Pressing arm structure

Abstract

The utility model discloses a pressing arm structure, and relates to the technical field of sun gear positioning, the pressing arm structure is used for positioning a sun gear placed on a positioning platform, and the pressing arm structure comprises a pressing cylinder part, a hinge part, a pressing arm part, a fulcrum seat and a positioning bearing part, one end of the pressing air cylinder component is connected to the first direction of the positioning platform; the hinging part is connected to the pressing cylinder part; one end of the pressing arm component is hinged to the hinge component; one end of the fulcrum seat is hinged with the middle part of the pressing arm part, and the other end of the fulcrum seat is connected with the second direction of the positioning platform; the positioning bearing component is connected to the side, away from the hinge component, of the pressing arm component. Rapid positioning of the sun gear is achieved through the pressing arm structure, the structure is simple, and operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of sun gear positioning, in particular to a pressure arm structure. Background Art

[0002] The sun gear is a basic component of the epicyclic gear train. In the planetary gear train, the outer gear that serves as the central gear is called the sun gear.

[0003] Planetary gear transmission has been widely used in various intelligent manufacturing industries due to its advantages such as high load-bearing capacity and large speed ratio. In order to ensure the load-balancing effect, at least one floating part is required in the planetary transmission, and the sun gear is usually used as a floating part. Due to the complex load alternation of the planetary gear transmission, the positioning of the sun gear directly affects whether the transmission is smooth. For this reason, after the sun gear is manufactured, it is generally necessary to further position the sun gear, and the accuracy of the positioning directly affects the accuracy of subsequent testing.

[0004] In traditional sun gear positioning, the distance between the two left and right ribs is very close, and the positioning surface is a plane. However, the movement of the sun gear is not completely straight, and the radial and axial directions may intersect. Therefore, the contact at the positioning point is mostly line contact rather than surface contact, which will cause the right-angled side of the positioning plane to contact the rib first. Poor positioning will also cause wear, resulting in greater hidden dangers and other problems. Utility Model Content

[0005] The main purpose of the utility model is to provide a pressure arm structure to solve the technical problem that the poor positioning of the existing sun gear affects the accuracy of subsequent detection.

[0006] In order to achieve the above-mentioned purpose, the utility model proposes a pressure arm structure, which is used to position the sun gear placed on the positioning platform. The pressure arm structure includes:

[0007] A pressing cylinder component, one end of which is connected to the first direction of the positioning platform;

[0008] A hinged component connected to the pressing cylinder component;

[0009] A pressure arm component, one end of which is hinged on the hinge component;

[0010] A fulcrum seat, one end of which is hinged to the middle part of the pressure arm component, and the other end of which is connected to the second direction of the positioning platform; and

[0011] A positioning bearing component connected to a side of the pressure arm component away from the hinge component;

[0012] When the clamping cylinder component is working, the hinge component is driven to push back the pressure arm component, so that the pressure arm component swings around the fulcrum seat, thereby driving the positioning bearing component to press against the reference column of the sun gear.

[0013] Optionally, the clamping cylinder component includes a first connecting member with one end connected to the positioning platform, a clamping cylinder and a second connecting member connected to the hinged component, one end of the clamping cylinder is hinged to the first connecting member, and the other end is connected to the second connecting member.

[0014] Optionally, the first connecting member includes a right-angle bracket, a first angle fork and a first pin, wherein:

[0015] The right-angle bracket includes a horizontal plate and a vertical plate connected vertically, the vertical plate is connected to the side of the positioning platform, and the horizontal plate is connected to the top of the vertical plate;

[0016] The first angle fork head includes a first fork head seat connected to the pressing cylinder at one end and a first fork head and a second fork head connected to the other end of the pressing cylinder, and the first fork head and the second fork head are symmetrically arranged in parallel at one end of the horizontal plate;

[0017] The first pin rod is vertically and sequentially penetrated through the first fork head, the horizontal plate and the second fork head.

[0018] Optionally, the second connecting member includes a threaded sleeve with one end threadedly connected to the output shaft of the clamping cylinder and a locking nut, the threaded sleeve is connected to the hinged component at one end away from the clamping cylinder, and the locking nut is threadedly connected to the threaded sleeve.

