Stop structure

Abstract

The utility model belongs to the technical field of piston and piston rod connection, and particularly relates to a stop structure which is used for locking a large-diameter piston and a piston rod, the piston is arranged on the outer side of the piston rod in a sleeving mode and is in threaded connection with the piston rod, a mounting hole is formed in the piston, and a fixed table top is arranged on the surface of the piston rod. The stop structure comprises a stop plate, the stop plate is arranged on the fixed table top in a clamping and sleeving mode and abuts against one end of the piston, a plurality of positioning holes formed in the stop plate in the circumferential direction at intervals are formed in the stop plate, and the piston and the stop plate are rotationally positioned so that the positioning holes can correspond to the mounting holes; and the first fixing piece can be inserted into the mounting hole and the positioning hole when the mounting hole corresponds to the positioning hole, so that the piston is fixedly connected with the stop plate. According to the scheme, the connection reliability between the piston and the piston rod can be improved.

Description

Technical Field

[0001] The present application belongs to the technical field of connection between piston and piston rod, and specifically relates to a stop structure. Background Art

[0002] Currently, pistons and rods are typically connected using a threaded connection. During threading, the piston and rod threads start at different positions, leading to misalignment between the positioning holes in the stopper and the mounting holes in the piston. This results in a failure to effectively maintain the stability of the piston and rod. Utility Model Content

[0003] The purpose of the present application is to solve the problem in the prior art that the positioning hole on the stop structure does not correspond to the mounting hole on the piston due to the different starting positions of the threads on the threaded piston and the piston rod.

[0004] The present application provides a stop structure for locking a large-diameter piston and a piston rod. The piston is sleeved on the outside of the piston rod and is threadedly connected to the piston rod. The piston is provided with a mounting hole, and the surface of the piston rod is provided with a fixed table. The stop structure includes:

[0005] a stop plate, which is clamped and sleeved on the fixed table and abuts against one end of the piston, wherein the stop plate is provided with a plurality of positioning holes spaced apart in the circumferential direction of the stop plate, and the piston is rotated and positioned between the stop plate so that the positioning holes correspond to the mounting holes;

[0006] A first fixing member can be inserted into the mounting hole and the positioning hole when the mounting hole corresponds to the positioning hole, so as to fix the piston and the stop plate.

[0007] In an exemplary embodiment of the present application, the piston can rotate at an angle α to be positioned and docked with the stop plate, and the value range of the angle α is: 30°≤α≤60°.

[0008] In an exemplary embodiment of the present application, the angle α is 45°.

[0009] In an exemplary embodiment of the present application, the stop plate is provided with a first positioning hole, a second positioning hole, a third positioning hole and a fourth positioning hole;

[0010] The angle formed by the first positioning hole and the second positioning hole is 45°;

[0011] The angle formed by the second positioning hole and the third positioning hole is 45°;

[0012] The angle formed by the first positioning hole and the fourth positioning hole is 90°;

[0013] The included angle formed by the fourth positioning hole and the third positioning hole is 180°.

[0014] In an exemplary embodiment of the present application, a first threaded hole is provided on the piston, and the first threaded hole is spaced apart from the mounting hole;

[0015] The stop plate is further provided with a second threaded hole, and the second threaded hole is spaced apart from the positioning hole;

[0016] The stopping structure further includes a second fixing member, which can be inserted into the second threaded hole and the first threaded hole when the mounting hole is positioned and connected with the positioning hole, so as to fix the piston and the stopping plate.

[0017] In an exemplary embodiment of the present application, the piston is provided with a plurality of first threaded holes spaced apart in the circumferential direction of the piston;

[0018] The stop plate is provided with a plurality of second threaded holes, and the plurality of second threaded holes are arranged at intervals in a circumferential direction of the stop plate.

[0019] In an exemplary embodiment of the present application, the second threaded holes and the positioning holes are spaced apart in the circumferential direction of the stop plate, and the positioning holes are provided between adjacent second threaded holes;

[0020] The included angle formed by adjacent second threaded holes is 45°.

[0021] In an exemplary embodiment of the present application, the piston rod is provided with a first threaded section and a positioning surface, and the positioning surface is a step-shaped structure;

[0022] The piston is provided with a second threaded section and a positioning portion, the second threaded section is threadedly connected to the first threaded section, and the positioning portion is clamped at the positioning table.

