Stroke measuring device

Abstract

A supporting structure is connected with a cylinder body of a hydraulic cylinder, the supporting structure is provided with a guide hole, a guide piece is inserted into the guide hole and can reciprocate in the axial direction of the guide hole, and the guide piece is provided with a connecting part which extends out of the guide hole and is used for being connected with a piston rod. The guide piece is matched with the guide hole to guide and limit the piston rod, and the piston rod deviation possibility is reduced. The guiding piece is further connected with a moving piece in the measuring assembly, the moving piece moves along with the guiding piece, the guiding piece correspondingly converts the displacement of the piston rod to the moving piece, a measuring piece in the measuring assembly is matched with the moving piece and used for measuring the displacement of the moving piece, the displacement of the moving piece is measured, and the displacement of the piston rod of the hydraulic cylinder is obtained through displacement feedback of the moving piece. The displacement or interference of the piston rod is reduced, the stroke accuracy of the hydraulic cylinder obtained through final measurement is effectively improved, and the technical problem that the stroke measurement accuracy of the hydraulic cylinder is affected is solved to a certain extent.

Description

Technical Field

[0001] The present application belongs to the technical field of travel measuring devices, and in particular, relates to a travel measuring device. Background Art

[0002] Hydraulic cylinders are commonly used travel drive components in production sites. During the working process of hydraulic cylinders, it is usually necessary to limit the stroke of the hydraulic cylinders in order to understand and grasp the displacement and real-time position of the lifting or opening and closing of the executed components. The stroke of the piston rod of the hydraulic cylinder relative to the cylinder body is often measured using a stroke measuring device.

[0003] At present, when a stroke measuring device measures the stroke of a hydraulic cylinder, there is a possibility that the piston rod is offset during movement or that the internal components of the measuring device are offset relative to the hydraulic cylinder, resulting in inaccurate measured stroke of the hydraulic cylinder, affecting the accuracy of the stroke measurement of the hydraulic cylinder. Summary of the invention

[0004] The present application aims to at least to some extent solve the technical problem that the stroke measurement accuracy of the hydraulic cylinder is affected. To this end, the present application provides a stroke measurement device.

[0005] The present application provides a stroke measuring device for measuring the stroke of a piston rod of a hydraulic cylinder, comprising:

[0006] A supporting structure, used to be connected to the cylinder body of the hydraulic cylinder and provided with a guide hole;

[0007] A guide member, inserted into the guide hole and reciprocatingly movable along the axial direction of the guide hole, the guide member being provided with a connecting portion extending from the guide hole, the connecting portion being used to be connected to the piston rod;

[0008] The measuring component is provided with a moving part connected to the guide part and reciprocatingly movable relative to the supporting structure along the axial direction of the guide hole, and a measuring part for measuring the displacement of the moving part.

[0009] In some or certain embodiments, the guide member further comprises:

[0010] The rod part is loosely matched with the guide hole, and one end of the rod part extends out of the guide hole and is connected with the connecting part, and the connecting part is connected with the peripheral wall of the rod part.

[0011] In some or certain embodiments, the guide hole is a through hole, and the guide member is provided with a matching portion located in the guide hole and used for connecting with the moving member.

[0012] In some or certain embodiments, the travel measurement device further comprises:

[0013] a fixed pulley, arranged on the supporting structure;

[0014] A movable pulley, provided on the movable member;

[0015] A pull rope has one end as a fixed end and the other end connected to the guide member. The middle portion of the pull rope passes around the movable pulley and the fixed pulley, and the movable member is connected to the guide member via the movable pulley and the pull rope.

[0016] In some or certain embodiments, the travel measurement device further comprises:

[0017] An adjusting wheel is arranged on the supporting structure and is spaced apart from the fixed pulley, and the adjusting wheel is connected to the fixed end.

[0018] In some or certain embodiments, the support structure is further provided with a slide groove which is parallel to the guide hole and whose length direction extends along the axial direction of the guide hole, and the moving member comprises:

[0019] A sliding portion, disposed on the slide groove so as to be reciprocatable along the length direction of the slide groove;

[0020] The rack part is connected to the sliding part and protrudes from the sliding part. The measuring member is an encoder and is provided with a gear meshing with the rack part for transmission.

[0021] In some or certain embodiments, the travel measurement device further comprises:

[0022] The resetting member extends in a telescopic direction along the length direction of the slide slot and is provided with two ends acting on the sliding portion and the supporting structure respectively.

[0023] In some or certain embodiments, the travel measurement device further comprises:

[0024] The sensor is arranged on the supporting structure and is used for measuring the position of the moving part.

[0025] In some or certain embodiments, the travel measurement device further comprises:

[0026] A connecting piece is arranged on the supporting structure so as to be reciprocatable along the axial direction of the guide hole, and the connecting piece is used to be connected with the cylinder body.