[0019] Optionally, the pressure arm component includes a pressure arm body and a first connecting ear and a second connecting ear respectively connected to two ends of the pressure arm body, the first connecting ear is connected to the hinge component, and the second connecting ear is connected to the positioning bearing component.

[0020] Optionally, the hinged component includes a second angle fork head with one end connected to the threaded sleeve and a locking member connected to the first connecting ear;

[0021] The second angle fork head includes a second fork head seat and a third fork head and a fourth fork head connected to an end of the second fork head seat away from the threaded sleeve, and the third fork head and the fourth fork head are symmetrically arranged on the second fork head seat in parallel.

[0022] The locking member includes a first pin and a retaining spring, and the first pin is inserted through the third fork, the first connecting ear and the fourth fork, and the retaining spring is clamped on both end surfaces of the first pin located at the third fork and the fourth fork.

[0023] Optionally, a horizontal through slot and a vertical through pin hole are provided in the middle portion of the pressure arm body, and the pin hole is communicated with the through slot.

[0024] Optionally, the fulcrum seat includes a connecting plate vertically connected to the positioning platform, a plug plate horizontally connected to the top of the connecting plate, and a second pin rod, the plug plate is suitable for being horizontally inserted in the through groove, and the second pin rod is vertically penetrated in the pin hole to connect the pressure arm body with the plug plate.

[0025] Optionally, the positioning bearing component includes a bearing support, a bearing washer and a bearing, and the bearing is sleeved on the top end of the bearing support through the bearing washer.

[0026] Optionally, the sun gear includes a central gear column and a gear that are coaxially and integrally connected, and the central gear column is connected to the lower surface of the gear.

[0027] Compared with the prior art, the beneficial effects of the utility model are:

[0028] In the technical solution of the utility model, a pressure arm structure is installed on the side of the positioning platform, and a clamping cylinder component of the pressure arm structure is connected to the long side of the positioning platform. The other end of the pressure cylinder component is connected to the hinge component, and the hinge component is connected to the pressure arm component. The middle part of the pressure arm component is hinged to the fulcrum seat. Therefore, when the pressure cylinder component is working, it will drive the hinge component to move, and then pull or push the pressure arm component to rotate around the fulcrum seat. In addition, a positioning bearing component is provided on the side of the pressure arm component away from the fulcrum seat. Therefore, when the pressure cylinder component is extended, the positioning bearing component at the other end of the pressure arm component will be driven to approach and fit the sun gear, so that the sun gear is positioned under the joint action of three points. The clamping cylinder component serves as the driving force source of the clamping arm structure. One end of the clamping cylinder component is connected to the first direction of the positioning platform to provide support for the installation of the clamping cylinder component. The hinged component is connected to the clamping cylinder component. When the clamping cylinder component makes relative movement, it can drive the hinged component to move. One end of the clamping arm component is hinged to the hinged component. One end of the fulcrum seat is hinged to the middle part of the clamping arm component, and the other end of the fulcrum seat is connected to the second direction of the positioning platform. Therefore, the clamping arm component can rotate freely under the action of the fulcrum seat. The positioning bearing component is connected to the side of the clamping arm component away from the hinged component. When the clamping cylinder component is working, the hinged component is driven to push the clamping arm component back so that the clamping arm component swings around the fulcrum seat, thereby driving the positioning bearing component to press against the reference column of the sun gear. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0030] Figure 1 It is a three-dimensional structural schematic diagram of the pressure arm structure acting on the sun gear on the positioning platform in the embodiment of the utility model;

[0031] Figure 2 It is a schematic diagram of a top view of the structure of the pressure arm structure acting on the sun gear on the positioning platform in the embodiment of the utility model;

[0032] Figure 3 This is a schematic diagram of the structure of the pressure arm structure in one direction in an embodiment of the utility model;

[0033] Figure 4 It is a schematic diagram of the assembly structure of the pressing cylinder component and the hinge component in the embodiment of the utility model;

[0034] Figure 5This is a schematic diagram of the structure of the pressure arm component in the embodiment of the utility model;

[0035] Figure 6 A schematic diagram of the three-dimensional structure of the hinged component in the embodiment of the utility model;

[0036] Figure 7 It is a schematic diagram of the exploded structure of the positioning bearing component in the embodiment of the utility model.

