Limiting pin shaft and pin shaft limiting assembly of mine dump truck

Abstract

The utility model discloses a kind of limit pin shafts, include: pin shaft body, limit ring, stud bolt and positioning pin, pin shaft body is cylindrical, one side is provided with the flange extending along circumferential direction, flange is provided with pin groove, the other side is provided with external thread;Limit ring is threadedly connected on pin shaft body, limit ring is annular structure, its inner hole is provided with internal thread, limit ring is provided with opening, opening is communicated with inner hole and outer peripheral surface;The inner hole of limit ring is provided with axial slot along axial direction, axial slot is through inner hole, limit ring is provided with axial through-hole, the side portion of axial slot, axial through-hole is communicated;The outer wall of limit ring on the both sides of opening is respectively provided with connecting hole, one connecting hole is threaded hole, stud bolt is installed in connecting hole, positioning pin is installed in pin groove.The utility model also a kind of pin shaft limiting assembly.The utility model can improve the safety and reliability of pin shaft.

Description

Technical Field

[0001] This utility model belongs to the field of mining dump trucks, and specifically relates to a limiting pin and pin limiting assembly for a mining dump truck. Background Technology

[0002] Mining dump trucks are large pieces of equipment used in open-pit mines to transport materials and minerals. Their components are mostly connected using sliding bearings and pins. The pins provide effective support for the sliding bearings. Correspondingly, the pins are the force transmission components between two components with mutual motion relationships, so it is very important to reliably restrict their position.

[0003] If the pin limit fails, the pin may come out axially, causing the connection between the two components to fail, which will affect the safety and reliability of the entire vehicle. Utility Model Content

[0004] The purpose of this utility model is to provide a limiting pin and pin limiting assembly for a mining dump truck, which improves the safety and reliability of the pin.

[0005] To achieve the above objectives, the technical solution used in this utility model is as follows:

[0006] The limiting pin includes: a pin body, a limiting ring, a stud bolt, and a positioning pin. The pin body is cylindrical, with a flange extending circumferentially on one side and a pin groove on the flange, and an external thread on the other side. The limiting ring is threaded onto the pin body. The limiting ring is annular, with an internal thread in its inner hole and an opening that connects the inner hole and the outer circumferential surface. The inner hole of the limiting ring has an axial groove along the axial direction, which penetrates the inner hole. The limiting ring also has an axial through hole, and the sides of the axial groove and the axial through hole are connected. The outer walls of the limiting ring on both sides of the opening have connecting holes, one of which is a threaded hole. The stud bolt is installed in the connecting hole, and the positioning pin is installed in the pin groove.

[0007] Furthermore, the connecting hole is perpendicular to the opening, and the connecting holes on both sides of the opening are, respectively, a through hole and a threaded hole.

[0008] Furthermore, the upper end face of the through hole is a plane, and the plane is perpendicular to the axis of the connecting hole.

[0009] Furthermore, the opening and the axial groove are positioned relative to each other.

[0010] The pin-shaft limiting assembly includes: a connecting rod, a support, a spherical bearing, a retaining ring, a first spacer, a second spacer, and a limiting pin. One end of the connecting rod has a seat hole, and the inner wall of the right side of the seat hole has a shoulder. The center hole of the shoulder is smaller than the inner diameter of the seat hole. The inner wall of the left side of the seat hole has an installation groove. The spherical bearing is installed in the seat hole, with its right side contacting the shoulder. The retaining ring is installed in the installation groove, with its right side contacting the spherical bearing. The support has lugs on both sides, each lug having a mounting hole. The pin is located between the two lugs. The pin body passes through the mounting hole and the inner hole of the spherical bearing. The first and second spacers are fitted onto the pin body, located on opposite sides of the spherical bearing. A locating pin is installed in the pin groove and the blind holes of the lugs. The limiting ring is located outside the mounting hole.

[0011] Preferably, the flange is located outside the mounting hole and contacts the side of the lug, and the limiting ring contacts the side of the lug.

[0012] Preferably, the first spacer is disposed between the spherical bearing and the left lug of the support, and the second spacer is disposed between the spherical bearing and the right lug of the support.

