Positioning pin and positioning device

Abstract

The utility model relates to the technical field of railway wagons, in particular to a positioning pin and a positioning device. The embodiment of the utility model provides a positioning pin which is used for being matched with a positioning hole and comprises a positioning sleeve, a transmission assembly and a positioning assembly. The positioning sleeve is provided with a positioning channel, the transmission assembly is movably arranged in the positioning channel, and the positioning assembly is connected with the transmission assembly and partially arranged in the positioning channel. The transmission assembly can move to enable the positioning assembly to move relative to the positioning channel so as to adjust the relative position of the positioning assembly and the central axis of the positioning hole. According to the positioning pin provided by the embodiment of the invention, the relative position of the central axis of the positioning assembly and the central axis of the positioning hole can be adjusted through movement of the transmission assembly, so that the central axis of the positioning assembly and the central axis of the positioning hole coincide, the central axis of the positioning hole is accurately positioned, and the assembly precision of parts is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of railway freight cars, in particular to a positioning pin and a positioning device. Background Art

[0002] When manufacturing railway freight cars, there are a lot of assembly issues involving parts that are positioned based on the central axis of the hole. If the positioning is inaccurate, it will affect the assembly quality and endanger driving safety. In the related art, the positioning pin is inserted into the positioning hole to achieve positioning based on the central axis of the hole. However, in order to facilitate the insertion and removal of the positioning pin, there must be a certain gap between the positioning pin and the positioning hole. This will cause the central axis between the positioning pin and the positioning hole to not coincide, resulting in deviation in the reference positioning and affecting the assembly accuracy of the parts. Utility Model Content

[0003] The present application provides a positioning pin and a positioning device, which solves the technical problem in the related art that the central axes of the positioning pin and the positioning hole do not coincide, resulting in deviation in the reference positioning and affecting the assembly of parts.

[0004] In a first aspect, an embodiment of the present application provides a positioning pin for cooperating with a positioning hole, comprising:

[0005] A positioning sleeve having a positioning channel;

[0006] A transmission assembly, movably disposed in the positioning channel;

[0007] A positioning assembly, connected to the transmission assembly and partially disposed in the positioning channel;

[0008] The transmission assembly can move the positioning assembly relative to the positioning channel to adjust the relative position of the positioning assembly and the central axis of the positioning hole.

[0009] In some embodiments, the positioning assembly includes a plurality of positioning members, and the plurality of positioning members are arranged at intervals along the circumference of the positioning channel, and the positioning members are movably connected to the positioning sleeve and the transmission assembly.

[0010] In some embodiments, when the transmission assembly moves in a first direction, the plurality of positioning members rotate outward relative to the positioning channel; when the transmission assembly moves in a second direction, the plurality of positioning members rotate inward relative to the positioning channel.

[0011] In some embodiments, the positioning assembly further includes a first fixing ring and a second fixing ring, the first fixing ring is arranged on the positioning sleeve, the second fixing ring is arranged on the transmission assembly, the positioning member has a first positioning hole and a second positioning hole, the first fixing ring is passed through the first positioning hole, and the second fixing ring is passed through the second positioning hole.

[0012] In some embodiments, the second positioning hole is an oblong hole.

[0013] In some embodiments, the positioning sleeve is provided with a first fixing groove, the transmission assembly is provided with a second fixing groove, the first fixing ring is provided in the first fixing groove, and the second fixing ring is provided in the second fixing groove.

[0014] In some embodiments, the positioning sleeve is provided with a plurality of first inner grooves, the transmission assembly is provided with a plurality of second inner grooves, the first inner grooves and the second inner grooves are arranged in a one-to-one correspondence to form a plurality of installation grooves, the plurality of installation grooves and the plurality of positioning members are arranged in a one-to-one correspondence, and the positioning members are movably arranged in the corresponding installation grooves.

[0015] In some embodiments, the positioning member is provided with a positioning groove, and the positioning groove can be snap-fitted into the positioning hole when the positioning assembly is opened outwardly relative to the positioning channel.

[0016] In some embodiments, the transmission assembly includes a driving member and a transmission member, the transmission member is disposed in the positioning channel, the positioning assembly is connected to the transmission member, and the driving member is transmission-connected to the transmission member.

[0017] In some embodiments, the driving member and the transmission member are threadedly transmitted.

