front loading

Abstract

The application provides a front loading, which comprises an indicating part, a calibration part and a supporting part. One end of the indicating part is connected to a connecting rod assembly, and the other end is fixed to a driving assembly through the supporting part. The calibration part is arranged on the indicating part at a position corresponding to the supporting part when the driving assembly drives the bucket to be parallel to the ground. When the driving assembly drives the bucket to rotate, the relative position change between the calibration part and the supporting part is observed to determine the state of the bucket. The application adopts the structure of the calibration part and the supporting part without affecting the functions and performances of other components. The relative positions of the calibration part and the supporting part are exposed during the whole working stroke of the bucket, which is convenient for the operator to observe and determine the state of the bucket according to the positions, and the use efficiency of the front loading is improved.

Description

Technical Field

[0001] This application relates to the field of loading technology, and more particularly to front loading. Background Technology

[0002] The position indicator post is an important component of the front-loading machine. When operating the front-loading machine, the operator's view is often obstructed by the tractor cab, making it impossible to see the working position and status of the bucket. This affects the operator's efficiency in scooping or lifting materials and reduces the ease of use of the bucket. The position indicator post allows the operator to easily observe the marked positions on the post, constantly monitoring the bucket's location and status, thus improving the efficiency of the front-loading machine.

[0003] The current position indicator structure is as follows: The position indicator structure includes a guide post and a support sleeve. The guide post can move within the support sleeve. When the top of the guide post moves to be flush with the end of the support sleeve, it indicates that the bucket is in a material-scooping state at ground level. When the bucket continues to rotate downwards to unload, the top of the guide post moves into the support sleeve, making it impossible to observe the marked position and thus impossible to determine the bucket's status, affecting the use of the front-loading mechanism.

[0004] Therefore, preloading is urgently needed to address the technical problems existing in the current technology to some extent. Utility Model Content

[0005] The purpose of this application is to provide a front-loading device that, without affecting the function and performance of other components, adopts a calibration structure with an indicator, calibration section, and support section that is exposed throughout the entire working stroke of the bucket. This allows the operator to observe and judge the bucket status based on its position, thereby improving the efficiency of the front-loading device.

[0006] This application provides a front loading system, including a bucket, a linkage assembly connected to the bucket, and a drive assembly connected to the linkage assembly; the drive assembly can drive the bucket to rotate by driving the linkage assembly; the front loading system also includes an indicator assembly.

[0007] The indicating component includes an indicating part, a calibration part, and a support part; one end of the indicating part is connected to the linkage assembly, and the other end is fixed to the drive assembly through the support part; the calibration part is disposed on the indicating part at the position corresponding to the support part when the drive assembly drives the bucket to be parallel to the ground.

[0008] In the above technical solution, the indicating part is further defined as an indicating rod;

[0009] The first end of the indicator rod is connected to the linkage assembly, and the second end extends along the length direction parallel to the drive assembly and is supported by the support portion on the drive assembly.

[0010] In the above technical solution, the support part further includes a clamp and a support rod;

[0011] The clamp includes two opposing rings that can enclose a snap-fit ​​space. The snap-fit ​​space can be fitted onto the end of the drive assembly away from the connecting rod assembly, and the clamp can be fixed to the drive assembly through a first connector.

[0012] The support rod has a fixed end and a sleeve end at its two ends along its axial direction. The fixed end of the support rod is fixedly connected to one of the retaining rings at a first preset angle, and the sleeve end is sleeved on the indicator rod.

[0013] In the above technical solution, the end of the support rod away from the clamp is bent into a circular structure, which can serve as the sleeve end and be sleeved on the indicator rod.

[0014] In the above technical solution, the calibration part is further defined as a reflective strip;

[0015] The reflective strip is affixed to the position of the indicator rod corresponding to the circular structure when the drive assembly drives the bucket parallel to the ground.

