Piston rod threading protective sleeve device

Abstract

The invention relates to the technical field of compressor part assembly, and discloses a piston rod threading protective sleeve device. The piston rod threading protective sleeve device comprises a protective sleeve shell, a circumferential limiting piece and an axial limiting piece, wherein the protective sleeve shell is provided with two half shell bodies which are buckled with each other; the circumferential limiting piece is used for being arranged at the ends, away from the piston rod, of the two half shells in a sleeving mode, and the two half shells abut against the side, facing the piston rod, of the circumferential limiting piece. The axial limiting piece is detachably connected to the ends, away from the piston rod, of the two half shells. According to the piston rod threading protective sleeve device, the split type protective sleeve shell is adopted, the two half shell bodies are buckled to the end of the piston rod, the ends of the two half shell bodies are circumferentially limited through the circumferential limiting piece, the circumferential limiting piece is pressed through the axial limiting piece, operation is convenient, the assembly efficiency of the piston rod is greatly improved, and the piston rod threading protective sleeve device is suitable for popularization and application. And the sheath shell is prevented from being separated from the end part of the piston rod, so that the phenomenon that the sheath shell falls off when the piston rod passes through the cylinder is avoided.

Description

Technical Field

[0001] This invention relates to the field of compressor component assembly technology, and more specifically to a piston rod guide sleeve device. Background Technology

[0002] A reciprocating compressor is a large industrial device that compresses low-pressure gas into high-pressure gas for output. It typically includes components such as a cylinder, piston, piston rod, crosshead, motor, crankshaft, and connecting rod. The motor rotates the compressor's crankshaft, and the connecting rod and crosshead convert this rotational motion into the reciprocating linear motion of the piston. One end of the piston rod is threaded to the crosshead, and the other end is also threaded to the piston. Piston rings and packing are installed on the cylinder wall to create a sealed space during the piston's reciprocating motion. However, during the disassembly and installation of the piston rod, it needs to pass through the cylinder cavity, which can easily lead to contact with the packing, causing wear. Traditional piston rod protective sleeves lack a fixing device, making them prone to detachment when passing through the cylinder cavity. This can scratch the packing, exacerbate seal failure, and ultimately reduce gas compression efficiency. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, or at least partially solve the above-mentioned technical problems, the present invention provides a piston rod threading protective sleeve device.

[0004] This invention provides a piston rod guide sleeve device, comprising:

[0005] The sheath has two interlocking semi-shells, one end of which is fitted onto the end of the piston rod and threadedly connected to the end of the piston rod.

[0006] A circumferential limiting member is fitted onto the end of the two semi-shells away from the piston rod, and the two semi-shells abut against the side of the circumferential limiting member facing the piston rod; and

[0007] An axial limiting member is detachably connected to the end of the two half-shells away from the piston rod, and the axial limiting member is capable of pressing the circumferential limiting member toward the piston rod.

[0008] Optionally, the semi-shell includes a shell body for connecting to the piston rod and a connector disposed at the end of the shell body. The end of the connector has a first boss. The circumferential limiting member is sleeved on the outer periphery of the first boss and abuts against the stepped surface of the connector. The axial limiting member is detachably connected to the first boss.

[0009] Optionally, a second boss is provided on the side of the connector opposite to the first boss, and the ends of the two housing bodies are sleeved on the outer periphery of the second boss, forming a welding position at the connection between the housing body and the second boss.

[0010] Optionally, the circumferential limiting member includes a limiting sleeve fitted around the outer periphery of the two first bosses.

[0011] Optionally, the limiting sleeve includes an inner sleeve and an outer sleeve, the inner sleeve being fitted onto the outer periphery of the first boss, and the outer sleeve being fitted onto the outer periphery of the inner sleeve.

[0012] Optionally, the outer sleeve is threadedly connected to the inner sleeve.

[0013] Optionally, the inner sleeve is made of a flexible material, and the outer sleeve is made of a rigid material.

