plate outside the shrink tube mold handle is provided with a plurality of guide rod connecting holes, and the lower mold corresponding to the position of the guide rod connecting holes is provided with an equal number of lower mold guide rod connecting holes, and the push plate corresponding to the position of the lower mold guide rod connecting holes is provided with a corresponding number of push plate guide rod connecting holes; the guide rod passes through the push plate, the lower mold and the upper plate in sequence and is fixed above the upper plate by nuts, so that the moving mechanism is connected to the lower mold unit as a whole; the center of the push plate is connected to a positioning push rod extending upward by bolts, and a push plate is arranged under the lower mold. When installed, the upper end surface of the push plate is against the lower end surface of the lower mold, and the top end of the positioning push rod extends into the variable diameter channel of the female mold;

[0010] Furthermore, in the motion mechanism, the upper plate is fixed to the guide rod, the pusher plate is fixed to the guide rod, and the guide rod slides in the connecting hole of the lower die guide rod;

[0011] Furthermore, the maximum height of the positioning push rod extending into the die diameter-changing channel is slightly lower than the overall height of the die diameter-changing channel;

[0012] Furthermore, the positioning push rod is a straight rod with the same diameter at the top and bottom. The lower section of the positioning push rod is clearance-matched with the small-diameter section of the die variable diameter channel, and the upper section of the positioning push rod forms an annular accommodating gap with the large-diameter section of the die variable diameter channel. The accommodating gap is used to accommodate the oil pipe.

[0013] Furthermore, the female mold and the lower mold in the above-mentioned lower mold unit are of combined embedded design;

[0014] Furthermore, the positioning push rod and the push plate are a detachable combined structure, the bottom of the positioning push rod is a T-shaped structure and is provided with a bolt connection hole, and a T-shaped groove is formed on the push plate to match the T-shaped structure at the bottom of the positioning push rod, and the T-shaped groove is provided with a through hole for the bolt to pass through corresponding to the bolt hole position at the bottom of the positioning push rod;

[0015] Furthermore, the positioning rod unit is two positioning rods arranged horizontally at 180 degrees. The two positioning rods are arranged on the lower mold in an interlaced manner with the guide rods and are fixedly connected to the lower mold by bolts.

[0016] The core of this solution lies in the ingenious design of the positioning push rod in the mold motion mechanism. The positioning push rod is in different motion states during the product (oil pipe) loading and unloading processes and realizes different functions. That is, when the product is loaded, the positioning push rod and the die are used to form a product accommodating space. In this process, the positioning push rod plays the role of guiding and positioning the product, and at this time, a positioning rod is formed; in the unloading process, the role of the positioning push rod is to unload the product, and at this time, an unloading rod is formed.

[0017] The beneficial effects of the tubing shrinking jig using this solution are:

[0018] This jig is used to transform the original terminal machine process into a punching and shrinking process. The jig structure principle of this shrinking method is simple and easy to operate, which can reduce the difficulty of work; the product positioning is guaranteed to be stable during the processing, and the surface roughness of the product after processing can be guaranteed; the jig parts are easy to replace, which reduces the overall loss of the jig and increases the service life of the jig, thereby improving product processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural diagram of an embodiment of the oil pipe punching and compression mold of the utility model (the product is not installed).

[0020] Figure 2 for Figure 1 A partial cross-sectional view of .

[0021] Figure 3 This is a schematic diagram of the state where a die is placed into a product according to an embodiment of the utility model.

[0022] Figure 4 This is a cross-sectional view of the product being placed in the die.

[0023] Figure 5 This is a schematic diagram of the stamping state of an embodiment of the present utility model.

[0024] Figure 6 It is a cross-sectional view of the stamping state.

[0025] Figure 7 This is a schematic diagram of the material return state of an embodiment of the present utility model.

[0026] Figure 8 This is a cross-sectional view of the material being returned.