[0023] In an exemplary embodiment of the present application, the fixing table, the positioning table and the first threaded section are arranged sequentially in the axial direction of the piston rod, and the fixing table is a step-shaped structure.

[0024] In an exemplary embodiment of the present application, the first fixing member is a positioning pin.

[0025] The stop structure of the present application has at least the following beneficial effects:

[0026] The stop structure of the present application includes a stop plate and a first fixing member. The stop plate is clipped onto a fixed surface on the surface of the piston rod and abuts against one end of the piston to limit the axial displacement of the piston rod. The stop plate is provided with a plurality of positioning holes spaced apart along its circumference. The piston and the stop plate are rotationally positioned, i.e., the piston can be rotated a certain angle to be positioned relative to the stop plate. After the piston and the stop plate are positioned, the first fixing member is inserted into the mounting hole and the positioning hole. In other words, the present solution positions the piston and the stop plate by rotating them, thereby eliminating the problem of matching the piston rod and the piston caused by different starting positions of thread processing. The positioning hole and the mounting hole are aligned with each other, ensuring that the stop plate and the piston can be positioned and matched, so that the piston and the stop plate are fixedly connected, preventing movement between the piston and the piston rod, and improving the reliability of the connection between the piston and the piston rod.

[0027] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0028] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0030] Figure 1 A schematic structural diagram of a stop structure provided in an embodiment of the present application being clamped on a piston rod is shown.

[0031] Figure 2 A schematic structural diagram of the stop structure provided in an embodiment of the present application is shown, in which the stop structure is rotated 90° and clamped on the piston rod.

[0032] Figure 3 Shown Figure 1 Schematic diagram of the cross-sectional structure of A-A'.

[0033] Description of reference numerals:

[0034] 100. Piston; 110. Positioning portion; 200. Piston rod; 210. Fixing table; 211a. First protrusion; 211b. Second protrusion; 211c. Third protrusion; 211d. Fourth protrusion; 220. Positioning table; 300. Stop structure; 310. Stop plate; 311a. First groove; 311b. Second groove; 311c. Third groove; 311d. Fourth groove; 312a. First positioning hole; 312b. Second positioning hole; 312c. Third positioning hole; 312d. Fourth positioning hole; 313. Second threaded hole; 320. First fixing member; 330. Second fixing member. DETAILED DESCRIPTION

[0035] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0036] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically specified.

[0037] In this application, unless otherwise specified or limited, terms such as "assembly" and "connection" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0038] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0039] See also Figures 1 to 3As shown, the large-diameter piston 100 and the piston rod 200 are connected by threads. In order to eliminate the movement between the piston 100 and the piston rod 200, an embodiment of the present application provides a stopping structure 300, which is used to lock the large-diameter piston 100 and the piston rod 200 to prevent the piston 100 from moving on the piston rod 200.

[0040] Among them, see Figure 1 and Figure 3 As shown, the stop structure 300 includes a stop plate 310 and a first fixing member 320 . The stop plate 310 is fixedly connected to the piston 100 by the first fixing member 320 to limit the movement of the piston 100 on the piston rod 200 .

[0041] In some embodiments of this application, see Figure 1 and Figure 3 As shown, the stop plate 310 can adopt an annular block structure, which is clipped onto the fixed table 210 on the surface of the piston rod 200, and can limit the rotation of the stop plate 310 relative to the piston rod 200, thereby ensuring the connection stability between the stop plate 310 and the piston rod 200.

[0042] For example, see Figure 1 As shown, the fixing surface 210 of the piston rod 200 is provided with four protrusions extending radially along the piston rod 200, and the stop plate 310 is provided with grooves corresponding to the protrusions. After the grooves and protrusions are aligned with each other, the stop plate 310 is inserted into the fixing surface 210 of the piston rod 200 to restrict the movement of the stop plate 310 in the circumferential direction of the piston rod 200. It should be noted that the angle formed between adjacent protrusions is 90°. When the stop plate 310 is rotated 90°, the grooves on the stop plate 310 and the protrusions on the piston rod 200 can still be aligned.

[0043] In some embodiments of this application, see Figure 1 As shown, the piston 100 is provided with a mounting hole (not shown in the figure). The stop plate 310 is provided with a plurality of positioning holes spaced apart in its circumferential direction, and the positioning holes are through holes that penetrate the piston rod 200 in the axial direction.

[0044] The piston 100 and the stop plate 310 are rotationally positioned, that is, after the piston 100 rotates a certain angle, the positioning hole on the stop plate 310 corresponds to the mounting hole on the piston 100.