[0014] Optionally, the interior of the first boss is hollow to form an insertion hole, and the axial limiting member includes a post for insertion into the insertion hole and an end cap disposed at the end of the post.

[0015] Optionally, the inner wall of the insertion hole is provided with an internal thread, and the outer periphery of the insertion post is provided with an external thread that matches the internal thread.

[0016] Optionally, the end cap has a blind hole on its end face, and the cross-section of the blind hole is polygonal.

[0017] Optionally, the inner walls of both semi-shells are provided with positioning rings for axially limiting the end of the piston rod.

[0018] Optionally, the positioning ring has a ramp on the side facing the piston rod.

[0019] Optionally, the outer periphery of the end of the sheath, the outer periphery of the circumferential limiting member, and the outer periphery of the axial limiting member form a smoothly transitioning ramp surface.

[0020] The technical solution provided by the embodiments of the present invention has the following advantages compared with the prior art:

[0021] The piston rod insertion protective sleeve device provided by this invention adopts a split-type protective sleeve shell. In use, the two half-shells are fastened to the ends of the piston rod, and the ends of the two half-shells are circumferentially limited by circumferential limiting members. The circumferential limiting members are pressed by axial limiting members to prevent the circumferential limiting members from detaching from the ends of the half-shells. This achieves circumferential and axial limiting of the protective sleeve shell, which is convenient to operate and greatly improves the assembly efficiency of the piston rod. At the same time, it prevents the protective sleeve shell from detaching from the ends of the piston rod, thereby preventing the protective sleeve shell from falling off when the piston rod passes through the cylinder, and thus preventing scratches on the packing. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0024] Figure 1 This is a cross-sectional view of the piston rod guide sleeve device according to an embodiment of the present invention in use.

[0025] Figure 2 This is a cross-sectional view of the sheath shell according to an embodiment of the present invention;

[0026] Figure 3 This is a cross-sectional view of the connector according to an embodiment of the present invention;

[0027] Figure 4 This is a cross-sectional view of the circumferential limiting member according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the axial limiting member according to an embodiment of the present invention;

[0029] Figure 6 This is a cross-sectional view of the sheath shell according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the structure of the piston rod guide sleeve device of the present invention when connected to an external tool.

[0031] Explanation of reference numerals in the attached figures

[0032] 1. Sheath; 11. Half-shell; 111. Shell body; 112. Connector; 1121. First boss; 11211. Insertion hole; 1122. Second boss; 113. Positioning ring; 2. Circumferential limiting component; 21. Limiting sleeve; 211. Inner sleeve; 212. Outer sleeve; 3. Axial limiting component; 31. Insertion post; 32. End cap; 4. Piston rod; 5. External tool. Detailed Implementation

[0033] To better understand the above-mentioned objectives, features, and advantages of the present invention, the solutions of the present invention will be further described below. It should be noted that, unless otherwise specified, the embodiments and features of the present invention can be combined with each other.

[0034] The following description sets forth many specific details in order to provide a full understanding of the invention, but the invention may also be practiced in other ways different from those described herein; obviously, the embodiments described in the specification are only some, not all, of the embodiments of the invention.

[0035] Combination Figures 1 to 7 As shown, the piston rod guide protective sleeve device provided in the embodiment of the present invention includes a protective sleeve shell 1, a circumferential limiting member 2, and an axial limiting member 3.

[0036] The sheath 1 has two interlocking semi-shells 11. One end of each semi-shell 11 is fitted onto the end of the piston rod 4 and threadedly connected to the end of the piston rod 4. Specifically, the outer circumference of the end of the piston rod 4 is provided with a first thread, and the inner wall of the end of each semi-shell 11 connected to the piston rod 4 is provided with a second thread, which matches the first thread. The cross-section of each semi-shell 11 is semi-circular, so that the cross-section of the two semi-shells 11 after being interlocked is circular, and the interior of the sheath 1 is hollow, reducing its own weight. The circular size matches the size of the piston rod 4, so that the two semi-shells 11 can cover the outer circumference of the end of the piston rod 4 after being interlocked, or the two semi-shells 11 can be interlocked and then screwed onto the end of the piston rod 4.