[0027] Figure 9 This is a schematic diagram of the finished product state of the oil pipe necking processing according to one embodiment of the present invention.

[0028] Figure 10 This is a cross-sectional view of the finished product of the oil pipe shrinkage processing.

[0029] Figure 11This is a schematic diagram of the assembly structure of the mold and workbench of the utility model.

[0030] In the figure, 1, tube shrinking die handle, 2, upper operating space, 3, lower operating space, 4, pipe fitting, 5, positioning rod, 6, lower die, 7, die;

[0031] 71. T-shaped extension platform of the die, 72. large diameter area, 73. small diameter area, 74. inclined transition area;

[0032] 8. Upper plate, 9. Push plate, 10. Positioning push rod, 11. Guide rod, 12. Nut, 13. Upper position of the accommodating space, 14. Workbench, 15. Press plate, 16. Bolt. DETAILED DESCRIPTION

[0033] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of specific embodiments of the present invention is provided in conjunction with the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] like Figure 1-10 The illustrated embodiment of a jig for punching and shrinking a tubing is shown, comprising: a lower die unit; a motion mechanism extending through the lower die unit; the motion mechanism located above the lower die unit is connected to a power unit via a tube shrinking die handle 1; the motion mechanism, with the lower die unit as the boundary, forms an upper operating space 2 and a lower operating space 3 of the jig above and below the lower die unit, respectively; a tubing 4 is mounted in the upper operating space 2 located above the lower die unit; the motion mechanism is driven up and down by the power of the power unit to achieve shrinkage punching of the tubing 4 (tubing);

[0035] The power device adopts a press, which is connected to the top of the tube shrinking mold handle 1 in a conventional manner. This part of the structure is omitted in the accompanying drawings.

[0036] A positioning rod unit is provided in the upper operating space 2 of the mold. The positioning rod unit comprises two positioning rods 5 arranged horizontally at 180 degrees. The two positioning rods 5 are arranged on the lower mold 6 in an interlaced manner with the guide rods 11 of the motion mechanism and are fixed to the lower mold 6 by bolts. The positioning rod unit is provided to control the length range of the tubing reduction area to prevent the tubing reduction area from not meeting the requirements due to an excessively long stamping stroke during the stamping process of the press.

[0037] The lower die unit comprises: a lower die 6 with an internal cavity and a circular boss structure, and a die 7 embedded in the lower die 6; the die 7 has a T-shaped cross-section and an outer diameter that matches the inner diameter of the lower die 6. The die 7 is engaged and snapped into the lower die 6 so that the main body of the die 7 is embedded in the cavity of the lower die 6, and the T-shaped extension 71 of the die is placed on the upper surface of the edge of the cavity position of the lower die 6; a reducing channel is provided in the center of the die 7, which runs through the entire height of the die 7 from top to bottom. The upper portion of the reducing channel is a large diameter section 72, and the lower portion is a small diameter section 73. The connection between the large diameter section 72 and the small diameter section 73 forms an inclined transition region 74; the internal shape of the reducing channel of the die 7 is used to form the outer contour of the oil pipe necking product;

[0038] The female mold 7 is mounted on the lower mold 6 and has a convex portion formed on the upper surface of the lower mold 6;

[0039] The moving mechanism includes: an upper plate 8, a push plate 9, a positioning push rod 10, a guide rod 11 and a nut 12; the upper plate 8 is connected to the shrinking tube mold handle 1 by bolts, and the upper plate 8 on the periphery of the shrinking tube mold handle 1 is provided with a plurality of guide rod connecting holes, and the lower mold 6 corresponding to the position of the guide rod connecting holes is provided with an equal number of lower mold guide rod connecting holes, and the push plate 9 corresponding to the position of the lower mold guide rod connecting holes is provided with a corresponding number of push plate guide rod connecting holes; the guide rod 11 passes through the push plate 9, the lower mold 6 and the upper plate 8 in sequence and is fixed above the upper plate 8 by nuts 12, so that the moving mechanism is connected to the lower mold unit as a whole; the center of the push plate 9 is connected with a positioning push rod 10 extending upward by bolts, and a push plate 9 is arranged under the lower mold 6. When installed, the upper end surface of the push plate 9 is against the lower end surface of the lower mold 6, and the top end of the positioning push rod 10 extends into the reducing channel of the die 7;