[0045] It should be understood that because the stop plate 310 is clipped onto the fixed surface 210 on the piston rod 200, the stop plate 310 cannot rotate relative to the piston rod 200. If the positioning hole on the stop plate 310 does not correspond to the mounting hole on the piston 100, the mounting hole and the positioning hole can be aligned by rotating the piston 100 a certain angle, thereby avoiding the need for matching threads on the piston rod 200 and piston 100, ensuring alignment between the positioning hole and the mounting hole, and reducing production costs.

[0046] In some embodiments of the present application, the first fixing member 320 is extended in the axial direction of the piston rod 200, and the first fixing member 320 can adopt a fixing structure such as a positioning pin.

[0047] It can be understood that when the mounting hole and the positioning hole correspond to each other, the first fixing member 320 can be inserted into the mounting hole and the positioning hole to fix the piston 100 and the stop plate 310 to prevent the piston 100 from displacing axially on the piston rod 200.

[0048] In addition, through the high-precision matching connection of the first fixing part 320, the movement of related parts of the piston 100 and the piston rod 200 due to the processing gap can be effectively eliminated, and the second fixing part 330 can be effectively ensured not to be sheared during large torque movement, thereby ensuring that the stopping structure 300 will not fail, thereby improving the connection reliability between the piston 100 and the piston rod 200, and the operation is simple and easy to implement.

[0049] In some embodiments of the present application, the piston 100 can be rotated by an angle α to align with the stop plate 310. The angle α is in the range of 30°≤α≤60°, and can be, for example, 30°, 45°, or 60°. The piston 100 and the stop plate 310 can be aligned by rotating the large-diameter piston 100 slightly.

[0050] It is understandable that the value range of the angle α is not limited to the above range, and can be lower than the above range or exceed the above range.

[0051] In some embodiments of the present application, the angle α can be 45°. For a large-diameter piston 100, the piston 100 only needs to be rotated 45° to complete the alignment connection between one of the multiple positioning holes and a mounting hole on the piston 100, avoiding the problem of matching processing of the piston rod 200 and the piston 100 due to different starting positions of thread processing.

[0052] In some embodiments of this application, see Figure 1 or Figure 2As shown, the stop plate 310 is provided with four positioning holes, namely a first positioning hole 312a, a second positioning hole 312b, a third positioning hole 312c, and a fourth positioning hole 312d. The first positioning hole 312a, the second positioning hole 312b, the third positioning hole 312c, and the fourth positioning hole 312d are arranged at intervals along the circumference of the stop plate 310.

[0053] Among them, see Figure 1 As shown, the angle formed by the first positioning hole 312a and the second positioning hole 312b is 45°; the angle formed by the second positioning hole 312b and the third positioning hole 312c is 45°; the angle formed by the first positioning hole 312a and the fourth positioning hole 312d is 90°; and the angle formed by the fourth positioning hole 312d and the third positioning hole 312c is 180°.

[0054] When the groove on the stop plate 310 is aligned with any one of the four protrusions on the piston rod 200 , the positions of the positioning holes can overlap with each other.

[0055] For example, see Figure 1 and Figure 2 As shown, the stop plate 310 is provided with a first groove 311a, a second groove 311b, a third groove 311c and a fourth groove 311d, and the fixed table 210 of the piston rod 200 is provided with a first protrusion 211a, a second protrusion 211b, a third protrusion 211c and a fourth protrusion 211d. When the first groove 311a, the second groove 311b, the third groove 311c and the fourth groove 311d correspond to the first protrusion 211a, the second protrusion 211b, the third protrusion 211c and the fourth protrusion 211d respectively, the first positioning hole 312a, the second positioning hole 312b, the third positioning hole 312c and the fourth positioning hole 312d are respectively located at the first position, the second position, the third position and the fourth position. After the stop plate 310 rotates 90°, the first groove 311a aligns with the second protrusion 211b, the second groove 311b aligns with the third protrusion 211c, the third groove 311c aligns with the fourth groove 311d, and the fourth groove 311d aligns with the first protrusion 211a. The first positioning hole 312a is located at the fourth position, the second positioning hole 312b is located at the fifth position, the third positioning hole 312c is located at the first position, and the fourth positioning hole 312d is located at the sixth position. At this point, the first positioning hole 312a is located at the same position as the fourth positioning hole 312d, and the third positioning hole 312c is located at the same position as the first positioning hole 312a. This ensures that no matter where the grooves in the stop plate 310 are engaged with the protrusions, one of the positioning holes will always align, ensuring proper engagement between the stop plate 310 and the piston 100.

