Tractor gearbox shift fork fork milling machine fixture and use method thereof

Abstract

The invention discloses a tractor gearbox fork fork milling machine fixture and a method for using the same, comprising: a positioning mandrel and a fork clamping unit, wherein the positioning mandrel is suitable for passing through the inner hole of the fork to limit the inner hole of the fork. The fork clamping unit comprises a left limit clamping assembly and a right limit clamping assembly which are suitable for respectively limiting and clamping the left fork and the right fork of the fork; a concave area corresponding to the fork fork is formed in the left limit clamping assembly and the right limit clamping assembly.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, and in particular to a tractor gearbox shift fork fork milling machine fixture and a use method thereof. Background Art

[0002] See also Figure 1 and Figure 2 As shown, the tractor gearbox fork workpiece is an irregular structure as a whole, including a perforated portion and two fork heads connected to the perforated portion, wherein a fork mouth portion is formed between the two fork heads. Therefore, for the entire tractor gearbox fork workpiece, the perforated portion, the two fork heads and the fork mouth portion of the fork need to be limited in order to effectively limit and fix the entire fork. Based on the irregular shape of the entire fork workpiece, the rapid limit fixation of the fork workpiece has become a difficulty in the fixture design. Summary of the invention

[0003] The first object of the present invention is to provide a tractor gearbox shift fork fork milling machine fixture to solve the technical problem of fast clamping and limiting the shift fork workpiece.

[0004] The second object of the present invention is to provide a method for using a tractor gearbox shift fork fork milling machine fixture to solve the technical problem of fast clamping and limiting the shift fork workpiece.

[0005] The tractor gearbox shift fork fork milling machine fixture of the present invention is realized in this way:

[0006] A tractor gearbox shift fork fork milling machine fixture, comprising:

[0007] A positioning mandrel, wherein the positioning mandrel is adapted to pass through the inner hole portion of the shift fork to limit the inner hole portion of the shift fork;

[0008] A fork clamping unit, the fork clamping unit comprises a left limit clamping assembly and a right limit clamping assembly which are suitable for respectively limiting and clamping the left fork and the right fork of the shift fork; a recessed area corresponding to the fork mouth of the shift fork is formed in the left limit clamping assembly and the right limit clamping assembly.

[0009] In a preferred embodiment of the present invention, the positioning mandrel and the left limit clamping assembly and the right limit clamping assembly are all arranged on a supporting frame; and

[0010] A positioning mandrel is respectively provided on the front and rear end surfaces of the support frame; the left limit clamping assembly and the right limit clamping assembly are both located at the top end of the support frame;

[0011] The left limit clamping assembly and the right limit clamping assembly are located above the positioning mandrel; and

[0012] The positioning mandrel is located in the middle area formed by the left limiting clamping assembly and the right limiting clamping assembly.

[0013] In a preferred embodiment of the present invention, the left limiting clamping assembly and the right limiting clamping assembly are symmetrically arranged.

[0014] In a preferred embodiment of the present invention, the left limit clamping assembly and the right limit clamping assembly each include a fixing seat fixedly arranged at the top end of the supporting frame, a ball stud penetrating the fixing seat, a first pressing plate and a second pressing plate sleeved on the ball stud and respectively located at both sides of the fixing seat, and a first supporting plate and a second supporting plate respectively arranged on the side end surfaces of the fixing seat facing the first pressing plate and the second pressing plate; a limiting area suitable for the fork head of the limit shift fork is distributed and formed between the first supporting plate and the first pressing plate, and between the second supporting plate and the second pressing plate;

[0015] The first support plate and the second support plate are symmetrically arranged relative to the fixing seat; and the first support plate and the second support plate are located on a portion of the fixing seat near the recessed area; and

[0016] The ball head fixing end of one end of the ball stud extends out of the second pressure plate away from the fixing seat; and a spherical shoulder nut is sleeved on the portion of the ball stud extending out of the first pressure plate away from the fixing seat.

[0017] In a preferred embodiment of the present invention, a spring is provided on the outer sleeve of the ball stud; the spring passes through the fixing seat, and the two axial ends of the spring respectively abut between the ball head fixing end of the ball stud and the spherical shoulder nut.

[0018] In a preferred embodiment of the present invention, a flat washer is provided between the end of the spring and the spherical shoulder nut.