[0018] In a second aspect, an embodiment of the present application further provides a positioning device, including a sample rod and the above-mentioned positioning pin, wherein part of the transmission assembly is inserted into the sample rod.

[0019] In some embodiments, the transmission assembly includes a driving member and a transmission member, the transmission member is arranged in the positioning channel, the positioning assembly is connected to the transmission member, the driving member is transmission-connected to the transmission member, and a portion of the driving member is inserted into the sample rod.

[0020] In some embodiments, a threaded transmission is provided between the driving member and the transmission member; the positioning pin further includes a first limit member and a second limit member, both of which are fixedly connected to the driving member, the first limit member is arranged in the positioning channel and connected to the sample rod, and the second limit member is connected to a side of the sample rod away from the positioning channel.

[0021] The beneficial effects of this application are as follows:

[0022] The present application provides a positioning pin and positioning device. Since the transmission component can move the positioning component relative to the positioning channel to adjust the relative position of the central axis of the positioning component and the positioning hole, when positioning the positioning hole, after the positioning pin is inserted into the positioning hole, the relative position of the central axis of the positioning component and the positioning hole can be adjusted by moving the transmission component, so that the central axis of the positioning component and the positioning hole coincide, thereby accurately positioning the central axis of the positioning hole and ensuring the assembly accuracy of parts and components. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model.

[0024] Figure 1 This is the assembly design drawing of the upper center plate and upper side bearing.

[0025] Figure 2 Schematic diagram of the assembly of the positioning pin and the positioning hole provided in the embodiment of the present application Figure 1 .

[0026] Figure 3 Schematic diagram of the assembly of the positioning pin and the positioning hole provided in the embodiment of the present application Figure 2 .

[0027] Figure 4 for Figure 2 and Figure 3 Schematic diagram of the structure of the positioning pin.

[0028] Figure 5 for Figure 4 Cross-section view of the center positioning pin Figure 1 .

[0029] Figure 6 for Figure 4 Cross-section view of the center positioning pin Figure 2 .

[0030] Figure 7 for Figure 4 and Figure 5 Schematic diagram of the structure of the positioning parts.

[0031] Figure 8 for Figure 4 and Figure 5 Schematic diagram of the structure of the positioning sleeve.

[0032] Fig. 9 for Figure 8 Top view of the .

[0033] Fig.10 for Figure 4 and Figure 5 Schematic diagram of the partial structure of the transmission component.

[0034] Fig.11 for Fig.10 Top view of the .

[0035] Fig.12 A schematic diagram of the structure of a positioning device provided in an embodiment of the present application.

[0036] Fig.13 A structural diagram of another perspective of the positioning device provided in an embodiment of the present application

[0037] Description of reference numerals:

[0038] 1-upper center plate, 11-center plate hole, 2-upper side bearing seat, 10-positioning device, 100-positioning pin, 110-positioning sleeve, 111-positioning channel, 112-first fixed groove, 113-first inner groove, 120-transmission assembly, 121-driving member, 122-transmission member, 123-second fixed groove, 124-second inner groove, 125-first limiting part, 126-second limiting part, 130-positioning assembly, 131-positioning member, 1311-first positioning hole, 1312-second positioning hole, 1313-positioning groove, 132-first fixing ring, 133-second fixing ring, 200-sample rod. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In addition, in the present utility model, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0043] The manufacture of railway freight cars involves a large number of assembly issues involving parts that are positioned based on the central axis of the hole. If the positioning is inaccurate, it will affect the assembly quality and endanger driving safety. For example, during the production of the BH1 type heat-insulating car, the assembly of the upper side bearing needs to be positioned based on the central axis of the center plate hole. Figure 1 Design drawings for the upper side bearing assembly, combined with Figure 1 It can be seen that the design length between the center axis of the center plate hole and the center axis of the upper side bearing is 760±2mm, and the design height between the plane formed by the upper side bearing and the upper center plate plane is 76±2mm. In order to make the assembly of the upper side bearing and the upper center plate meet the design requirements and ensure the assembly accuracy, it is necessary to use the locating pins to position them with the center plate hole as the reference.

[0044] In the related art, in order to facilitate the insertion and removal of the locating pin, there must be a certain gap between the locating pin and the center plate hole. The measured diameter of the center plate hole is 54mm, and the diameter of the locating pin is 50mm. In this way, the reference positioning deviation reaches 4mm, and it is impossible to ensure that the distance from the center axis of the upper side bearing to the center axis of the center plate hole is 760±2mm, and the radial constraint fails.