[0016] In the above technical solution, the calibration part is further defined as a paint layer;

[0017] The paint layer is applied to the position of the indicator bar corresponding to the circular structure when the drive assembly drives the bucket parallel to the ground.

[0018] In the above technical solution, the linkage assembly further includes a first linkage and a second linkage;

[0019] One end of the first connecting rod is hinged to one end of the second connecting rod via a first pin; the end of the first connecting rod opposite to the second connecting rod is hinged to the bucket via a second pin; the end of the second connecting rod opposite to the first connecting rod is hinged to the drive assembly via a third pin.

[0020] The first end of the indicator rod is connected to the end of the first pin through a second connector.

[0021] In the above technical solution, the indicator rod further includes a main body and a bent portion that can serve as the first end;

[0022] The bent portion is connected to the main body at a second preset angle at the end of the main body away from the support rod;

[0023] The second connector passes through the bend and connects the bend to the end of the first pin.

[0024] In the above technical solution, the second connecting member further includes a connecting bolt, a hexagonal nut, and a locking nut;

[0025] The connecting bolt is fixed to the end of the first pin by a hexagonal nut, and the locking nut is screwed onto the shank of the connecting bolt, forming a movable space between the locking nut and the head of the connecting bolt; the indicator rod is sleeved on the shank of the connecting bolt located in the movable space, and can rotate around the shank of the connecting bolt.

[0026] In the above technical solution, the driving assembly further includes a hydraulic cylinder and a driving arm; the output end of the hydraulic cylinder is hinged to the first pin; one end of the driving arm is hinged to the fixed end of the hydraulic cylinder through a transition plate; the other end of the driving arm is hinged to the end of the second connecting rod opposite to the first connecting rod.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] This application provides a front loading system, including a bucket, a linkage assembly connected to the bucket, and a drive assembly connected to the linkage assembly; the drive assembly can drive the bucket to rotate by driving the linkage assembly; the front loading system also includes an indicator assembly.

[0029] The indicating component includes an indicating part, a calibration part, and a support part; one end of the indicating part is connected to the linkage assembly, and the other end is fixed to the drive assembly via the support part; the calibration part is disposed on the indicating part at the position corresponding to the support part when the drive assembly drives the bucket to be parallel to the ground;

[0030] When the drive assembly drives the bucket to rotate, the relative position change between the calibration part and the support part is observed to determine the state of the bucket.

[0031] In summary, this application adopts a calibration section and a support section structure without affecting the function and performance of other components. The relative positions of the calibration section and the support section are exposed throughout the entire working stroke of the bucket, which makes it easy for the operator to observe and judge the bucket status based on the position, thereby improving the efficiency of front loading. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 A schematic diagram of the structure provided in this application with the bottom surface of the bucket parallel to the ground during front loading;

[0034] Figure 2 for Figure 1 Enlarged view of point A in the image;

[0035] Figure 3 Top view of the front loading provided for this application;

[0036] Figure 4 for Figure 3 Enlarged view of point B in the image;

[0037] Figure 5 for Figure 3 Enlarged view of point C in the image.

[0038] Reference numerals: 1-bucket; 101-auxiliary plate; 103-material pile; 104-ground;

[0039] 2-Link assembly; 201-First link; 202-Second link; 203-First pin; 204-Second pin; 205-Third pin; 206-Fourth pin;

[0040] 3-Drive assembly; 301-Hydraulic cylinder; 302-Drive arm; 303-Adapter plate; 304-Fifth pin;

[0041] 401-Indicator section; 402-Calibration section; 403-Support section; 404-Indicator rod; 405-Clamp; 406-Support rod; 407-Snap ring; 408-First connector; 409-Fixed end; 410-Sleeve end; 411-Circular structure; 412-Reflective strip; 413-Second connector; 414-Main body; 415-Bending section; 416-Head of connecting bolt; 417-Hexagonal nut; 418-Locking nut; 419-Ramp of connecting bolt. Detailed Implementation