[0019] In a preferred embodiment of the present invention, a first adjustment support column is provided at a portion away from the recessed area between the first pressing plate and the fixing seat; a second adjustment support column is provided at a portion away from the recessed area between the second pressing plate and the fixing seat;

[0020] The first support plate and the second support plate are symmetrically arranged relative to the fixing seat; and the first support plate and the second support plate are located on a portion of the fixing seat near the recessed area.

[0021] In a preferred embodiment of the present invention, one end of the first adjustment support column is threadedly connected to the fixing seat, and the other end of the first adjustment support column is suitable for abutting the first pressing plate; a first limiting groove is provided on the end surface of the first pressing plate facing the first adjustment support column;

[0022] One end of the second adjustment support column is threadedly connected to the fixing seat, and the other end of the second adjustment support column is suitable for abutting the second pressure plate; a second limiting groove is provided on the end surface of the second pressure plate facing the second adjustment support column;.

[0023] In a preferred embodiment of the present invention, the tractor gearbox shift fork fork milling machine fixture further comprises a positioning member adapted to be loaded in the recessed area;

[0024] The positioning member comprises a body adapted to be embedded in the recessed area, and a wing portion integrally connected to the body and extending out of the recessed area and adapted to be used for the caliper at the fork of the shift fork;

[0025] The end surfaces of the wing portion facing the pair of fork heads of the shift fork are arc surfaces; and

[0026] When the fork head of the shift fork is placed in the limiting area, a pair of fork heads of the shift fork abut against both side ends of the wing portion respectively.

[0027] The use method of the tractor gearbox shift fork fork milling machine fixture of the present invention is achieved as follows:

[0028] A method for using a tractor gearbox fork fork milling machine fixture, comprising:

[0029] Step S1: The positioning mandrel passes through the inner hole of the shift fork to position the inner hole of the shift fork;

[0030] Step S2: The two fork heads of the shift fork are respectively inserted into the left limit clamping assembly and the right limit clamping assembly;

[0031] Step S3: embedding the positioning member into the recessed area so that a pair of fork heads of the shift fork contact the two side ends of the wing portion of the positioning member;

[0032] Step S4: Clamp a pair of fork heads of the shift fork by the left limit clamping assembly and the right limit clamping assembly to remove the positioning member from the recessed area.

[0033] By adopting the above technical scheme, the present invention has the following beneficial effects: the tractor gearbox shift fork fork milling machine fixture and the use method thereof of the present invention can simultaneously limit and fix the inner hole portion of the shift fork and a pair of fork heads through the coordinated use of the positioning mandrel and the left limit clamping assembly and the right limit clamping assembly. In this process, it is only necessary to operate the left limit clamping assembly and the right limit clamping assembly to clamp the pair of fork heads to achieve the clamping and fixing of the entire shift fork, and the overall process operation is convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the shift fork from the first perspective;

[0035] Figure 2 It is a structural schematic diagram of the shift fork from a second perspective;

[0036] Figure 3 It is a three-dimensional structural schematic diagram of the tractor gearbox fork fork milling machine fixture of the present invention;

[0037] Figure 4 It is a schematic diagram of the top view of the structure of the tractor gearbox fork fork milling machine fixture of the present invention;

[0038] Figure 5 It is a schematic diagram of the top view of the structure of the tractor gearbox shift fork fork milling machine fixture of the present invention in a state where the shift fork is clamped;

[0039] Figure 6 It is a schematic diagram of the side cross-sectional structure of the tractor gearbox shift fork fork milling machine fixture of the present invention when the shift fork is clamped;

[0040] Figure 7 It is a schematic diagram of the side cross-sectional structure of the tractor gearbox shift fork fork milling machine fixture of the present invention when the shift fork is clamped;

[0041] Figure 8 It is a side view structural schematic diagram of the tractor gearbox shift fork fork milling machine fixture of the present invention in a state where the shift fork is clamped;

[0042] In the figure: the first screw 1, the spring 2, the flat washer 5, the first pressure plate 4-1, the second pressure plate 4-2, the spherical shoulder nut 6, the ball head bolt 7-1, the ball head fixed end 7-2, the positioning spindle 8, the support frame 9, the fixing seat 10, the recessed area 11, the first adjustment support column 12-1, the second adjustment support column 12-2, the body 13-1, the wing portion 13-2, the second screw 14, the first support plate 15-1, the second support plate 15-2, the first limiting groove 16-1, the second limiting groove 16-2, the base 17, the inner hole portion A, the fork head B, and the fork mouth portion C. DETAILED DESCRIPTION

[0043] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0044] Embodiment 1:

[0045] See also Figures 1 to 8 As shown, this embodiment provides a tractor gearbox fork fork milling machine fixture, including: a positioning core shaft 8 suitable for passing through the inner hole portion A of the fork to limit the inner hole portion A of the fork; a fork head B clamping unit suitable for limiting and clamping a pair of fork heads B of the fork.