[0045] In order to solve the above technical problems to a certain extent, the embodiments of the present application provide a positioning pin and a positioning device, which can make the central axis of the positioning component and the positioning hole coincide with each other, so that the central axis of the positioning hole is accurately positioned, ensuring the assembly accuracy of parts and components.

[0046] The following is a description of the embodiments of the present application in conjunction with the accompanying drawings:

[0047] Combination Figure 2 and Figure 3 The embodiment of the present application provides a positioning pin 100 for cooperating with a positioning hole, comprising a positioning sleeve 110, a transmission assembly 120 and a positioning assembly 130. The positioning sleeve 110 has a positioning channel 111, the transmission assembly 120 is movably disposed in the positioning channel 111, and the positioning assembly 130 is connected to the transmission assembly 120 and is partially disposed in the positioning channel 111. The transmission assembly 120 can move to move the positioning assembly 130 relative to the positioning channel 111 to adjust the relative position of the positioning assembly 130 and the central axis of the positioning hole.

[0048] A positioning pin 100 provided in an embodiment of the present application has a transmission component 120 that can move the positioning component 130 relative to the positioning channel 111 to adjust the relative position of the positioning component 130 and the central axis of the positioning hole. Therefore, after the positioning pin 100 is inserted into the positioning hole, the relative position of the positioning component 130 and the central axis of the positioning hole can be adjusted by moving the transmission component 120 so that the central axis of the positioning component 130 and the positioning hole coincide with each other, thereby accurately positioning the central axis of the positioning hole and ensuring the assembly accuracy of parts and components.

[0049] It should be noted that the positioning hole can be the center plate hole 11 or other holes used as a reference, and there is no limitation on this. After the positioning pin 100 is inserted into the positioning hole, the positioning sleeve 110 is connected to the inner wall of the positioning hole, the positioning channel 111 is located in the middle of the positioning sleeve 110, the positioning channel 111 is coaxial with the positioning sleeve 110, and because part of the positioning component 130 is arranged in the positioning channel 111, the positioning component 130 is coaxial with the positioning channel 111. Therefore, after the central axis of the positioning component 130 and the positioning hole coincide, the central axis of the positioning sleeve 110 and the positioning hole also coincide, so that other parts can be assembled with the central axis of the positioning sleeve 110 as a reference, ensuring the assembly accuracy of the parts.

[0050] In some embodiments, in combination Figure 4-Figure 6 The positioning assembly 130 includes a plurality of positioning members 131 , which are arranged at intervals along the circumference of the positioning channel 111 , and the positioning members 131 are movably connected to the positioning sleeve 110 and the transmission assembly 120 .

[0051] Since the positioning member 131 is movably connected with the positioning sleeve 110 and the transmission assembly 120, the positioning member 131 can move relative to the positioning channel 111. Obviously, the plurality of positioning members 131 move synchronously relative to the positioning channel 111 under the drive of the transmission assembly 120. Since the plurality of positioning members 131 are arranged at intervals along the circumference of the positioning channel 111, in other words, when the positioning pin 100 is inserted into the positioning hole, the plurality of positioning members 131 are arranged at intervals along the circumference of the positioning hole, so the plurality of positioning members 131 move synchronously, which can be automatically centered, so that the positioning assembly 130 coincides with the central axis of the positioning hole.

[0052] Specifically, the positioning member 131 may be a sheet-like structure, and four positioning members 131 may be provided, and the four positioning members 131 are arranged at equal intervals. Of course, more than four positioning members 131 may also be provided, and this is not limited.

[0053] In some embodiments, when the transmission assembly 120 moves in the first direction, the plurality of positioning members 131 rotate outward relative to the positioning channel 111 ; when the transmission assembly 120 moves in the second direction, the plurality of positioning members 131 rotate inward relative to the positioning channel 111 .