[0042] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order presented herein; rather, changes that will be apparent upon understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity. The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application. Throughout this specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. Conversely, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between. As used herein, the term "and / or" includes any one of the relevant items listed and any combination of any two or more of them. Although terms such as "first," "second," and "third" may be used herein to describe individual components, assemblies, regions, layers, or portions, these components, assemblies, regions, layers, or portions are not limited by these terms. More precisely, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as such in the examples may also be referred to as the second component, assembly, region, layer, or part. For ease of description, spatial relational terms such as “above,” “upper,” “below,” and “lower” may be used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relational terms are intended to include not only the orientation depicted in the drawings but also the different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element.Therefore, the term "above" includes both "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., oscillating 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly. The terminology used herein is for describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprising," "including," and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. Variations in the shapes shown in the figures may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the figures but include changes in shape that occur during manufacturing. The features of the examples described herein may be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible as will be apparent upon understanding the disclosure of this application.

[0043] The existing positioning rod structure includes a guide post and a support sleeve. The guide post can move within the support sleeve. When the top of the guide post moves to be flush with the end of the support sleeve, it indicates that the bucket 1 is in a material-scooping state at the ground level 104. When the bucket 1 continues to rotate downwards to unload material, the top of the guide post moves into the support sleeve. However, after the top of the guide post moves into the support sleeve, the operator cannot observe the specific position of the top of the guide post inside the support sleeve, which will lead to the inability to observe the marked position and thus the inability to determine the state of the bucket 1, thereby affecting the use of the front loading mechanism. Based on this, this application provides a front loading mechanism, which is described below in conjunction with... Figures 1-5 This preloading process will be described in detail.

[0044] Combination Figure 1 As shown, the front loading includes a bucket 1, a linkage assembly 2 connected to the bucket 1, and a drive assembly 3 connected to the linkage assembly 2; the drive assembly 3 can drive the bucket 1 to rotate by driving the linkage assembly 2, that is, the bucket 1 can pick up or unload materials.

[0045] Still combined Figure 1As shown, the front loading also includes an indicator assembly; the indicator assembly includes an indicator part 401, a calibration part 402, and a support part 403. One end of the indicator part 401 is connected to the linkage assembly 2, and the other end extends in a direction parallel to the drive assembly 3 and is fixed to the end of the drive assembly 3 away from the linkage assembly 2 through the support part 403. The calibration part 402 is positioned on the indicator part 401 corresponding to the support part 403 when the drive assembly 3 drives the bucket 1 parallel to the ground 104. In other words, with the bucket 1 parallel to the ground 104 as a reference, the calibration part 402 is positioned on the indicator part 401 corresponding to the support part 403. In actual use, when the drive assembly 3 drives the linkage assembly 2 to swing, since one end of the indicator part 401 is connected to the linkage assembly 2, the indicator part 401 will swing along with the linkage assembly 2. Since the other end of the indicator part 401 is supported by the support part 403 on the end of the drive assembly 3 away from the linkage assembly 2, and the indicator part 401 is parallel to the extension direction of the drive assembly 3, the calibration part 402 on the indicator part 401 will have a positional change relative to the support part 403 when the drive assembly 3 drives the linkage assembly 2 to swing. By observing the relative positional change between the calibration part 402 and the support part 403 and the amount of the change, the state of the bucket 1 can be determined. Furthermore, when the bottom of the bucket 1 is parallel to the ground 104 (in preparation for removing material from the stockpile 103), the calibration part 402 corresponds precisely to the position of the support part 403, so that... Figure 1 For example, when the drive assembly 3 drives the linkage assembly 2 to swing clockwise, it will cause the bucket 1 to swing clockwise, and at the same time, it will also cause the indicator 401 to swing clockwise. When the indicator 401 swings clockwise, it will move in an upward direction, which will cause the calibration part 402 to be located above the support part 403. Similarly, when the drive assembly 3 drives the linkage assembly 2 to swing counterclockwise, it will cause the bucket 1 to swing counterclockwise, and at the same time, it will also cause the indicator 401 to swing counterclockwise. When the indicator 401 swings counterclockwise, it will move in a downward direction, which will cause the calibration part 402 to be located below the support part 403. Therefore, in actual use, by observing the relative position of the calibration part 402 and the support part 403, the rotation state of the bucket 1 can be determined.