[0037] Description of Figure Numbers:

[0038] 1-Tighten the cylinder parts;

[0039] 11-first connecting member; 111-right angle bracket; 1111-horizontal plate; 1112-vertical plate; 112-first angle fork; 1121-first fork seat; 1122-first fork; 1123-second fork; 113-first pin;

[0040] 12-Compression cylinder;

[0041] 13-second connecting piece; 131-threaded sleeve; 132-locking nut;

[0042] 2- hinged parts;

[0043] 21-second angle fork; 211-second fork seat; 2111-first screw hole; 212-third fork; 213-fourth fork; 22-locking member; 221-first pin; 222-circlip;

[0044] 3-pressing arm component; 31-pressing arm body; 311-through slot; 312-pin hole; 32-first connecting ear; 33-second connecting ear; 331-mounting hole;

[0045] 4-fulcrum seat; 41-connecting plate; 42-insertion plate; 43-second pin rod;

[0046] 5-positioning bearing component; 51-bearing support; 52-bearing washer; 53-bearing;

[0047] 6-sun gear; 61-center gear column; 62-gear;

[0048] 7- Positioning platform. DETAILED DESCRIPTION

[0049] 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.

[0050] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0051] In addition, if there are descriptions involving "first", "second", "third", etc. in the embodiments of the utility model, the descriptions of "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting 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 utility model.

[0052] See also Figure 1-7 As shown, the utility model provides a pressure arm structure, which is used to position the sun gear 6 placed on the positioning platform 7. The pressure arm structure in this embodiment includes a pressing cylinder component 1, a hinge component 2, a pressure arm component 3, a fulcrum seat 4 and a positioning bearing component 5, wherein:

[0053] The pressing cylinder component 1 is used as the driving force source of the pressing arm structure. One end of the pressing cylinder component 1 is connected to the first direction (that is, the attached Figure 1 The hinged member 2 is connected to the pressing cylinder member 1. When the pressing cylinder member 1 makes a relative movement, the hinged member 2 can be driven to move. One end of the pressing arm member 3 is hinged to the hinged member 2. One end of the fulcrum seat 4 is hinged to the middle part of the pressing arm member 3. The other end of the fulcrum seat 4 is hinged to the second direction of the positioning platform 7 (that is, the attached Figure 1 Therefore, the pressure arm component 3 can rotate freely under the action of the fulcrum seat 4, and the positioning bearing component 5 is connected to the side of the pressure arm component 3 away from the hinge component 2.

[0054] When the clamping cylinder component 1 is working, the hinge component 2 is driven to push back the clamping arm component 3, so that the clamping arm component 3 swings around the fulcrum seat 4, thereby driving the positioning bearing component 5 to press against the reference column of the sun gear 6.

[0055] Specifically, see Figure 1 As shown, in the embodiment of the utility model, since the sun gear 6 is placed on the positioning platform 7, two positioning columns are provided on the side of the positioning platform 7 close to the sun gear 6. At this time, only a positioning bearing component 5 needs to be provided on the other side of the sun gear 6. The sun gear 6 can be fixed under the joint action of the two positioning columns and one positioning bearing component 5.

[0056] To this end, in this embodiment, a pressure arm structure is installed on the side of the positioning platform 7, and the pressure cylinder component 1 of the pressure arm structure is connected to the long side of the positioning platform 7, and the other end of the pressure cylinder component 1 is connected to the hinge component 2, and the hinge component 2 is connected to the pressure arm component 3, and the middle part of the pressure arm component 3 is hinged to the fulcrum seat 4. Therefore, when the pressure cylinder component 1 is working, it will drive the hinge component 2 to move, and then pull or push the pressure arm component 3 to rotate around the fulcrum seat 4. In addition, a positioning bearing component 5 is provided on the side of the pressure arm component 3 away from the fulcrum seat 4. Therefore, when the pressure cylinder component 1 is extended, the positioning bearing component 5 at the other end of the pressure arm component 3 will be driven to approach and fit the sun gear 6, so that the sun gear 6 is positioned under the joint action of three points.

[0057] Furthermore, the clamping cylinder component 1 includes a first connecting member 11 connected to the positioning platform 7 at one end, a clamping cylinder 12 and a second connecting member 13 connected to the hinged component 2, one end of the clamping cylinder 12 is hinged to the first connecting member 11, and the other end is connected to the second connecting member 13.