[0054] The positioning member 131 can rotate around the positioning sleeve 110 or the transmission assembly 120, and the first direction and the second direction are opposite. Therefore, when the transmission assembly 120 moves in the first direction and the second direction, the rotation direction of the positioning member 131 is also opposite. It should be explained that "rotating outward" means rotating in a direction away from the central axis of the positioning hole, and "rotating inward" means rotating in a direction close to the central axis of the positioning hole. Taking the figure as an example, "rotating outward" means rotating clockwise, and "rotating inward" means rotating counterclockwise. When the positioning member 131 rotates outward, the positioning assembly 130 opens outward, and the diameter of the positioning assembly 130 increases. When the positioning member 131 rotates inward, the positioning assembly 130 contracts inward, and the diameter of the positioning assembly 130 decreases.

[0055] like Figure 2 As shown, in order to facilitate the insertion of the positioning pin 100 into the positioning hole, before the insertion, the positioning member 131 is first rotated inwardly by the transmission assembly 120 so that the diameter of the positioning assembly 130 is smaller than the diameter of the positioning hole, so that the positioning pin 100 can be inserted into the positioning hole; Figure 3 As shown, after the locating pin 100 is inserted into the locating hole, the locating member 131 is opened outward through the transmission assembly 120, and multiple locating members 131 are opened outward synchronously. When each locating member 131 contacts the inner wall of the locating hole, the locating assembly 130 coincides with the central axis of the locating hole.

[0056] In some embodiments, in combination Figure 5-Figure 7The positioning assembly 130 also includes a first fixing ring 132 and a second fixing ring 133. The first fixing ring 132 is arranged on the positioning sleeve 110, and the second fixing ring 133 is arranged on the transmission assembly 120. The positioning member 131 has a first positioning hole 1311 and a second positioning hole 1312. The first fixing ring 132 is passed through the first positioning hole 1311, and the second fixing ring 133 is passed through the second positioning hole 1312.

[0057] The first fixing ring 132 is sleeved on the outer wall of the positioning sleeve 110, and the second fixing ring 133 is sleeved on the outer wall of the transmission component 120. Since the first fixing ring 132 is inserted into the first positioning hole 1311, and the second fixing ring 133 is inserted into the second positioning hole 1312, the positioning member 131 is simultaneously inserted into the first fixing ring 132 and the second fixing ring 133. Since the first fixing ring 132 is arranged on the positioning sleeve 110, and the second fixing ring 133 is arranged on the transmission component 120, the positioning member 131 is movably connected with the transmission component 120 and the positioning sleeve 110 through the first fixing ring 132 and the second fixing ring 133.

[0058] It should be noted that in order to facilitate the assembly of the first fixing ring 132 to the positioning sleeve 110 and the assembly of the second fixing ring 133 to the transmission assembly 120, the first fixing ring 132 and the second fixing ring 133 can be a split structure, that is, the first fixing ring 132 and the second fixing ring 133 can both be two half rings.

[0059] In some embodiments, the second positioning hole 1312 is an oblong hole.

[0060] That is, the first fixing ring 132 cooperates with the first positioning hole 1311, so that the positioning plate can rotate outward / inward around the first fixing ring 132. In order to avoid the second fixing ring 133 from restricting the rotation of the positioning plate, the second positioning hole 1312 is set as an oblong hole. During the rotation of the positioning plate around the first fixing ring 132, the second fixing ring 133 can move relatively in the second positioning hole 1312.

[0061] In some embodiments, in order to make the installation of the first fixing ring 132 and the second fixing ring 133 more stable, the positioning sleeve 110 is provided with a first fixing groove 112, the transmission assembly 120 is provided with a second fixing groove 123, the first fixing ring 132 is provided in the first fixing groove 112, and the second fixing ring 133 is provided in the second fixing groove 123. Of course, the first fixing groove 112 is provided on the outer wall of the positioning sleeve 110, and the second fixing groove 123 is provided on the outer wall of the transmission assembly 120.

[0062] In some embodiments, in combination Figure 8-Figure 11The positioning sleeve 110 is provided with a plurality of first inner grooves 113, and the transmission assembly 120 is provided with a plurality of second inner grooves 124. The first inner grooves 113 and the second inner grooves 124 are arranged one-to-one to form a plurality of installation grooves. The plurality of installation grooves are arranged one-to-one to the plurality of positioning members 131, and the positioning members 131 are movably arranged in the corresponding installation grooves.