[0046] It is worth noting that the above swinging motion can also be understood as a rotational motion, but the rotation is within a certain angular range and cannot achieve a 180° rotation.

[0047] In summary, without affecting the function and performance of other components, this application adopts a structure of calibration part 402 and support part 403. The relative positions of calibration part 402 and support part 403 are exposed throughout the entire working stroke of bucket 1. Compared with the existing guide rods that move inside the guide sleeve and cannot be observed by the operator, this application makes it easier for the operator to observe and judge the status of bucket 1 based on the position. Furthermore, the marked position can be observed throughout the entire working cycle of bucket 1, thus improving the efficiency of front loading.

[0048] In this embodiment, further combined Figure 1 As shown, the indicator part 401 is an indicator rod 404, which can optionally be a cold-drawn tube. The first end of the indicator rod 404 is connected to the linkage assembly 2, and the second end extends along the length direction parallel to the drive assembly 3, and is supported by the support part 403 at the end of the drive assembly 3 away from the linkage assembly 2. When the drive assembly 3 drives the linkage assembly 2 to swing clockwise, it will cause the bucket 1 to swing clockwise, and at the same time, it will also cause the indicator rod 404 to swing clockwise. When the indicator rod 404 swings clockwise, it will move in an upward direction, which will cause the calibration part 402 to be located above the support part 403. Similarly, when the drive assembly 3 drives the linkage assembly 2 to swing counterclockwise, it will cause the bucket 1 to swing counterclockwise, and at the same time, it will also cause the indicator rod 404 to swing counterclockwise. When the indicator rod 404 swings counterclockwise, it will move in a downward direction, which will cause the calibration part 402 to be located below the support part 403.

[0049] In this embodiment, further, combined with Figures 1-4 As shown, the support part 403 includes a clamp 405 and a support rod 406. The clamp 405 includes two semi-circular retaining rings 407. The two semi-circular retaining rings 407 are opposite each other and can form a retaining space. The retaining space can be fitted onto the end of the drive assembly 3 away from the connecting rod assembly 2, and the clamp 405 can be fixed to the end of the drive assembly 3 away from the connecting rod assembly 2 through the first connector 408.

[0050] Specifically, each end of the retaining ring 407 extends outward with connecting ears. The connecting ears of the two retaining rings 407 are positioned opposite each other. The first connecting member 408 passes through the connecting ears, thereby fixing the two retaining rings 407 onto the drive assembly 3. Further, the first connecting member 408 includes an adjusting bolt and an adjusting nut. The adjusting bolt passes through the two connecting ears of the two retaining rings 407 in sequence, and the adjusting nut is screwed onto the adjusting bolt to fix the two retaining rings 407.

[0051] The support rod 406 has a fixed end 409 and a sleeve end 410 at its two ends along its axial direction. The fixed end 409 of the support rod 406 is fixedly connected to one of the retaining rings 407 at a first preset angle. Optionally, the fixed end 409 of the support rod 406 is welded to one of the retaining rings 407 at the first preset angle. Alternatively, the first preset angle is 90°, that is, the fixed end 409 of the support rod 406 is perpendicular to the top of the semi-circular retaining ring 407. In addition, the sleeve end 410 is sleeved on the end of the indicator rod 404 that is away from the connecting rod assembly 2.

[0052] Specifically, the end of the support rod 406 facing away from the clamp 405 is bent into a circular structure 411. The circular structure 411 can serve as a sleeve end 410 and is sleeved on the end of the indicator rod 404 facing away from the connecting rod assembly 2. That is, in actual use, when the drive assembly 3 drives the bucket 1 to move through the drive connecting rod assembly 2, the first end of the indicator rod 404 swings with the connecting rod assembly 2, while the second end can move obliquely upward or downward within the circular structure 411. This allows the state of the bucket 1 to be determined by observing the relative position change between the calibration part 402 and the circular structure 411.