[0046] Specifically, the fork B clamping unit includes a left limit clamping assembly and a right limit clamping assembly suitable for respectively limiting and clamping the left fork B and the right fork B of the fork; a recessed area 11 corresponding to the fork mouth C of the fork is formed in the left limit clamping assembly and the right limit clamping assembly.

[0047] The positioning mandrel 8 and the left limit clamping assembly and the right limit clamping assembly are all arranged on a support frame 9; and the support frame 9 is fixed on a base 17. For this embodiment, in order to effectively improve the utilization rate of the support frame 9, the present embodiment symmetrically arranges the shift fork clamping processing operation area on the front and rear side end surfaces of the support frame 9, so that the clamping and limit fixing of the two shift fork workpieces can be realized on the front and rear side end surfaces of the support frame 9 respectively.

[0048] In detail, a positioning spindle 8 is respectively provided on the front and rear end faces of the supporting frame 9; the left limit clamping assembly and the right limit clamping assembly are both located at the top end of the supporting frame 9; wherein the left limit clamping assembly and the right limit clamping assembly are located above the positioning spindle 8; and the positioning spindle 8 is located in the middle area formed by the left limit clamping assembly and the right limit clamping assembly. Such a design is to adapt to the structure of the fork itself.

[0049] In an optional implementation, the left limit clamping assembly and the right limit clamping assembly are symmetrically arranged. Since the left limit clamping assembly and the right limit clamping assembly are respectively used for limiting and clamping a pair of fork heads B of the fork, although the fork formed by the pair of fork heads B and the inner hole portion A is an irregular symmetrical structure, for the limit clamping of the pair of fork heads B, the left limit clamping assembly and the right limit clamping assembly are respectively the head ends of the limit clamping fork heads B. Therefore, the limit operation of the pair of fork heads B can be achieved by the symmetrically structured left limit clamping assembly and the right limit clamping assembly, and will not be affected by the irregularity of the fork. This embodiment takes the case where the left limit clamping assembly and the right limit clamping assembly are symmetrical structures as an example.

[0050] To be more specific, for the symmetrically structured left limit clamping assembly and the right limit clamping assembly, the left limit clamping assembly and the right limit clamping assembly both include a fixing seat 10 fixedly mounted on the top end of the supporting frame 9, a ball stud 7-1 penetrating the fixing seat 10, a first pressure plate 4-1 and a second pressure plate 4-2 sleeved on the ball stud 7-1 and respectively located on both sides of the fixing seat 10, and a first support plate 15-1 and a second support plate 15-2 respectively provided on the side end surfaces of the fixing seat 10 facing the first pressure plate 4-1 and the second pressure plate 4-2; a limit area suitable for the fork head B of the limit fork is formed between the first support plate 15-1 and the first pressure plate 4-1, and between the second support plate 15-2 and the second pressure plate 4-2. It should be noted here that the first pressing plate 4-1 and the second pressing plate 4-2 are respectively arranged on both sides of the fixing seat 10, and the two sides of the fixing seat 10 here are also the two side ends of the support frame 9, that is, the first pressing plate 4-1 and the second pressing plate 4-2 are actually used to fix the fork heads B of the two forks. As for a pair of fork heads B of a fork, the limiting clamping is achieved by the first pressing plate 4-1 or the second pressing plate 4-2 respectively included in the left limiting clamping assembly and the right limiting clamping assembly. Among them, the fixing seat 10 can be optionally fixedly connected to the support frame 9 by, for example, but not limited to, the first screw 1. The first support plate 15-1 and the second support plate 15-2 can be optionally fixed to the fixing seat 10 by, for example, but not limited to, the second screw 14.