[0037] The circumferential limiting member 2 is used to sleeve on the end of the two half-shells 11 away from the piston rod 4, and the two half-shells 11 abut against the side of the circumferential limiting member 2 facing the piston rod 4. Specifically, the circumferential limiting member 2 is used to sleeve on the outer periphery of the two half-shells 11 after they are engaged, and the side of the circumferential limiting member 2 facing the piston rod 4 is limited by the half-shells 11 to ensure that the circumferential limiting member 2 can be positioned at the end of the half-shell 11 away from the piston rod 4.

[0038] The axial limiting member 3 is detachably connected to the end of the two half-shells 11 away from the piston rod 4, and the axial limiting member 3 can press the circumferential limiting member 2 towards the piston rod 4. The detachable connection method between the axial limiting member 3 and the half-shell 11 is unrestricted and can be selected according to actual needs. When the axial limiting member 3 is connected to the half-shell 11, the axial limiting member 3 can press the circumferential limiting member 2, thereby limiting the position of the circumferential limiting member 2 through the cooperation between the half-shell 11 and the axial limiting member 3, ensuring that the circumferential limiting member 2 is always fitted onto the outer periphery of the end of the half-shell 11.

[0039] The piston rod insertion protective sleeve device provided by the present invention adopts a split protective sleeve shell 1. In use, the two half shells 11 are fastened to the ends of the piston rod 4, and the ends of the two half shells 11 are circumferentially limited by the circumferential limiting member 2. The circumferential limiting member 2 is pressed by the axial limiting member 3 to prevent the circumferential limiting member 2 from detaching from the ends of the half shells 11. Thus, the circumferential and axial limiting of the protective sleeve shell 1 are realized. The operation is convenient and greatly improves the assembly efficiency of the piston rod 4. At the same time, it prevents the protective sleeve shell 1 from detaching from the ends of the piston rod 4, thereby preventing the protective sleeve shell 1 from falling off when the piston rod 4 passes through the cylinder, and thus preventing scratches on the packing.

[0040] In some implementations, such as Figure 2 As shown, the semi-shell 11 includes a shell body 111 for connecting to the piston rod 4 and a connector 112 disposed at the end of the shell body 111. A first boss 1121 is formed at the end of the connector 112. A circumferential limiting member 2 is sleeved on the outer periphery of the first boss 1121 and abuts against the stepped surface of the connector 112. An axial limiting member 3 is detachably connected to the first boss 1121.

[0041] Specifically, the inner wall of the end of the housing body 111 is provided with the aforementioned second thread, so that the end of the housing body 111 can be fitted onto the outer periphery of the piston rod 4, and the housing body 111 and the piston rod 4 are threadedly engaged. The connection method between the connector 112 and the housing body 111 is not limited; for example, it can be threaded or welded, and can be designed according to actual needs. The first boss 1121 and the connector 112 are coaxially arranged, so that the circumferential limiting member 2 fitted onto the outer periphery of the first boss 1121 is coaxially arranged with the first boss 1121 and the connector 112, increasing the contact area of ​​the stepped surface of the circumferential limiting member 2 and the connector 112, and ensuring the uniformity of the contact between the stepped surface of the circumferential limiting member 2 and the connector 112, thus ensuring the stress stability of the circumferential limiting member 2. The detachable connection method between the axial limiting member 3 and the first boss 1121 is not limited; for example, it can be plugged in or threaded, and can be designed according to actual needs. The axial limiting member 3 is also coaxially arranged with the first boss 1121, and then coaxially arranged with the circumferential limiting member 2, which increases the contact area between the axial limiting member 3 and the circumferential limiting member 2, further increases the stress stability of the circumferential limiting member 2, and ensures that the circumferential limiting member 2 can be stably clamped between the axial limiting member 3 and the step surface.