[0053] Furthermore, the contact surface between the indicator 401 and the circular structure 411 refers to the position of the circular structure 411 facing the indicator 401 and corresponding to the indicator 401. Compared to existing guide rods located inside the guide sleeve, the contact surface between the indicator 401 and the circular structure 411 in this application is smaller. This smaller contact surface design, compared to existing designs where the guide rod might break inside the guide sleeve if the bucket 1 swings too much, prevents the indicator 401 from moving within the circular structure 411, thus avoiding excessive interference from the circular structure 411 and preventing the indicator 401 from breaking. In addition, the circular structure 411 not only serves for comparative observation but also provides support for the indicator rod 404.

[0054] In this embodiment, optionally, the calibration part 402 is a reflective strip 412; the reflective strip 412 is affixed to the position of the circular structure 411 on the indicator rod 404 when the drive assembly 3 drives the bucket 1 parallel to the ground 104.

[0055] In this embodiment, optionally, the calibration part 402 is a paint layer; the paint layer is applied to the position of the circular structure 411 on the indicator rod 404 when the drive assembly 3 drives the bucket 1 parallel to the ground 104.

[0056] In this embodiment, further, combined with Figure 1As shown, the linkage assembly 2 includes a first linkage 201 and a second linkage 202; wherein one end of the first linkage 201 and one end of the second linkage 202 are hinged by a first pin 203; wherein the end of the first linkage 201 opposite to the second linkage 202 is hinged to the bucket 1 by a second pin 204; wherein the end of the second linkage 202 opposite to the first linkage 201 is hinged to the drive assembly 3 by a third pin 205.

[0057] Specifically, the linkage assembly 2 also includes an auxiliary plate 101 and a fourth pin 206; wherein the auxiliary plate 101 is fixedly connected to the bucket 1, one end of the first link 201 and the second link 202 are hinged by the first pin 203, the end of the first link 201 away from the second link 202 is rotatably connected to the auxiliary plate 101 by the second pin 204, the end of the second link 202 away from the first link 201 is hinged to the drive assembly 3 by the third pin 205, and the end of the auxiliary plate 101 is connected to the drive assembly 3 by the fourth pin 206. That is, the first link 201, the second link 202, the auxiliary plate 101 and the drive assembly 3 between the third pin 205 and the fourth pin 206 together constitute a four-bar linkage structure.

[0058] Specifically, the first end of the indicator rod 404 is connected to the end of the first pin 203 via the second connector 413, and the other end of the indicator rod 404 can pass through the circular structure 411. In particular, it is still combined with... Figure 1 As shown, the indicator rod 404 includes a main body 414 and a bent portion 415 that can serve as a first end; the bent portion 415 is connected to the main body 414 at a second preset angle at the end of the main body 414 away from the support rod 406; a second connector 413 passes through the bent portion 415 and connects the bent portion 415 to the end of the first pin 203. Optionally, the second preset angle is 90°.

[0059] Furthermore, the second connector 413 includes a connecting bolt, a hexagonal nut 417, and a locking nut 418. The connecting bolt passes through the bend 415 and is fixed to the end of the first pin 203 by the hexagonal nut 417, which prevents the connecting bolt from loosening. The locking nut 418 is screwed onto the shank 419 of the connecting bolt, and there is a space between it and the head 416 of the connecting bolt. That is, the indicator rod 404 is fitted onto the shank 419 of the connecting bolt located in the space, and can rotate around the shank 419 of the connecting bolt, so that the body 414 of the indicator rod 404 can always be parallel to the drive assembly 3.

[0060] In summary, the indicator rod 404 is installed at the end of the first pin 203 by connecting bolts, hexagonal nuts 417 and locking nuts 418, and the whole structure is simple.