[0051] The first support plate 15-1 and the second support plate 15-2 are symmetrically arranged relative to the fixing seat 10; the first support plate 15-1 and the second support plate 15-2 are located on the part of the fixing seat 10 near the recessed area 11; the ball head fixing end 7-2 at one end of the ball head bolt 7-1 extends outward from the second pressing plate away from the fixing seat 10; and a spherical shoulder nut 6 is sleeved on the part of the ball head bolt 7-1 extending outward from the first pressing plate away from the fixing seat 10. That is, the first pressing plate 4-1 and the second pressing plate 4-2 are limited on the ball head bolt 7-1 by the ball head fixing end 7-2 of the ball head bolt 7-1 and the spherical shoulder nut 6.

[0052] In order to facilitate the adjustment of the size of the limiting area for the fork head B of the shift fork formed between the first pressure plate 4-1 and the fixed seat 10, and between the second pressure plate 4-2 and the fixed seat 10, so that when the fork head B of the shift fork needs to be inserted and withdrawn, the distance between the first pressure plate 4-1 and the fixed seat 10, and between the second pressure plate 4-2 and the fixed seat 10 is greater than the size of the fork head B, and when the fork head B needs to be clamped, the distance between the first pressure plate 4-1 and the fixed seat 10, and between the second pressure plate 4-2 and the fixed seat 10 can be adjusted to achieve the clamping effect on the fork head B. In this embodiment, a spring 2 is provided on the outer sleeve of the ball head bolt 7-1; the spring 2 passes through the fixed seat 10, and the two axial ends of the spring 2 respectively abut between the ball head fixed end 7-2 of the ball head bolt 7-1 and the spherical shoulder nut 6. That is, by rotating the spherical shoulder nut 6, the relaxation of the spring 2 sleeved on the ball stud 7-1 can be achieved, and the spacing between the first pressure plate 4-1 and the fixing seat 10, and the spacing between the second pressure plate 4-2 and the fixing seat 10 can be adjusted. The first support plate 15-1 and the second support plate 15-2 are symmetrically arranged relative to the fixing seat 10; and the first support plate 15-1 and the second support plate 15-2 are located on the part of the fixing seat 10 near the recessed area 11. Optionally, a flat washer 5 is arranged between the end of the spring 2 and the spherical shoulder nut 6.

[0053] Since the first support plate 15-1 and the second support plate 15-2 are located on the portion of the fixing seat 10 near the recessed area 11, that is, for the entire fixing seat 10, the first support plate 15-1 and the second support plate 15-2 are arranged toward one side of the middle of the fixing seat 10. Thus, for the other side of the middle of the fixing seat 10 where the first support plate 15-1 or the second support plate 15-2 is arranged, when the first pressing plate 4-1 presses against the first supporting plate 15-1 and the second pressing plate 4-2 presses against the second supporting plate 15-2, due to the fork head B of the shift fork and the first support plate 15-1, and the fork head B of the shift fork and the second support plate 15-2, the middle part of the first pressure plate 4-1 is biased toward the first support plate 15-1, and the middle part of the second pressure plate 4-2 is biased toward the side of the second support plate 15-2 to achieve the support of the side end surface, but the side end surfaces of the middle parts of the first pressure plate 4-1 and the second pressure plate 4-2 are biased away from the first support plate 15-1 and the second support plate 15-2 lack support, which will weaken the clamping effect of the first pressure plate 4-1 and the second pressure plate 4-2 on the fork head B of the shift fork, or fail to achieve the purpose of full clamping. Based on the consideration of the above problems, the present embodiment is provided with a first adjustment support column 12-1 at the part away from the recessed area 11 between the first pressure plate 4-1 and the fixed seat 10; and a second adjustment support column 12-2 is provided at the part away from the recessed area 11 between the second pressure plate 4-2 and the fixed seat 10.

[0054] Here, one end of the first adjustment support column 12-1 is threadedly connected to the fixing seat 10, and the other end of the first adjustment support column 12-1 is suitable for abutting the first pressure plate 4-1; a first limiting groove 16-1 is provided on the end surface of the first pressure plate 4-1 facing the first adjustment support column 12-1. One end of the second adjustment support column 12-2 is threadedly connected to the fixing seat 10, and the other end of the second adjustment support column 12-2 is suitable for abutting the second pressure plate 4-2; a second limiting groove 16-2 is provided on the end surface of the second pressure plate 4-2 facing the second adjustment support column 12-2.