[0042] In some implementations, combined Figure 2 and Figure 3 As shown, the connector 112 has a second boss 1122 on the side opposite to the first boss 1121. The ends of the two housing bodies 111 are fitted around the outer periphery of the second boss 1122, and a welding position is formed at the connection between the housing body 111 and the second boss 1122.

[0043] Specifically, the second protrusion 1122 is coaxially arranged with the connector 112, and the diameter of the second protrusion 1122 matches the inner diameter of the two housing bodies 111 after they are engaged, so that the two housing bodies 111 can be fitted onto the outer periphery of the second protrusion 1122. Furthermore, as... Figure 2 As shown, the outer diameters of the two housing bodies 111 after fastening are consistent with the outer diameter of the connector 112, so that the outer circumferences of the housing bodies 111 and the outer circumferences of the connector 112 form a smooth surface, increasing the welding effect. At the same time, the welded connector and housing bodies 111 are machined and polished, specifically by wire cutting to ensure that the working cavity is not scratched when passing through the cylinder. In this design, the connector 112 is welded to the housing body 111 to increase the connection strength. Both the connector 112 and the housing body 111 adopt a split structure, that is, one half of the connector 112 is welded to the end of one housing body 111, and the other half of the connector 112 is welded to the end of the other housing body 111.

[0044] In some implementations, combined Figure 1 and Figure 4 As shown, the circumferential limiting member 2 includes a limiting sleeve 21 sleeved on the outer periphery of the two first protrusions 1121.

[0045] Specifically, the axial length of the limiting sleeve 21 matches the axial length of the first boss 1121. In use, the limiting sleeve 21 can be fitted onto the outer periphery of the two first bosses 1121, increasing the convenience of operation. Furthermore, the axial length of the limiting sleeve 21 fitted onto the two first bosses 1121 is the same as the axial length of the first bosses 1121, preventing the end of the limiting sleeve 21 away from the piston rod 4 from protruding from the end of the first boss 1121. This facilitates the subsequent installation of the axial limiting member 3 and the positioning of the limiting sleeve 21 by the axial limiting member 3.

[0046] The limiting sleeve 21 and the first boss 1121 can be connected by a sleeve or by a threaded connection. These are not restrictive and can be selected according to actual needs.

[0047] In some implementations, such as Figure 4 As shown, the limiting sleeve 21 includes an inner sleeve 211 and an outer sleeve 212. The inner sleeve 211 is used to fit around the outer periphery of the first boss 1121, and the outer sleeve 212 is used to fit around the outer periphery of the inner sleeve 211.

[0048] In this design, the limiting sleeve 21 adopts a split structure design so that the outer sleeve 212 is a consumable part that comes into contact with the external structure. When the limiting sleeve 21 needs to be replaced, only the outer sleeve 212 needs to be replaced, thus saving equipment costs.

[0049] The inner sleeve 211 and the first boss 1121 can be connected by a sleeve or by a threaded connection. These are not restrictive and can be selected according to actual needs.

[0050] In some embodiments, the limiting sleeve 21 is shaped like a frustum, and the taper of the frustum is 100°-120°, so that the outer periphery of the limiting sleeve 21 forms a sloping surface, which serves as a guide for passing through the cylinder cavity and increases the convenience and smoothness of cylinder passage.

[0051] In some embodiments, the outer sleeve 212 and the inner sleeve 211 are threaded together. In use, the inner sleeve 211 can be first fitted onto the outer circumference of the first boss 1121, and then the outer sleeve 212 can be screwed onto the outer circumference of the inner sleeve 211; or the outer sleeve 212 can be first screwed onto the outer circumference of the inner sleeve 211, and then the assembled limiting sleeve 21 can be fitted onto the outer circumference of the first boss 1121. The choice can be made according to actual needs. This design increases the ease of assembling and disassembling the outer sleeve 212 and the inner sleeve 211, while also increasing the robustness of the connection between them.