[0040] In the motion mechanism, the upper plate 8 is fixed to the guide rod 11, the push plate 9 is fixed to the guide rod 11, and the guide rod 11 slides in the connecting hole of the lower die guide rod; based on the above scheme, the lower die unit is used as a fixed reference, and when in use, it is fixedly connected to the workbench 14 through the lower die 6. The workbench 14 is provided with a mounting hole that matches the bottom specification of the lower die 6. The lower die 6 is installed in the mounting hole so that the lower surface of the circular boss on the upper part of the lower die 6 is stuck on the upper surface of the workbench 14. A pressing plate 15 is set on the upper surface of the circular boss of the lower die and a bolt 16 is used to achieve fixed connection with the workbench 14. The specific structure is as follows Figure 11 As shown; the guide rod 11 slides up and down in the connecting hole of the lower die guide rod, together with the upper plate 8 at the upper end of the guide rod 11 and the pusher plate 9 at the lower end thereof, and simultaneously; at the same time, the up and down movement of the pusher plate 9 causes the positioning pusher rod 10 connected to the pusher plate 9 to move along with it;

[0041] The limit height of the positioning push rod 10 extending into the variable diameter channel of the die is slightly lower than the overall height of the variable diameter channel of the die 7;

[0042] The positioning push rod 10 is a straight rod with the same diameter at the top and bottom. The lower section of the positioning push rod 10 is clearance-fitted with the small-diameter section 73 of the reducing channel of the die 7. The upper section of the positioning push rod 10 forms an annular receiving space with the large-diameter section 72 of the reducing channel of the die 7. The receiving space is used to receive the pipe 4 (oil pipe).

[0043] Based on the above solution, the wall thickness of the initially unreduced oil pipe is just enough to fit into the accommodation space between the positioning push rod 10 and the die 7, and the oil pipe is inserted from the upper opening position 13 of the accommodation space, so that the oil pipe is sleeved on the positioning push rod 10. At this time, the positioning push rod 10 plays a positioning and guiding role during the installation of the pipe 4, thereby ensuring the vertical state of the oil pipe during the stamping process and preventing the oil pipe from deflecting.

[0044] In this embodiment, the number of guide rods 11 in the motion mechanism is set to 4 and is evenly distributed throughout the mold to ensure the overall stability of the mold;

[0045] Preferably, the number of bolts for fixing the tube shrinking mold handle 1 to the upper plate 8 is set to 4;

[0046] The die 7 and the lower die 6 in the lower die unit are of a combined embedded design, which makes it easy to replace the die 7. In case of wear and tear of the die 7 or when oil pipes of different specifications need to be processed, the die specifications that match the die can be replaced, which has a certain degree of versatility.

[0047] The positioning push rod 10 and the push plate 9 are a detachable combined structure. The bottom of the positioning push rod 10 is a T-shaped structure and is provided with a bolt connection hole. A T-shaped groove is formed on the push plate 9 that is compatible with the T-shaped structure at the bottom of the positioning push rod 10. The T-shaped groove corresponds to the bolt hole position at the bottom of the positioning push rod 10 and is provided with a through hole for the bolt to pass through. During installation, the bottom of the positioning push rod 10 is embedded in the T-shaped groove of the push plate 9, and a bolt is screwed into the through hole at the bottom of the push plate 9 and connected to the bolt connection hole at the bottom of the positioning push rod 10, thereby realizing the installation of the push plate 9 and the positioning push rod 10. Based on the combined assembly design of the positioning push rod 10 and the push plate 9, the positioning push rod 10 can be easily replaced at any time.