[0063] The first inner groove 113 is arranged at the top of the positioning sleeve 110, and the second inner groove 124 is arranged at the top of the transmission assembly 120. The first inner groove 113 and the second inner groove 124 are arranged correspondingly and connected to each other, that is, forming an installation groove. The installation groove is a structure for accommodating the positioning member 131. When the positioning member 131 rotates inward, it shrinks in the installation groove. When the positioning member 131 rotates outward, it opens outward from the installation groove.

[0064] Of course, since the positioning sleeve 110 is also provided with a first fixing groove 112, the transmission assembly 120 is also provided with a second fixing groove 123, and the positioning piece is simultaneously passed through the first fixing ring 132 and the second fixing ring 133, the first fixing groove 112, the first inner groove 113, the second fixing groove 123 and the second inner groove 124 are all connected.

[0065] In some embodiments, in combination Figure 3 and Figure 7 The positioning member 131 is provided with a positioning groove 1313 , and the positioning groove 1313 can be snapped into the positioning hole when the positioning assembly 130 is opened outward relative to the positioning channel 111 .

[0066] The positioning groove 1313 is arranged at the edge of the positioning piece. After the multiple positioning members 131 are opened outward synchronously, they can be snapped into the positioning hole, thereby achieving automatic centering while also generating axial constraints between the positioning pin 100 and the positioning hole, improving the axial movement of the positioning pin 100 and further improving the positioning accuracy.

[0067] Specifically, the part of the positioning hole that the positioning groove 1313 clamps is the angle formed by the side wall and the upper surface of the positioning hole. After the positioning groove 1313 is clamped in the positioning hole, the axial movement of the positioning pin 100 can be prevented under the stopping action between the positioning groove 1313 and the upper surface of the positioning hole.

[0068] In some embodiments, in combination Figure 5 and Figure 6 The transmission assembly 120 includes a driving member 121 and a transmission member 122 . The transmission member 122 is disposed in the positioning channel 111 . The positioning assembly 130 is connected to the transmission member 122 . The driving member 121 is in transmission connection with the transmission member 122 .

[0069] That is, the second fixing groove 123 and the second inner groove 124 are both disposed on the transmission member 122, and the driving member 121 can drive the transmission member 122 to move in the first direction or the second direction in the positioning channel 111, so as to drive the positioning member 131 to rotate outward or inward. Of course, the first direction or the second direction is parallel to the central axis of the positioning channel 111.

[0070] Specifically, the driving member 121 and the transmission member 122 can be threadedly transmitted, that is, the driving member 121 has an internal thread, the transmission member 122 has an external thread, and the driving member 121 and the transmission member 122 are threadedly connected, so that by rotating the driving member 121, the transmission member 122 can move in the first direction or the second direction.

[0071] Based on the same utility model concept, combined with Fig.12 and Fig.13 The embodiment of the present application also provides a positioning device 10, including a sample rod 200 and a positioning pin 100 as described above, a portion of the transmission assembly 120 is inserted into the sample rod 200, and the sample rod 200 is used to assemble other parts. For example, in the assembly of the upper side support seat 2 and the upper center plate 1, after the positioning pin 100 is inserted into the center plate hole 11, the two sides of the sample rod 200 can be used to position the upper side support seat 2, and the length between the two sides of the sample rod 200 and the central axis of the positioning pin 100, and the height between the two sides of the sample rod 200 and the positioning pin 100 are all design values, so that the assembly accuracy of the upper side support seat 2 and the upper center plate 1 after the sample rod 200 and the positioning pin 100 are assembled can meet the requirements. The beneficial effects of the positioning device 10 provided in the embodiment of the present application are the same as the beneficial effects of the positioning pin 100 described above, which will not be repeated here.

[0072] In some embodiments, the transmission assembly 120 includes a driving member 121 and a transmission member 122, the transmission member 122 is disposed in the positioning channel 111, the positioning assembly 130 is connected to the transmission member 122, the driving member 121 is transmission-connected to the transmission member 122, and a portion of the driving member 121 is passed through the sample rod 200.

[0073] Since part of the driving member 121 is inserted into the sample rod 200 , a handle may be connected to the driving member 121 to facilitate the rotation of the driving member 121 , and the driving member 121 may be rotated by rotating the handle.

[0074] In some embodiments, in combination Figure 5 and Figure 6 , threaded transmission is performed between the driving member 121 and the transmission member 122; the positioning pin 100 also includes a first limit member and a second limit member, both of which are fixedly connected to the driving member 121, the first limit member is arranged in the positioning channel 111 and connected to the sample rod 200, and the second limit member is connected to a side of the sample rod 200 away from the positioning channel 111.