[0052] In other embodiments, the outer sleeve 212 and the inner sleeve 211 are plugged together. In use, the inner sleeve 211 can be first fitted onto the outer periphery of the first boss 1121, and then the outer sleeve 212 can be fitted onto the outer periphery of the inner sleeve 211; or the outer sleeve 212 can be first fitted onto the outer periphery of the inner sleeve 211, and then the assembled limiting sleeve 21 can be fitted onto the outer periphery of the first boss 1121. The choice can be made according to actual needs. This design also increases the ease of assembling and disassembling the outer sleeve 212 and the inner sleeve 211.

[0053] In some embodiments, the inner sleeve 211 is made of a flexible material, while the outer sleeve 212 is made of a rigid material, meaning the rigidity of the outer sleeve 212 is greater than that of the inner sleeve 211. In this design, the flexible material of the inner sleeve 211 increases the tightness of the connection between the inner sleeve 211 and the first boss 1121, preventing the inner sleeve 211 from detaching from the first boss 1121. The rigid material of the outer sleeve 212 is used for contact with external structures; due to its inherent strength, the outer sleeve 212 effectively reduces wear and increases its service life.

[0054] In some embodiments, the outer sleeve 212 can be made of a plastic or metal material with high hardness, and the inner sleeve 211 can be made of rubber or silicone, etc., and can be designed according to actual needs.

[0055] In some implementations, combined Figures 1 to 3 As shown, the hollow interior of the first boss 1121 forms an insertion hole 11211, as... Figure 5As shown, the axial limiting member 3 includes a post 31 for insertion into the insertion hole 11211 and an end cap 32 disposed at the end of the post 31.

[0056] Specifically, such as Figure 3 As shown, the socket 11211 can pass through the connector 112, increasing the convenience of opening the socket 11211 while reducing the weight of the connector 112 itself. Figure 5 As shown, the axial limiting member 3 includes an end cap 32 and a pin 31 disposed on one side of the end cap 32. The end cap 32 and the pin 31 are coaxially arranged. The pin 31 can be inserted into the insertion hole 11211, and the depth of the insertion hole 11211 can accommodate the entire pin 31. This ensures that after the pin 31 is inserted into the insertion hole 11211, the end cap 32 can abut against the end of the first boss 1121, thereby limiting the side of the limiting sleeve 21 away from the piston rod 4.

[0057] In some embodiments, the insertion post 31 is a smooth columnar structure. In this case, the insertion post 31 is inserted into the socket 11211, which increases the convenience of disassembly and assembly. At the same time, it should be ensured that the insertion post 31 and the socket 11211 are interference fit to avoid the phenomenon of the insertion post 31 disengaging from the socket 11211.

[0058] In other embodiments, the inner wall of the insertion hole 11211 is provided with internal threads, and the outer periphery of the insertion post 31 is provided with external threads that match the internal threads. In this case, the insertion post 31 and the insertion hole 11211 are threadedly engaged, which increases the convenience of disassembly and assembly, and at the same time increases the firmness of the connection between the insertion post 31 and the insertion hole 11211, preventing the insertion post 31 from detaching from the insertion hole 11211. Furthermore, by screwing the insertion post 31, the end cap 32 can be tightly attached to the end of the first boss 1121, ensuring the limiting effect of the end cap 32 on the side of the limiting sleeve 21 away from the piston rod 4.

[0059] In some implementations, such as Figure 7 As shown, the end cap 32 has a blind hole on its end face, and the cross-section of the blind hole is polygonal.

[0060] Specifically, the end cap 32 has a blind hole on the side opposite to the insertion hole 11211. The cross-section of the blind hole is polygonal, so that the blind hole can be inserted and mated with the external tool 5, thereby increasing the convenience of operation by screwing the end cap 32 with the external tool 5. The blind hole can be a hexagonal blind hole, and the corresponding external tool 5 can be a hexagonal wrench.

[0061] It is understandable that the side of the end cap 32 facing away from the insertion hole 11211 may not have a hole. In this case, the insertion post 31 can be screwed in or out by manually twisting the end cap 32.

[0062] In some implementations, such as Figure 6As shown, the inner walls of both semi-shells 11 are provided with positioning rings 113 for axially limiting the end of the piston rod 4.