[0048] The specific stamping method based on the above-mentioned structural mold includes the following steps:

[0049] 1) Product Installation

[0050] The punch connected to the tube shrinking die handle 1 at the top of the mold drives the motion mechanism to move upward. The upward movement of the motion mechanism causes the upper plate 8, each guide rod 11 and the push plate 9 connected to the guide rod 11 to move upward. During this movement process, the motion mechanism produces an upward displacement relative to the lower mold unit, thereby increasing the upper operating space 2 of the mold and making its space larger; the pipe 4 to be processed is placed in the die 7;

[0051] It should be noted that the height of the upper running space 2 is such that the pipe 4 can be placed into the die 7 at least from the height of the surface of the raised portion formed by the die 7 on the lower die 6. At the same time, the positioning pusher rod 10 in the motion mechanism moves along with the pusher plate 9 so that it is in a state of extending into the diameter-changing channel of the die 7, thereby forming a space for accommodating the pipe 4.

[0052] After the pipe 4 is placed in the reducing channel of the die, the lower end of the pipe 4 extends to the large diameter section 72 of the reducing channel of the die, close to the inclined transition area 74, and can only reach this position, so that the pipe 4 is sleeved on the upper end of the positioning push rod 10.

[0053] 2) Stamping

[0054] The punching machine drives the moving mechanism to move downward to punch the pipe 4. During the downward movement of the moving mechanism, the upper running space 2 of the jig gradually shrinks, while the lower running space 3 of the jig gradually expands, causing the pusher plate 9 to gradually move away from the lower die unit. Finally, the pipe 4 is pressed and formed in the variable diameter channel of the die 7, achieving the shrinkage of the pipe 4.

[0055] It should be noted that, during the initial downward stroke of the motion mechanism, the upper plate 8 does not exert a downward pressure on the pipe fitting 4. However, during this downward stroke of the motion mechanism, the pusher plate 9 moves downward, and the positioning pusher rod 10 moves downward along with it, thereby moving the positioning pusher rod 10 until its top end leaves the large-diameter section 72 of the reducing channel of the die 7 and reaches the small-diameter section 73 of the reducing channel. In other words, when the upper plate 8 of the motion mechanism presses down and exerts a force on the pipe fitting 4, the positioning pusher rod 10 has already moved to the small-diameter section 73 of the reducing channel of the die 7.

[0056] 3) Material return

[0057] The lower end of the punched pipe fitting 4 is pressed into the small diameter section area 73 of the reducing channel of the die 7. In this state, the diameter of the lower part of the pipe fitting 4 is the same as the diameter of the positioning push rod 10. The upward movement of the punching machine drives the moving mechanism to move upward, so that the top end face of the positioning push rod 10 is abutted against the lower end face of the pipe fitting 4 in the small diameter section area 73 of the reducing channel of the die 7, thereby pushing the pipe fitting 4 upward.

[0058] 4) Get the finished product

[0059] When the pipe fitting 4 in step 3) is pushed to the lower end face and leaves the small diameter area 73 of the reducing channel of the die 7 and is located in the large diameter area 72 of the reducing channel of the die 7, the pipe fitting 4 is supported manually, and the push plate 9 continues to move upward to a suitable position. It is appropriate that the pipe fitting 4 can be taken out at the height of the upper operating space of the mold, and then the pipe fitting 4 is taken out from the die 7 to complete the entire oil pipe punching and compression work; after the pipe fitting 4 is taken out, the push plate 9 moves up to the limit position, and when the upper end face of the push plate 9 is completely fitted with the lower end face of the lower die unit, the motion mechanism of the mold also returns to its original state; at this time, the next oil pipe can be processed, and the processing method repeats the above steps 1) to 4).