[0013] Preferably, the pin body, mounting hole, inner hole of the first spacer, inner hole of the spherical bearing, and inner hole of the second spacer are located on the central axis.

[0014] The technical effects of this utility model include:

[0015] According to the above scheme, the pin limiting assembly uses a threaded connection between the pin and the limiting ring, which improves the connection strength. The limiting ring is further tightened with bolts to prevent loosening, thus improving the safety and reliability of the pin. A locating pin is placed between the pin flange and the support to restrict the pin from rotating circumferentially.

[0016] The clamping force generated by tightening the bolt head on the limiting ring will pull the limiting ring circumferentially, making the limiting ring self-locking.

[0017] Correspondingly, this improves the safety and reliability of the pins, bases, and spherical bearings. Attached Figure Description

[0018] Figure 1 This is a sectional view of the pin shaft limiting device after installation in this utility model;

[0019] Figure 2 yes Figure 1 A partial view along the S-axis.

[0020] Figure 3 This is an isometric view of the pin in this utility model;

[0021] Figure 4 This is an isometric view of the limiting ring in this utility model;

[0022] Figure 5 This is a front view of the limiting ring in this utility model.

[0023] 1-Connecting rod, 1a-Seal hole, 1b-Groove;

[0024] 2-Support, 2a-Through hole, 2b-Blind hole;

[0025] 3-Spherical plain bearing;

[0026] 4-Clasp;

[0027] 5-First spacer ring;

[0028] 6-Second spacer ring;

[0029] 7-Limiting pin, 71-Pin body, 71a-Flange, 71b-External thread, 71c-Pin groove, 72-Limiting ring, 72a-Internal thread, 72b-Radial opening, 72c-Axial through hole, 72d-Connecting hole, 72e-Axial groove, 72da-Through hole, 72db-Threaded hole, 72dc-Flat surface; 73-Internal hexagonal head bolt (fastening component), 74-Locking pin; O-Central axis; P-Connecting hole axis. Detailed Implementation

[0030] The following description fully illustrates specific embodiments of the present invention to enable those skilled in the art to practice and reproduce it. In the following description, the direction along the central axis O is referred to as the "axial direction", the tangent direction at any point rotating about the central axis O is referred to as the "circumferential direction" or "circumferential direction", and the direction intersecting the central axis O and perpendicular to the central axis O is referred to as the "radial direction".

[0031] The following is with reference to the appendix. Figure 1-3 The specific implementation scheme of the pin limit device for mining dump trucks involved in this utility model is described.

[0032] like Figure 1 The image shown is a sectional view of the pin shaft limiting assembly after installation in this utility model; as shown... Figure 2 As shown, is Figure 1 A partial view along the S-axis.

[0033] The pin limiting assembly includes: connecting rod 1, support 2, spherical bearing 3, retaining ring 4, first spacer 5, second spacer 6, and limiting pin 7.

[0034] One end of the connecting rod 1 is provided with a seat hole 1a, and a shoulder is provided on the inner wall of the right side of the seat hole 1a. The center hole of the shoulder is smaller than the inner diameter of the seat hole 1a. An installation groove 1b is provided on the inner wall of the left side of the seat hole 1a.

[0035] The spherical plain bearing 3 is installed in the seat hole 1a on the connecting rod 1, with its right side contacting the shoulder on the right side of the seat hole 1a. The retaining ring 4 is installed in the mounting groove 1b on the left side of the seat hole 1a on the connecting rod 1, with its right side contacting the spherical plain bearing 3. The retaining ring 4 and the shoulder limit the axial position of the spherical plain bearing 3, thereby achieving the fixation of the spherical plain bearing in the seat hole 1a.

[0036] The connecting rod 1 is equipped with a spherical bearing 3, one end of which is installed in the middle of the lugs on the left and right sides of the support 2. The lugs are provided with mounting holes 2a.

[0037] The first spacer 5 and the second spacer 6 are located between the two lugs and are fitted onto the limiting pin 7. The first spacer 5 is located between the spherical bearing 3 and the left lug of the support 2, and the second spacer 6 is located between the spherical bearing 3 and the right lug of the support 2.