[0063] Specifically, the second threads on the two half-shells 11 are provided on the side of the positioning ring 113 facing the piston rod 4. The positioning ring 113 can be integrally formed with the half-shells 11. The positioning ring 113 is used to position the end position of the piston rod 4, increasing the convenience of connection between the half-shells 11 and the piston rod 4 and the accuracy of positioning.

[0064] In some embodiments, the positioning ring 113 has a ramp on the side facing the piston rod 4.

[0065] In this design, the ramp surface can guide the positioning of the end of the piston rod 4. Specifically, after the end of the piston rod 4 contacts the ramp surface, it can slide down to the side of the positioning ring 113, increasing the positioning effect and convenience of the piston rod 4.

[0066] In some implementations, such as Figure 1 As shown, the outer periphery of the end of the sheath 1, the outer periphery of the circumferential limiting member 2, and the outer periphery of the axial limiting member 3 form a smoothly transitioning ramp surface. This design ensures that the surfaces at the connection points of the outer periphery of the end of the sheath 1, the outer periphery of the circumferential limiting member 2, and the outer periphery of the axial limiting member 3 are flush, and the outer surface of the piston rod insertion protective sleeve device is smooth, preventing damage to the external structure. Simultaneously, the ramp surface design facilitates the piston rod insertion protective sleeve device, allowing the piston rod 4 to pass through the cylinder cavity, increasing the ease of piston rod 4 reconfiguration.

[0067] Specifically, the surfaces of the connecting parts of the sheath 1, the limiting sleeve 21, and the end cap 32 are flush and smooth. The outer periphery of the connector 112 is sloped, and the diameter of the end of the connector 112 furthest from the housing body 111 is smaller than the diameter of the end of the connector 112 closest to the connector body. The limiting sleeve 21 is frustum-shaped with a taper of 100°-120°, creating a slope on its outer periphery. The slope of this slope matches that of the connector 112, ensuring a smooth transition between the connector 112 and the limiting sleeve 21. The outer periphery of the end cap 32 has an arc-shaped surface that adapts to the slope of the limiting sleeve 21, achieving a smooth transition between the limiting sleeve 21 and the end cap 32.

[0068] The installation steps of the piston rod guide sleeve device in one embodiment of the present invention are as follows:

[0069] Step S1: Weld the connector onto the housing body 111, and then perform machining and polishing. Specifically, use wire cutting to split the parts to obtain a split sheath 1.

[0070] Step S2: Screw the inner sleeve 211 onto the outer circumference of the first boss 1121 via a threaded connection, and then screw the outer sleeve 212 onto the outer circumference of the inner sleeve 211 via a threaded connection.

[0071] Step S3: Screw the insert 31 into the first boss 1121 by means of threaded connection until the end cap 32 abuts against the end face of the limiting sleeve 21 composed of the inner sleeve 211 and the outer sleeve 212, and complete the assembly of the piston rod insertion protective sleeve device.

[0072] Step S4: Screw the threaded end of the piston rod 4 into the piston rod threading protective sleeve device to complete the threading operation of the piston rod 4.

[0073] Step S5: When disassembling, insert one end of the hexagonal wrench into the hexagonal blind hole of the end cap 32, rotate the end cap 32 to disengage the insert 31 from the insert hole 11211, and then disassemble the outer sleeve 212 and the inner sleeve 211 in sequence. The split-type protective shell 1 can be separated under the action of external force, and thus disengage from the piston rod 4, which is convenient to operate.

[0074] The piston rod insertion protective sleeve device of the present invention uses a limiting sleeve 21 to circumferentially limit the sheath shell 1, and then uses an insert 31 and an end cap 32 to axially limit the limiting sleeve 21, thereby achieving circumferential and axial limiting of the sheath shell 1 and preventing it from falling off. Simultaneously, the end cap 32 has a hexagonal blind hole, allowing for assembly or disassembly with the assistance of a hexagonal wrench, thus overcoming the problem of insufficient operating space in the working chamber. Furthermore, the inner sleeve 211 and outer sleeve 212, assembled to form a truncated cone with a conical surface, further enhance the stability of the piston rod insertion protective sleeve device connection, preventing detachment during insertion and facilitating disassembly. This significantly improves the assembly efficiency of the piston rod 4 and avoids the problem of the piston rod insertion protective sleeve device falling off and scratching the packing. Moreover, the replacement method of this piston rod insertion protective sleeve device is simple, convenient, and quick, increasing work efficiency.