[0056] In other embodiments of the present application, the stop plate 310 may also be provided with 8 or 12 positioning holes, with the spacing between adjacent positioning holes being 45° or 30°. It is understood that the more positioning holes there are, the smaller the rotation angle of the piston 100.

[0057] In some embodiments of the present application, a first threaded hole (not shown in the figures) is provided on the piston 100 , and the first threaded hole and the mounting hole are spaced apart from each other to avoid affecting the mounting therebetween.

[0058] In some embodiments of this application, see Figure 1 As shown, the stop plate 310 is provided with a second threaded hole 313 that passes through the piston rod 200 in the axial direction. The second threaded hole 313 is spaced apart from the positioning hole, and the second threaded hole 313 and the positioning hole avoid each other to avoid affecting the connection relationship between them.

[0059] See also Figure 1 and Figure 3 As shown, the stop structure 300 further includes a second fixing member 330, which extends in the axial direction of the piston rod 200. When the mounting hole and the positioning hole are positioned and connected, the second fixing member 330 is inserted into the second threaded hole 313 and the first threaded hole to further secure the piston 100 and the stop plate 310.

[0060] In some embodiments of the present application, the second fixing member 330 may be a high-strength screw. The high-strength screw can provide a pre-tightening force between the spiral pairs and eliminate the gap between the spiral pairs.

[0061] In some embodiments of the present application, a plurality of first threaded holes are provided on the piston 100 , and the plurality of first threaded holes are sequentially spaced apart in the circumferential direction of the piston 100 .

[0062] For the corresponding Figure 1 As shown, a plurality of second threaded holes 313 are provided on the stop plate 310 . The plurality of second threaded holes 313 are arranged at intervals on the stop plate 310 , and the second threaded holes 313 correspond to the first threaded holes.

[0063] In addition, see Figure 1 As shown, the stop structure 300 includes multiple second fixing members 330, which correspond to the second threaded holes 313 and the first threaded holes. By using multiple sets of second fixing members 330, the preload force on the piston 100 and the piston rod 200 can be further increased, eliminating thread clearance.

[0064] In some embodiments of the present application, the second threaded holes 313 and the positioning holes are spaced apart in the same circumferential direction, i.e., the second threaded holes 313 and the positioning holes are equidistant from the axis of the piston rod 200. The positioning holes are located between adjacent second threaded holes 313, with the angle formed by adjacent second threaded holes 313 being 45°. The spacing between the second threaded holes 313 and the positioning holes prevents interference between the second threaded holes 313 and the positioning holes, thereby ensuring a secure connection between the stop plate 310 and the piston 100.

[0065] In some embodiments of this application, see Figure 3 As shown, the piston rod 200 is provided with a first threaded segment (not shown) and a positioning surface 220, which is stepped. The piston 100 is provided with a second threaded segment (not shown) and a positioning portion 110, which is threadedly connected to the first threaded segment. The first threaded segment is externally threaded, and the second threaded segment is internally threaded. When the second threaded segment is threadedly connected to the first threaded segment, the positioning portion 110 engages with the positioning surface 220, preventing the piston 100 from moving axially relative to the piston rod 200.

[0066] In some embodiments of this application, see Figure 3 As shown, the fixing surface 210, the positioning surface 220, and the first threaded section are sequentially arranged axially along the piston rod 200, and the fixing surface 210 also has a stepped structure. When the stop plate 310 is fixed to one side of the piston 100, the stop plate 310 restricts the leftward movement of the piston 100, while the positioning portion 110 restricts the rightward movement of the piston 100. In other words, the positioning portion 110 and the stop plate 310 restrict the axial displacement of the piston 100 along the piston rod 200, preventing any mutual movement and ensuring a secure connection between the piston 100 and the piston rod 200.

[0067] In addition, the positioning pin and the second fixing member 330 are used between the piston 100 and the stop plate 310 to eliminate the movement between the piston 100 and the piston rod 200 due to the processing gap, and to prevent the second fixing member 330 from being sheared during large torque movement, thereby ensuring that the stop structure 300 will not fail and improving the connection reliability between the piston 100 and the piston rod 200.