[0058] Specifically, see Figure 1 , 2 As shown, in an embodiment of the utility model, the clamping cylinder component 1 is composed of a first connecting member 11, a clamping cylinder 12 and a second connecting member 13, wherein the first connecting member 11 is connected to the positioning platform 7 as a bearing point for providing the clamping cylinder component 1, and the second connecting member 13 is connected to the clamping cylinder 12 for transmitting the torque of the output shaft of the clamping cylinder component 1 to the pressure arm component 3 through the second connecting member 13.

[0059] Furthermore, the first connecting member 11 includes a right-angle bracket 111, a first angle fork head 112 and a first pin 113, wherein:

[0060] The right-angle bracket 111 includes a horizontal plate 1111 and a vertical plate 1112 connected vertically, the vertical plate 1112 is connected to the side of the positioning platform 7, and the horizontal plate 1111 is connected to the top of the vertical plate 1112;

[0061] The first angle fork 112 includes a first fork seat 1121 connected to the pressing cylinder 12 at one end, and a first fork 1122 and a second fork 1123 connected to the other end of the pressing cylinder 12, and the first fork 1122 and the second fork 1123 are vertically parallel and symmetrically arranged at a corner of the horizontal plate 1111;

[0062] The first pin 113 is vertically disposed on the first fork 1122 , the horizontal plate 1111 and the second fork 1123 in sequence.

[0063] Specifically, see Figure 3 As shown, in an embodiment of the utility model, the first connecting member 11 is composed of a right-angle bracket 111, a first angle fork head 112 and a first pin rod 113, wherein the right-angle bracket 111 is configured as a right-angle plate structure, half of which is vertically connected to the side of the positioning platform 7, and the other half is horizontally connected to the first angle fork head 112 and locked by the first pin rod 113.

[0064] The first angle fork 112 is composed of a first fork seat 1121, a first fork 1122 and a second fork 1123, wherein the first fork seat 1121 is used to connect with the clamping cylinder 12, and the first fork 1122 and the second fork 1123 are horizontally connected to the first fork seat 1121 with a certain gap between them, so that the horizontal plate 1111 of the right-angle bracket 111 can be inserted into the gap between the first fork 1122 and the second fork 1123, and then the first pin 113 is used to lock the first angle fork 112 and the right-angle bracket 111 together, so that the clamping cylinder 12 can be rotated through the first connecting piece 11 to facilitate the adjustment of the direction.

[0065] Furthermore, the second connecting member 13 includes a threaded sleeve 131 and a locking nut 132 , one end of which is threadedly connected to the output shaft of the clamping cylinder 12 . The end of the threaded sleeve 131 away from the clamping cylinder 12 is connected to the hinged component 2 , and the locking nut 132 is threadedly connected to the threaded sleeve 131 .

[0066] Specifically, see Figure 3 , 4 As shown, in the embodiment of the utility model, the second connecting member 13 is composed of a threaded sleeve 131 and a locking nut 132, wherein one end of the threaded sleeve 131 is threadedly connected to the output shaft of the clamping cylinder 12, and a thread is also provided on the upper circumference of the threaded sleeve 131. The locking nut 132 is threadedly connected to the threaded sleeve 131, so that the second connecting member 13 can be connected to the clamping cylinder 12 together.

[0067] Furthermore, the pressure arm component 3 includes a pressure arm body 31 and a first connecting ear 32 and a second connecting ear 33 respectively connected to both ends of the pressure arm body 31 . The first connecting ear 32 is connected to the hinge component 2 , and the second connecting ear 33 is connected to the positioning bearing component 5 .

[0068] Specifically, see Figure 5 As shown, in the embodiment of the utility model, the pressure arm component 3 is composed of a pressure arm body 31, a first connecting ear 32 and a second connecting ear 33. The first connecting ear 32 and the second connecting ear 33 are respectively connected to the two sides of the pressure arm body 31, and the first connecting ear 32 is suitable for being horizontally inserted in the hinged component 2 and connected by a locking connection, so that the pressure arm component 3 can rotate relative to the hinged component 2; and the second connecting ear 33 is used to install the positioning bearing component 5. Therefore, the positioning bearing component 5 can be driven by the pressure arm component 3 to approach and fit the sun gear 6 on the positioning platform 7.