[0075] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0076] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A piston rod threading protective sleeve device, characterized in that, include: The sheath (1) has two interlocking half-shells (11), one end of which is used to be fitted onto the end of the piston rod (4) and threadedly connected to the end of the piston rod (4). A circumferential limiting member (2) is used to be sleeved on the end of the two half-shells (11) away from the piston rod (4), and the two half-shells (11) abut against the side of the circumferential limiting member (2) facing the piston rod (4). as well as An axial limiting member (3) is detachably connected to one end of the two half-shells (11) away from the piston rod (4), and the axial limiting member (3) is capable of pressing the circumferential limiting member (2) toward the piston rod (4).

2. The piston rod guide sleeve device according to claim 1, characterized in that, The semi-shell (11) includes a shell body (111) for connecting to the piston rod (4) and a connector (112) disposed at the end of the shell body (111). The end of the connector (112) is formed with a first boss (1121). The circumferential limiting member (2) is sleeved on the outer periphery of the first boss (1121), and the circumferential limiting member (2) abuts against the stepped surface of the connector (112). The axial limiting member (3) is detachably connected to the first boss (1121).

3. The piston rod guide sleeve device according to claim 2, characterized in that, The connector (112) has a second boss (1122) on the side opposite to the first boss (1121). The ends of the two housing bodies (111) are sleeved on the outer periphery of the second boss (1122), and a welding position is formed at the connection between the housing body (111) and the second boss (1122).

4. The piston rod guide sleeve device according to claim 2, characterized in that, The circumferential limiting member (2) includes a limiting sleeve (21) sleeved on the outer periphery of the two first bosses (1121).

5. The piston rod guide sleeve device according to claim 4, characterized in that, The limiting sleeve (21) includes an inner sleeve (211) and an outer sleeve (212). The inner sleeve (211) is used to fit around the outer periphery of the first boss (1121), and the outer sleeve (212) is used to fit around the outer periphery of the inner sleeve (211).

6. The piston rod guide sleeve device according to claim 5, characterized in that, The outer sleeve (212) is threadedly connected to the inner sleeve (211).

7. The piston rod guide sleeve device according to claim 5, characterized in that, The inner sleeve (211) is made of a flexible material, and the outer sleeve (212) is made of a rigid material.

8. The piston rod guide sleeve device according to claim 2, characterized in that, The first boss (1121) has a hollow interior forming an insertion hole (11211), and the axial limiting member (3) includes a post (31) for insertion into the insertion hole (11211) and an end cap (32) disposed at the end of the post (31).

9. The piston rod guide sleeve device according to claim 8, characterized in that, The inner wall of the insertion hole (11211) is provided with an internal thread, and the outer periphery of the insertion post (31) is provided with an external thread that matches the internal thread.

10. The piston rod guide sleeve device according to claim 9, characterized in that, The end cap (32) has a blind hole on its end face, and the cross-section of the blind hole is polygonal.

11. The piston rod guide sleeve device according to claim 1, characterized in that, The inner walls of both semi-shells (11) are provided with positioning rings (113) for axially limiting the end of the piston rod (4).

12. The piston rod guide sleeve device according to claim 11, characterized in that, The positioning ring (113) has a sloping surface on the side facing the piston rod (4).

13. The piston rod guide sleeve device according to any one of claims 1 to 12, characterized in that, The outer periphery of the end of the sheath (1), the outer periphery of the circumferential limiting member (2) and the outer periphery of the axial limiting member (3) form a smoothly transitioning slope surface.

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