[0055] It should also be noted that between the first adjustment support column 12-1 and the first pressure plate 4-1, and between the second adjustment support column 12-2 and the second pressure plate 4-2, only when the fork B is placed between the first pressure plate 4-1 and the fixing seat 10, and between the second pressure plate 4-2 and the fixing seat 10, and when the spherical shoulder nut 6 is rotated to tighten the fork B of the fork, the first adjustment support column 12-1 gradually approaches the first pressure plate 4-1, and at the same time, the second adjustment support column 12-2 gradually approaches the second pressure plate 4-2. When the fork B of the fork is tightened, the first adjustment support column 12-1 also abuts against the first pressure plate 4-1, and the second adjustment support column 12-2 also abuts against the second pressure plate 4-2. In this way, the support effect is achieved for both sides of the middle of the first pressure plate 4-1 and the second pressure plate 4-2, thereby effectively ensuring the clamping effect of the first pressure plate 4-1 and the second pressure plate 4-2 on the fork B of the fork.

[0056] Embodiment 2:

[0057] On the basis of the tractor gearbox fork fork milling machine fixture of embodiment 1, the tractor gearbox fork fork milling machine fixture provided in this embodiment further includes a positioning member suitable for being loaded in the recessed area 11. The positioning member designed in this embodiment mainly functions to limit the fork mouth portion C in the irregular structure of the fork, so that when the fork head B of the fork is placed in the limiting area of ​​the left limiting clamping assembly and the right limiting clamping assembly, the fork mouth portion C is limited and positioned by the positioning member, so that the limiting fork head B is accurately limited in the limiting area of ​​the left limiting clamping assembly and the right limiting clamping assembly.

[0058] In detail, the positioning member used in this embodiment includes a body 13-1 suitable for being embedded in the recessed area 11, and a wing portion 13-2 integrally connected to the body 13-1 and extending outside the recessed area 11 suitable for clamping the caliper at the fork of the fork; the end surface of the wing portion 13-2 suitable for facing the pair of fork heads B of the fork is an arc surface; and when the fork head B of the fork is placed in the limiting area, the pair of fork heads B of the fork are respectively abutted against the two side ends of the wing portion 13-2. The body 13-1 is mainly used to achieve embedding with the recessed area 11, thereby achieving the fixation of the position of the overall positioning member.

[0059] Embodiment 3:

[0060] Based on the tractor gearbox fork fork milling machine fixture of embodiment 2, the use method of the tractor gearbox fork fork milling machine fixture of this embodiment includes:

[0061] Step S1: The positioning mandrel 8 passes through the inner hole of the shift fork to position the inner hole of the shift fork;

[0062] Step S2: The two fork heads B of the shift fork are respectively inserted into the left limit clamping assembly and the right limit clamping assembly;

[0063] Step S3: embed the positioning member into the recessed area 11, so that the pair of fork heads B of the shift fork contact the two side ends of the wing portion 13-2 of the positioning member;

[0064] Step S4: Clamp a pair of fork heads B of the shift fork by the left limit clamping assembly and the right limit clamping assembly to remove the positioning member from the recessed area 11.

[0065] Specifically, when installing the shift fork workpiece, the inner hole portion A of the shift fork workpiece is first sleeved on the positioning spindle, and then a pair of fork head B end faces are placed in the limiting areas of the left support limiting assembly and the right support limiting assembly and contact the first support plate 15-1 or the second support plate 15-2, and then the positioning piece is placed, and the position of the entire shift fork is adjusted by the wing portion 13-2 of the positioning piece to make the shift fork accurately positioned. After the shift fork workpiece is completely positioned, the positioning piece is removed. In the optional case here, after the shift fork workpiece is positioned, the spherical shoulder nut 6 can be rotated so that the fork head is not easily displaced in a direction parallel to the support frame 9 relative to the support frame 9, but the spherical shoulder nut 6 is not completely tightened here to facilitate the withdrawal of the positioning piece; finally, the spherical shoulder nut 6 is rotated again to completely tighten the shift fork workpiece. Here, the fork head is mainly clamped perpendicular to the direction of the support frame 9, so that the limiting clamping of the entire shift fork workpiece is completed to facilitate the processing operation of the next step.

[0066] It should also be noted that the control of the various functional components involved in the systematic operation of the wolfberry modification processing device designed in this embodiment can be manually controlled to open and close, or they can all be connected to a host computer to coordinate the opening and closing of various functional components through the host computer. This embodiment does not make an absolute limitation on this.