[0038] The first spacer 5 and the second spacer 6 limit the axial movement of the spherical bearing 3 in the support 2, and further limit the axial movement of the connecting rod 1 in the support 2.

[0039] like Figure 3 The image shown is an isometric view of the pin shaft body 71 in this utility model; as shown... Figure 4 The image shown is an isometric view of the limiting ring 72 in this utility model; as shown... Figure 5 The image shown is a front view of the limiting ring 72 in this utility model.

[0040] The limiting pin 7 includes: pin body 71, limiting ring 72, head bolt (internal hexagonal head bolt) 73, and positioning pin 74.

[0041] The pin body 71 is a cylindrical shape extending axially, with a flange 71a extending circumferentially on one side and a pin groove 71c on the flange 71a; and an external thread 71b on the other side.

[0042] The pin body 71 is installed in the mounting hole 2a, the inner hole of the first spacer 5, the inner hole of the spherical bearing 3, and the inner hole of the second spacer 6. The flange 71a contacts the side of the support 2 and is located outside the mounting hole 2a.

[0043] The pin body 71 passes through the mounting hole 2a, the inner hole of the first spacer 5, the inner hole of the spherical bearing 3, and the inner hole of the second spacer 6 in sequence and extends axially. The pin body 71, the mounting hole 2a, the inner hole of the first spacer 5, the inner hole of the spherical bearing 3, and the inner hole of the second spacer 6 are located on the central axis O.

[0044] The limiting ring 72 is threaded onto the pin body 71, and is located outside the mounting hole 2a. The limiting ring 72 is an annular structure extending circumferentially, with an internal thread 72a in its inner hole and a radially extending opening 72b connecting the inner hole and the outer circumferential surface. The internal thread 72a and the external thread 71b have the same specifications.

[0045] The inner hole of the limiting ring 72 has an axial groove 72e along the axial direction, which extends through the inner hole. The limiting ring 72 also has an axial through hole 72c, and the sides of the axial groove 72e and the axial through hole 72c are connected. The cross-sections of the axial groove 72e and the axial through hole 72c are circular on the left and rectangular on the right, with the right side communicating with the inner hole. The limiting ring 72 is axially threaded onto the pin body 71 from the right side until the limiting ring 72 contacts the side of the support 2, thereby axially fixing the pin body 71.

[0046] The outer walls of the limiting rings 72 on both sides of the opening 72b are provided with connecting holes 72d, which are perpendicular to the opening 72b. One of the connecting holes 72d on each side of the opening 72b is a through hole 72da, and the other is a threaded hole 72db. The upper end face of the through hole 72da is a plane 72dc, which is perpendicular to the axis P of the connecting hole 72d. The opening 72b and the axial groove 72e are positioned opposite each other, with a 180° interval between them.

[0047] The head bolt 73 is installed in the connecting hole 72d and is threaded. The head bolt 73 passes through the upper through hole 72da of the connecting hole 72d of the limiting ring 72 and is threaded into the lower threaded hole 72db. The bolt head of the head bolt 73 contacts the plane 72dc.

[0048] The clamping force generated by the head bolt 73 pulls the limiting ring 72 circumferentially, thereby eliminating the gap between the limiting ring 72 and the screw body 71, and increasing the positive pressure on the threaded contact surface, thus achieving the purpose of preventing the limiting ring 72 from loosening. At the same time, it ensures the reliable axial fixation of the screw body 71.

[0049] When the head bolt 73 tightens the limiting ring 72 circumferentially, the axial groove 72e prevents stress concentration in the limiting ring 72 during circumferential stretching, thereby improving the stress state of the limiting ring 72 and increasing its reliability.

[0050] The locating pin 74 is installed in the pin groove 71c and the blind hole 2b on the support 2. The locating pin 74 is installed between the flange 71a and the support 2, with its left end installed in the pin groove 71c of the flange 71a and its right end installed in the blind hole 2b of the lug. The locating pin 74 does not coincide with the central axis O, and accordingly, the locating pin 74 restricts the rotation of the pin body 71 around the central axis O.