[0068] The working process of the stop structure 300 of this application is as follows:

[0069] When the large piston 100 is screwed onto the piston rod 200, the stop plate 310 is installed, and the groove on the stop plate 310 is aligned with the protrusion on the fixing table 210 of the piston rod 200 to perform the positioning and assembly. By rotating the piston 100 at a certain angle, the positioning hole on the stop plate 310 is aligned with the mounting hole on the piston 100. After the positioning hole and the mounting hole are aligned, a positioning pin is inserted into the positioning hole and the mounting hole. Then, the second fixing member 330 is inserted into the second threaded hole 313 and the first threaded hole to fix the piston 100 and the stop plate 310. By using multiple sets of second fixing members 330, the piston 100 and the piston rod 200 can be pre-tightened to eliminate thread gaps.

[0070] This solution eliminates the problem of matching the piston rod 200 and piston 100 due to different thread machining starting positions. The positioning holes and mounting holes can be aligned by simply rotating them through a certain angle α. The high-precision connection of the locating pins eliminates the movement of related parts between the piston 100 and the piston rod 200 due to machining clearance. It also effectively prevents shearing of the second fixing member 330 and failure of the stop structure 300 during high-torque movement, improving the reliability of the connection between the piston 100 and the piston rod 200. The overall operation is simple and easy to implement.

[0071] In the description of this specification, the reference terms "some embodiments", "exemplarily", etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0072] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application. Therefore, any changes or modifications made in accordance with the claims and description of the present application should fall within the scope of the patent application.

Claims

1. A stop structure for locking a large diameter piston and a piston rod, characterized in that: The piston is sleeved on the outside of the piston rod and is threadedly connected to the piston rod. A mounting hole is provided on the piston, and a fixed table is provided on the surface of the piston rod. The stop structure includes: a stop plate, which is clamped and sleeved on the fixed table and abuts against one end of the piston, wherein the stop plate is provided with a plurality of positioning holes spaced apart in the circumferential direction of the stop plate, and the piston is rotated and positioned between the stop plate so that the positioning holes correspond to the mounting holes; A first fixing member can be inserted into the mounting hole and the positioning hole when the mounting hole corresponds to the positioning hole, so as to fix the piston and the stop plate.

2. The stop structure according to claim 1, characterized in that: The piston can rotate through an angle α to position and dock with the stop plate, and the value range of the angle α is: 30°≤α≤60°.

3. The stop structure according to claim 2, characterized in that: The angle α is 45°.

4. The stop structure according to claim 3, characterized in that: The stop plate is provided with a first positioning hole, a second positioning hole, a third positioning hole and a fourth positioning hole; The angle formed by the first positioning hole and the second positioning hole is 45°; The angle formed by the second positioning hole and the third positioning hole is 45°; The angle formed by the first positioning hole and the fourth positioning hole is 90°; The included angle formed by the fourth positioning hole and the third positioning hole is 180°.

5. The stop structure according to claim 1, characterized in that: The piston is provided with a first threaded hole, and the first threaded hole is spaced apart from the mounting hole; The stop plate is further provided with a second threaded hole, and the second threaded hole is spaced apart from the positioning hole; The stopping structure further includes a second fixing member, which can be inserted into the second threaded hole and the first threaded hole when the mounting hole is positioned and connected with the positioning hole, so as to fix the piston and the stopping plate.

6. The stop structure according to claim 5, characterized in that: The piston is provided with a plurality of first threaded holes spaced apart in the circumferential direction of the piston; The stop plate is provided with a plurality of second threaded holes, and the plurality of second threaded holes are arranged at intervals in a circumferential direction of the stop plate.

7. The stop structure according to claim 6, characterized in that: The second threaded holes and the positioning holes are spaced apart in the circumferential direction of the stop plate, and the positioning holes are provided between adjacent second threaded holes; The included angle formed by adjacent second threaded holes is 45°.

8. The stop structure according to claim 1, characterized in that: The piston rod is provided with a first threaded section and a positioning table, and the positioning table is a step-shaped structure; The piston is provided with a second threaded section and a positioning portion, the second threaded section is threadedly connected to the first threaded section, and the positioning portion is clamped at the positioning table.

9. The stop structure according to claim 8, characterized in that: The fixing table, the positioning table and the first threaded section are arranged in sequence in the axial direction of the piston rod, and the fixing table is a step-shaped structure.

10. The stop structure according to claim 1, characterized in that: The first fixing member is a positioning pin.

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