[0075] The driving member 121 can be a screw, and the transmission member 122 can be a nut. Since the position of the screw is fixed, the nut will move up and down along the central axis when the screw is rotated. Therefore, the first limit member is arranged in the positioning channel 111 and connected to the sample rod 200, and the second limit member is connected to the side of the sample rod 200 away from the positioning channel 111, that is, the first limit member and the second limit member jointly limit the axial movement of the driving member 121, so that when the screw is rotated, the screw will not move axially.

[0076] Specifically, the screw rod includes a rod body and a head, a portion of the rod body is disposed in the sample rod 200, and the head is configured as a second limiting member. The first limiting member may be a block structure and is welded to the rod body.

[0077] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0078] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A positioning pin, used to cooperate with a positioning hole, characterized in that: include: A positioning sleeve having a positioning channel; A transmission assembly, movably disposed in the positioning channel; A positioning assembly, connected to the transmission assembly and partially disposed in the positioning channel; The transmission assembly can move the positioning assembly relative to the positioning channel to adjust the relative position of the positioning assembly and the central axis of the positioning hole.

2. The positioning pin according to claim 1, characterized in that: The positioning assembly includes a plurality of positioning members, which are arranged at intervals along the circumference of the positioning channel, and the positioning members are movably connected to the positioning sleeve and the transmission assembly.

3. The positioning pin according to claim 2, characterized in that: When the transmission assembly moves in a first direction, the plurality of positioning members rotate outward relative to the positioning channel; when the transmission assembly moves in a second direction, the plurality of positioning members rotate inward relative to the positioning channel.

4. The positioning pin according to claim 2, characterized in that: The positioning assembly also includes a first fixing ring and a second fixing ring, the first fixing ring is arranged on the positioning sleeve, the second fixing ring is arranged on the transmission assembly, the positioning member has a first positioning hole and a second positioning hole, the first fixing ring is passed through the first positioning hole, and the second fixing ring is passed through the second positioning hole.

5. The positioning pin according to claim 4, characterized in that: The second positioning hole is an oblong hole.

6. The positioning pin according to claim 4, characterized in that: The positioning sleeve is provided with a first fixing groove, the transmission assembly is provided with a second fixing groove, the first fixing ring is provided in the first fixing groove, and the second fixing ring is provided in the second fixing groove.

7. The positioning pin according to claim 2, characterized in that: The positioning sleeve is provided with a plurality of first inner grooves, the transmission assembly is provided with a plurality of second inner grooves, the first inner grooves and the second inner grooves are arranged in a one-to-one correspondence to form a plurality of installation grooves, the plurality of installation grooves and the plurality of positioning members are arranged in a one-to-one correspondence, and the positioning members are movably arranged in the corresponding installation grooves.

8. The positioning pin according to claim 2, characterized in that: The positioning member is provided with a positioning groove, and the positioning groove can be snap-fitted to the positioning hole under the condition that the positioning assembly is opened outward relative to the positioning channel.

9. The positioning pin according to any one of claims 1 to 8, characterized in that: The transmission assembly comprises a driving member and a transmission member, wherein the transmission member is arranged in the positioning channel, the positioning assembly is connected to the transmission member, and the driving member is in transmission connection with the transmission member.

10. The positioning pin according to claim 9, characterized in that: The driving member and the transmission member are threadedly transmitted.

11. A positioning device, characterized in that: It comprises a sample rod and a positioning pin as described in any one of claims 1 to 9, wherein part of the transmission assembly is inserted into the sample rod.

12. The positioning device according to claim 11, characterized in that: The transmission assembly includes a driving member and a transmission member, the transmission member is arranged in the positioning channel, the positioning assembly is connected to the transmission member, the driving member is in transmission connection with the transmission member, and part of the driving member is inserted into the sample rod.

13. The positioning device according to claim 11, characterized in that: There is threaded transmission between the driving member and the transmission member; the positioning pin also includes a first limit member and a second limit member, the first limit member and the second limit member are both fixedly connected to the driving member, the first limit member is arranged in the positioning channel and connected to the sample rod, and the second limit member is connected to a side of the sample rod away from the positioning channel.

Images