[0051] The limiting method for the pin limit assembly, and the specific steps are as follows:

[0052] Step 1: The pin body 71 and the limiting ring 72 are connected by threads. An opening 72b is provided in the limiting ring 72. The head bolt 73 is threaded to the connecting holes 72d on both sides of the opening 72b, so that the limiting ring 72 and the pin body 71 are locked relative to each other.

[0053] The pin body 71 and the limiting ring 72 are connected by a thread, with the major diameter of the thread equal to the pin diameter, resulting in high connection strength. Furthermore, rotating the limiting ring 72 adjusts the clamping degree between the pin body 71 and the support 2, consequently reducing the machining accuracy of the pin body 71 in the axial dimension and lowering machining costs. Moreover, the limiting ring 72 has an opening 72b and is further tightened using a head bolt 73, achieving relative locking between the limiting ring 72 and the pin body 71, thus restricting the axial movement of the pin body 71.

[0054] Step 2: A pin groove 71c is provided on the flange 71a at the end of the pin body 71. A positioning pin 74 is installed in the pin groove 71c and the blind hole 2b of the support lug. The circumferential rotation of the pin body 71 is restricted by the positioning pin 74.

[0055] A locating pin 74 is provided between the pin body 71 and the support 2. The eccentrically arranged locating pin 74 effectively restricts the rotation of the pin body 71. Accordingly, the degrees of freedom of the pin body 71 are restricted, and the pin body 71 is reliably fixed.

[0056] The terminology used in this invention is descriptive and exemplary, and not restrictive. Since this invention can be embodied in various forms without departing from the spirit or essence of the technical solution, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A limiting pin, characterized in that, include: The pin body comprises a retaining ring, a head bolt, and a locating pin. The pin body is cylindrical with a flange extending circumferentially on one side, on which a pin groove is provided. The other side has an external thread. The retaining ring is threaded onto the pin body and is an annular structure with an internal thread in its inner hole. The retaining ring has an opening that connects the inner hole and the outer circumferential surface. The inner hole of the retaining ring has an axial groove extending through the inner hole. The retaining ring also has an axial through hole, and the sides of the axial groove and the axial through hole are connected. The outer walls of the retaining ring on both sides of the opening have connecting holes, one of which is a threaded hole. The head bolt is installed in the connecting hole, and the locating pin is installed in the pin groove.

2. The limiting pin as described in claim 1, characterized in that, The connecting hole is perpendicular to the opening. One of the connecting holes on the two sides of the opening is a through hole, and the other is a threaded hole.

3. The limiting pin as described in claim 2, characterized in that, The upper end face of the through hole is a plane, and the plane is perpendicular to the axis of the connecting hole.

4. The limiting pin as described in claim 1, characterized in that, The opening and the axial groove are positioned opposite each other.

5. A pin-shaft limiting assembly, characterized in that, include: The system comprises a connecting rod, a support, a spherical bearing, a retaining ring, a first spacer, a second spacer, and a limiting pin as described in any one of claims 1-4. One end of the connecting rod has a seat hole, and the inner wall of the right side of the seat hole has a shoulder. The center hole of the shoulder is smaller than the inner diameter of the seat hole. The inner wall of the left side of the seat hole has an installation groove. The spherical bearing is installed in the seat hole, with its right side contacting the shoulder. The retaining ring is installed in the installation groove, with its right side contacting the spherical bearing. The support has lugs on both sides, each lug having a mounting hole. The spherical pin is located between the two lugs. The pin body passes through the mounting hole and the inner hole of the spherical bearing. The first and second spacers are fitted onto the pin body, located on opposite sides of the spherical bearing. A locating pin is installed in the pin groove and the blind hole of the lug. The limiting ring is located outside the mounting hole.

6. The pin-shaft limiting assembly as described in claim 5, characterized in that, The flange is located outside the mounting hole and contacts the side of the lug, and the limiting ring contacts the side of the lug.

7. The pin-shaft limiting assembly as described in claim 5, characterized in that, The first spacer is located between the spherical bearing and the left lug of the support, and the second spacer is located between the spherical bearing and the right lug of the support.

8. The pin-shaft limiting assembly as described in claim 5, characterized in that, The pin body, mounting hole, inner hole of the first spacer, inner hole of the spherical bearing, and inner hole of the second spacer are located on the central axis.

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