[0060] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0061] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0062] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0063] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0064] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

Claims

1. A tubing punching and compression jig, characterized in that: include: A lower die unit and a motion mechanism extending through the lower die unit; the motion mechanism located above the lower die unit is connected to a power device via a tube shrinking die handle; the motion mechanism forms an upper running space and a lower running space of the mold above and below the lower die unit, respectively, with the lower die unit as the boundary; the pipe fitting is installed in the upper running space above the lower die unit; the motion mechanism is driven up and down by the power of the power device to achieve tube shrinkage stamping; The lower die unit comprises: a lower die with an internal cavity and a circular boss structure, and a die embedded in the lower die; the die has a T-shaped cross-section and an outer diameter that matches the inner diameter of the lower die; the die is engaged with the lower die so that the main body of the die is embedded in the cavity of the lower die, and the T-shaped extension of the die is placed on the upper surface of the edge of the lower die cavity; a variable diameter channel is opened in the center of the die, and the variable diameter channel runs through the entire height of the die from top to bottom, with the upper portion of the variable diameter channel being a large diameter section and the lower portion being a small diameter section, and the junction between the large diameter section and the small diameter section forming an inclined transition area; The motion mechanism includes: an upper plate, a push plate, a positioning push rod, a guide rod and a nut; The guide rod passes through the push plate, the lower die and the upper plate in sequence and is fixed above the upper plate by a nut, so that the moving mechanism and the lower die unit are connected as a whole; the center of the push plate is connected to a positioning push rod extending upward by a bolt, and a push plate is arranged under the lower die. When installed, the upper end surface of the push plate is against the lower end surface of the lower die, and the top end of the positioning push rod extends into the variable diameter channel of the die; the positioning push rod is a straight rod body with the same upper and lower diameters, the lower section of the positioning push rod is clearance-matched with the small diameter area section of the die variable diameter channel, and the upper section of the positioning push rod and the large diameter area section of the die variable diameter channel form an annular accommodating gap; the accommodating gap accommodates the oil pipe; The positioning push rod forms a product accommodating space with the die when the product is loaded, thereby becoming a positioning rod; the positioning push rod forms a material return rod during the product return process.

2. The oil pipe punching and compression mold according to claim 1, characterized in that: The power device adopts a press, which is matched and connected with the top of the tube shrinking die handle.

3. The oil pipe punching and compression mold according to claim 1, characterized in that: The female die which is mounted on the lower die and clamped thereon is provided with a convex portion relative to the upper surface of the lower die.

4. The oil pipe punching and compression mold according to claim 1, characterized in that: The upper plate is connected to the tube reduction mold handle by bolts. A plurality of guide rod connection holes are provided on the upper plate outside the tube reduction mold handle. An equal number of lower mold guide rod connection holes are provided on the lower mold corresponding to the positions of the guide rod connection holes. A corresponding number of pusher plate guide rod connection holes are provided on the pusher plate corresponding to the positions of the lower mold guide rod connection holes.

5. The oil pipe punching and compression mold according to claim 4, characterized in that: In the motion mechanism, the upper plate is fixed to the guide rod, the push plate is fixed to the guide rod, and the guide rod slides in the connecting hole of the lower die guide rod.

6. The oil pipe punching and compression mold according to claim 1, characterized in that: The maximum height of the positioning push rod extending into the die diameter-changing channel is lower than the overall height of the die diameter-changing channel.

7. The oil pipe punching and compression mold according to claim 1, characterized in that: The concave die and the lower die in the lower die unit are of combined embedded design.

8. The oil pipe punching and compression mold according to claim 1, characterized in that: The positioning push rod and the push plate are a detachable combination structure. The bottom of the positioning push rod is a T-shaped structure and is provided with a bolt connection hole. A T-shaped groove is formed on the push plate to match the T-shaped structure at the bottom of the positioning push rod. The T-shaped groove corresponds to the bolt hole position at the bottom of the positioning push rod and is provided with a through hole for the bolt to pass through.

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