[0061] In this embodiment, further, combined with Figure 1 As shown, the drive assembly 3 includes a hydraulic cylinder 301 and a drive arm 302; wherein, the output end of the hydraulic cylinder 301 is hinged to the first pin 203; one end of the drive arm 302 is hinged to the fixed end 409 of the hydraulic cylinder 301 through a transition plate 303 and a fifth pin 304; the other end of the drive arm 302 is hinged to the end of the second connecting rod 202 away from the first connecting rod 201; in addition, the auxiliary plate 101 is also hinged to the end of the drive arm 302 through a fourth pin 206.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A front-loading device, comprising a bucket, a linkage assembly connected to the bucket, and a drive assembly connected to the linkage assembly; characterized in that, The preloading also includes an indicator component; The indicating component includes an indicating part, a calibration part, and a support part; one end of the indicating part is connected to the linkage assembly, and the other end is connected to the drive assembly through the support part; the calibration part is located on the indicating part corresponding to the position of the support part when the bucket is parallel to the ground.

2. The preloading according to claim 1, characterized in that, The indicator part is an indicator rod; The first end of the indicator rod is connected to the linkage assembly, and the second end extends along the length direction parallel to the drive assembly and is supported by the support portion on the drive assembly.

3. The preloading according to claim 2, characterized in that, The support component includes a clamp and a support rod; The clamp includes two opposing rings that can enclose a snap-fit ​​space. The snap-fit ​​space can be fitted onto the end of the drive assembly away from the connecting rod assembly, and the clamp is fixed to the drive assembly by a first connector. The support rod has a fixed end and a sleeve end at its two ends along its axial direction. The fixed end of the support rod is fixedly connected to one of the retaining rings at a first preset angle, and the sleeve end is sleeved on the indicator rod.

4. The preloading according to claim 3, characterized in that, The end of the support rod away from the clamp is bent into a circular structure, which can serve as the fitting end and be fitted onto the indicator rod.

5. The preloading according to claim 4, characterized in that, The calibration section is a reflective strip; The reflective strip is affixed to the position of the indicator rod corresponding to the circular structure when the drive assembly drives the bucket parallel to the ground.

6. The preloading according to claim 4, characterized in that, The calibration section is a paint layer; The paint layer is applied to the position of the indicator bar corresponding to the circular structure when the drive assembly drives the bucket parallel to the ground.

7. The preloading according to claim 5 or 6, characterized in that, The linkage assembly includes a first link and a second link; One end of the first connecting rod is hinged to one end of the second connecting rod via a first pin; the end of the first connecting rod opposite to the second connecting rod is hinged to the bucket via a second pin; the end of the second connecting rod opposite to the first connecting rod is hinged to the drive assembly via a third pin. The first end of the indicator rod is connected to the end of the first pin through a second connector.

8. The preloading according to claim 7, characterized in that, The indicator rod includes a main body and a bendable portion that can serve as the first end; The bent portion is connected to the main body at a second preset angle at the end of the main body away from the support rod; The second connector passes through the bend and connects the bend to the end of the first pin.

9. The preloading according to claim 8, characterized in that, The second connector includes a connecting bolt, a hexagonal nut, and a lock nut; The connecting bolt is fixed to the end of the first pin by a hexagonal nut, and the locking nut is screwed onto the shank of the connecting bolt, forming a movable space between the locking nut and the head of the connecting bolt; the indicator rod is sleeved on the shank of the connecting bolt located in the movable space, and can rotate around the shank of the connecting bolt.

10. The preloading according to claim 7, characterized in that, The drive assembly includes a hydraulic cylinder and a drive arm; The output end of the hydraulic cylinder is hinged to the first pin; one end of the drive arm is hinged to the fixed end of the hydraulic cylinder via a transition plate; the other end of the drive arm is hinged to the end of the second connecting rod opposite to the first connecting rod.

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