[0067] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0068] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0069] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0070] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They 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 position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0071] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0072] In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

1. A tractor gearbox fork fork milling machine fixture, characterized in that: include: A positioning mandrel, wherein the positioning mandrel is adapted to pass through the inner hole portion of the shift fork to limit the inner hole portion of the shift fork; A fork clamping unit, the fork clamping unit comprising a left limit clamping assembly and a right limit clamping assembly suitable for respectively limiting and clamping the left fork and the right fork of the shift fork; a recessed area corresponding to the fork mouth of the shift fork is formed in the left limit clamping assembly and the right limit clamping assembly; The positioning spindle and the left limit clamping assembly and the right limit clamping assembly are all arranged on a support frame; a positioning spindle is respectively arranged on the front and rear end surfaces of the support frame; the left limit clamping assembly and the right limit clamping assembly are both located at the top end of the support frame; the left limit clamping assembly and the right limit clamping assembly are located above the positioning spindle; and the positioning spindle is located in the middle area formed by the left limit clamping assembly and the right limit clamping assembly; the left limit clamping assembly and the right limit clamping assembly are symmetrically arranged; The left limit clamping assembly and the right limit clamping assembly each include a fixing seat fixedly arranged at the top end of the supporting frame, a ball stud penetrating the fixing seat, a first pressing plate and a second pressing plate sleeved on the ball stud and respectively located at both sides of the fixing seat, and a first supporting plate and a second supporting plate respectively arranged on the side end surfaces of the fixing seat facing the first pressing plate and the second pressing plate; a limiting area suitable for the fork head of the limiting shift fork is formed between the first supporting plate and the first pressing plate, and between the second supporting plate and the second pressing plate; the first supporting plate and the second supporting plate are symmetrically arranged relative to the fixing seat; and the first supporting plate and the second supporting plate are located on the part of the fixing seat near the recessed area; The ball head fixing end of one end of the ball stud extends outward from the second pressure plate away from the fixing seat; and a spherical shoulder nut is sleeved on the portion of the ball stud extending outward from the first pressure plate away from the fixing seat; A first adjustment support column is provided at a portion away from the recessed area between the first pressing plate and the fixing seat; a second adjustment support column is provided at a portion away from the recessed area between the second pressing plate and the fixing seat; The tractor gearbox fork fork milling machine fixture also includes a positioning piece suitable for being loaded in the recessed area; the positioning piece includes a main body suitable for being embedded in the recessed area, and a wing portion integrally connected to the main body and extending out of the recessed area and suitable for clamping the caliper at the fork mouth of the fork; the end surface of the wing portion facing a pair of fork heads of the fork is an arc surface; and when the fork head of the fork is placed in the limiting area, the pair of fork heads of the fork respectively abut against the two side ends of the wing portion.

2. The tractor gearbox fork fork milling machine fixture according to claim 1, characterized in that: A spring is arranged on the outer sleeve of the ball stud; the spring passes through the fixing seat, and the two axial ends of the spring respectively abut between the ball stud fixing end and the spherical shoulder nut of the ball stud.

3. The tractor gearbox fork milling machine fixture according to claim 2, characterized in that: A flat washer is arranged between the end of the spring and the spherical shoulder nut.

4. The tractor gearbox fork milling machine fixture according to claim 1, characterized in that: One end of the first adjustment support column is threadedly connected to the fixing seat, and the other end of the first adjustment support column is suitable for abutting the first pressing plate; a first limiting groove is provided on the end surface of the first pressing plate facing the first adjustment support column; One end of the second adjustment support column is threadedly connected to the fixing seat, and the other end of the second adjustment support column is suitable for abutting the second pressure plate; a second limiting groove is provided on the end surface of the second pressure plate facing the second adjustment support column.

5. A method for using a tractor gearbox fork milling machine fixture, characterized in that: A tractor gearbox shift fork milling machine fixture as claimed in any one of claims 1 to 4; Usage methods include: Step S1: Passing a positioning mandrel through the inner hole of the shift fork to position the inner hole of the shift fork; Step S2: inserting the two fork heads of the shift fork into the left limit clamping assembly and the right limit clamping assembly respectively; Step S3: embedding the positioning member into the recessed area so that a pair of fork heads of the shift fork contact the two side ends of the wing portion of the positioning member; Step S4: Clamp a pair of fork heads of the shift fork by the left limit clamping assembly and the right limit clamping assembly to remove the positioning member from the recessed area.

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