[0069] Further, the hinged component 2 includes a second angle fork head 21 connected to the threaded sleeve 131 at one end and a locking member 22 connected to the first connecting ear 32;

[0070] The second angle fork head 21 includes a second fork head seat 211 and a third fork head 212 and a fourth fork head 213 connected to an end of the second fork head seat 211 away from the threaded sleeve 131, and the third fork head 212 and the fourth fork head 213 are vertically parallel and symmetrically arranged on the second fork head seat 211;

[0071] The locking member 22 includes a first pin 221 and a retaining spring 222 . The first pin 221 passes through the third fork 212 , the first connecting ear 32 and the fourth fork 213 . The retaining spring 222 is clamped on both end surfaces of the first pin 221 located at the third fork 212 and the fourth fork 213 .

[0072] Specifically, see Figure 5 As shown, in the embodiment of the utility model, the hinge part 2 is composed of a second angle fork head 21 and a locking member 22, wherein the second angle fork head 21 has a similar structure to the first angle fork head 112, and is also composed of a second fork head seat 211, a third fork head 212 and a fourth fork head 213. The second fork head seat 211 is used to connect with one end of the threaded sleeve 131, and the third fork head 212 and the fourth fork head 213 are symmetrically arranged on the second fork head seat 211 in parallel from top to bottom. The first connecting ear 32 is used between the third fork head 212 and the fourth fork head 213. The hinge part 2 can be connected to the pressure arm part 3 through the first pin shaft 221 and the retaining spring 222.

[0073] Furthermore, a horizontal through slot 311 and a vertical through pin hole 312 are formed in the middle of the pressure arm body 31 , and the pin hole 312 is communicated with the through slot 311 .

[0074] Specifically, see Figure 5 As shown, in the embodiment of the utility model, a through slot 311 and a pin hole 312 are provided on the pressure arm body 31 for connecting with the fulcrum seat 4 , so that the pressure arm body 31 is conveniently fixed on the positioning platform 7 .

[0075] Furthermore, the fulcrum seat 4 includes a connecting plate 41 vertically connected to the positioning platform 7, an insert plate 42 horizontally connected to the top of the connecting plate 41, and a second pin rod 43. The insert plate 42 is suitable for being horizontally inserted in the through groove 311, and the second pin rod 43 is vertically penetrated in the pin hole 312 to connect the pressure arm body 31 with the insert plate 42.

[0076] Specifically, see Figure 3 As shown, in the embodiment of the utility model, the fulcrum seat 4 is composed of a connecting plate 41, an insert plate 42 and a second pin rod 43. The insert plate 42 can be horizontally inserted in the through groove 311, and the second pin rod 43 is vertically penetrated in the pin hole 312, so that the pressure arm body 31 can be connected with the insert plate 42, and the pressure arm component 3 can be rotated relative to the fulcrum seat 4.

[0077] Furthermore, the positioning bearing component 5 includes a bearing support 51 , a bearing washer 52 and a bearing 53 , and the bearing 53 is sleeved on the top end of the bearing support 51 through the bearing washer 52 .

[0078] Specifically, see Figure 7 As shown, in the embodiment of the utility model, the positioning bearing component 5 is composed of a bearing support 51, a bearing washer 52 and a bearing 53, wherein the bearing 53 is fixed at the top end of the bearing support 51, so that the bearing 53 can be fitted and positioned with the sun gear 6.

[0079] See also Figure 3 As shown, in the embodiment of the present utility model, the sun gear 6 includes a central gear column 61 and a gear 62 which are coaxially connected and integrally connected, and the central gear column 61 is connected to the lower surface of the gear 62. Considering that the manufacturing and processing datum of the central gear column 61 and the gear 62 are consistent, as long as the central gear column 61 can be accurately positioned, the positioning of the gear 62 can be ensured to be accurate.

[0080] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A pressure arm structure for positioning a sun gear (6) placed on a positioning platform (7), characterized in that: The pressure arm structure comprises: A pressing cylinder component (1), one end of which is connected to a first direction on the positioning platform (7); A hinge component (2) connected to the pressing cylinder component (1); A pressure arm component (3), one end of which is hinged on the hinge component (2); A fulcrum seat (4), one end of which is hinged to the middle part of the pressure arm component (3), and the other end of which is connected to the second direction of the positioning platform (7); and A positioning bearing component (5) connected to a side of the pressure arm component (3) away from the hinge component (2); When the pressing cylinder component (1) is working, it drives the hinge component (2) to push back the pressing arm component (3), so that the pressing arm component (3) swings around the fulcrum seat (4), thereby driving the positioning bearing component (5) to press against the reference column of the sun gear (6).

2. The pressure arm structure according to claim 1, characterized in that: The clamping cylinder component (1) comprises a first connecting member (11) having one end connected to the positioning platform (7), a clamping cylinder (12), and a second connecting member (13) connected to the hinged component (2); one end of the clamping cylinder (12) is hinged to the first connecting member (11), and the other end is connected to the second connecting member (13).

3. The pressure arm structure according to claim 2, characterized in that: The first connecting member (11) comprises a right-angle bracket (111), a first angle fork head (112) and a first pin rod (113), wherein: The right-angle bracket (111) comprises a horizontal plate (1111) and a vertical plate (1112) connected vertically, the vertical plate (1112) being connected to the side of the positioning platform (7), and the horizontal plate (1111) being connected to the top of the vertical plate (1112); The first angle fork (112) comprises a first fork seat (1121) connected to the pressing cylinder (12) at one end, and a first fork (1122) and a second fork (1123) connected to the other end of the pressing cylinder (12), and the first fork (1122) and the second fork (1123) are arranged vertically parallel and symmetrically at a corner of the horizontal plate (1111); The first pin rod (113) is vertically inserted through the first fork head (1122), the horizontal plate (1111) and the second fork head (1123) in sequence.

4. The pressure arm structure according to claim 3, characterized in that: The second connecting member (13) comprises a threaded sleeve (131) having one end threadedly connected to the output shaft of the pressing cylinder (12) and a locking nut (132); the end of the threaded sleeve (131) away from the pressing cylinder (12) is connected to the hinged member (2), and the locking nut (132) is threadedly connected to the threaded sleeve (131).

5. The pressure arm structure according to claim 4, characterized in that: The pressure arm component (3) comprises a pressure arm body (31) and a first connecting ear (32) and a second connecting ear (33) respectively connected to two ends of the pressure arm body (31); the first connecting ear (32) is connected to the hinge component (2), and the second connecting ear (33) is connected to the positioning bearing component (5).

6. The pressure arm structure according to claim 5, characterized in that: The hinged component (2) comprises a second angle fork head (21) with one end connected to the threaded sleeve (131) and a locking member (22) connected to the first connecting ear (32); The second angle fork head (21) comprises a second fork head seat (211) and a third fork head (212) and a fourth fork head (213) connected to an end of the second fork head seat (211) away from the threaded sleeve (131), and the third fork head (212) and the fourth fork head (213) are symmetrically arranged on the second fork head seat (211) in parallel up and down. The locking member (22) comprises a first pin shaft (221) and a retaining spring (222), wherein the first pin shaft (221) is inserted through the third fork head (212), the first connecting ear (32) and the fourth fork head (213), and the retaining spring (222) is clamped on both end surfaces of the first pin shaft (221) located at the third fork head (212) and the fourth fork head (213).

7. The pressure arm structure according to claim 5, characterized in that: A horizontal through slot (311) and a vertical through pin hole (312) are also provided in the middle of the pressure arm body (31), and the pin hole (312) is communicated with the through slot (311).

8. The pressure arm structure according to claim 7, characterized in that: The fulcrum seat (4) comprises a connecting plate (41) vertically connected to the positioning platform (7), a plug plate (42) horizontally connected to the top of the connecting plate (41), and a second pin rod (43), wherein the plug plate (42) is suitable for being horizontally inserted into the through groove (311), and the second pin rod (43) is vertically penetrated into the pin hole (312) to connect the pressure arm body (31) with the plug plate (42).

9. The pressure arm structure according to claim 8, characterized in that: The positioning bearing component (5) comprises a bearing support (51), a bearing washer (52) and a bearing (53); the bearing (53) is sleeved on the top end of the bearing support (51) via the bearing washer (52).

10. The pressure arm structure according to claim 9, characterized in that: The sun gear (6) comprises a central gear column (61) and a gear (62) which are coaxially and integrally connected, and the central gear column (61) is connected to the lower surface of the gear (62).

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