[0027] In some or certain embodiments, the stroke measuring device includes at least two connecting members, and the at least two connecting members are spaced apart along the axial direction of the guide hole, and are both reciprocably movably disposed on the supporting structure along the axial direction of the guide hole.

[0028] Advantageous effects provided by one or more embodiments of the present application:

[0029] When it is necessary to measure the stroke of the piston rod of the hydraulic cylinder, the supporting structure in the stroke measuring device can be connected to the cylinder body of the hydraulic cylinder, so as to play a connecting and supporting role for the cylinder body of the hydraulic cylinder. The supporting structure is provided with a guide hole, and the guide member is inserted into the guide hole and can reciprocate along the axial direction of the guide hole. The guide member is provided with a connecting portion extending from the guide hole and used to be connected to the piston rod. The guide hole can play a reference role, so that the guide member inserted into the guide hole can reciprocate along the axial direction of the guide hole. The guide member is connected to the piston rod of the hydraulic cylinder, so that during measurement, the axial direction of the piston rod can be extended along the axial direction of the guide hole. When the piston rod is extended and retracted relative to the cylinder body, the guide rod is driven to move axially along the guide hole. The cooperation between the guide member and the guide hole can play a guiding and limiting role for the piston rod, thereby reducing the possible deviation of the piston rod during the movement and ensuring the position accuracy of the piston rod during the movement. The guide member is also connected to the moving member in the measuring assembly. The moving member can be driven by the guide member to move back and forth along the axial direction of the guide hole. The guide member converts the displacement of the piston rod to the moving member accordingly. The measuring member in the measuring assembly cooperates with the moving member and is used to measure the displacement of the moving member, which can measure the displacement of the moving member. The movement of the piston rod and the moving member will be limited by the movement of the guide member and the guide hole, which can ensure the accuracy of the displacement of the moving member finally measured by the measuring member, and then the stroke or displacement of the piston rod of the hydraulic cylinder is obtained through the displacement feedback of the moving member, which reduces the offset or interference that may occur to the piston rod during the movement process, effectively improves the accuracy of the stroke of the hydraulic cylinder finally measured, and to a certain extent solves the technical problem that the accuracy of the stroke measurement of the hydraulic cylinder is affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic structural diagram of a stroke measuring device in some embodiments or certain embodiments of the present application is shown.

[0032] Figure 2 A cross-sectional view of a stroke measuring device in some embodiments or certain embodiments of the present application is shown.

[0033] Figure 3 A side view of a stroke measuring device in some embodiments or certain embodiments of the present application is shown.

[0034] Explanation of the accompanying drawings: 1. supporting structure; 101. guide hole; 102. slide groove; 103. limiting part; 104. mounting tube; 105. supporting tube; 106. bracket; 2. guide member; 201. connecting part; 202. rod part; 2021. rod-shaped body; 2022. annular protrusion; 203. matching part; 3. measuring component; 301. moving part; 3011. sliding part; 3012. rack part; 32. measuring part; 321. gear; 322. transmission shaft; 4. fixed pulley; 5. movable pulley; 6. pull rope; 601. fixed end; 7. adjusting wheel; 8. reset member; 9. abutment member; 10. sensor; 11. connecting member; 12. mounting bracket; 13. buffer member. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] In the related art, the stroke measuring device may include at least two displacement sensors arranged at intervals along the piston cylinder of the hydraulic cylinder, and the at least two displacement sensors measure the stroke of the moving piston cylinder, or include a pull rope with one end connected to the piston rod and the other end connected to an encoder. This stroke measuring device will be affected by the accuracy of the position movement of the piston rod of the hydraulic cylinder. If the piston rod is offset, the measured stroke of the piston cylinder is not accurate enough. There is a technical problem that the accuracy of the stroke measurement of the hydraulic cylinder is affected. The embodiment of the present application provides a stroke measuring device, which can at least solve the above technical problems to a certain extent.

[0040] The present application will be described below with reference to the accompanying drawings:

[0041] Figure 1 A schematic diagram of the structure of a travel measuring device in some embodiments or certain embodiments of the present application is shown, Figure 2 A cross-sectional view of a travel measuring device in some embodiments or certain embodiments of the present application is shown, with reference to Figure 1 , 2 The present application provides a stroke measuring device for measuring the stroke of a piston rod of a hydraulic cylinder, comprising:

[0042] The support structure 1 is used to be connected to the cylinder body of the hydraulic cylinder and is provided with a guide hole 101 .

[0043] The guide member 2 is inserted into the guide hole 101 and can reciprocate along the axial direction of the guide hole 101. The guide member 2 is provided with a connecting portion 201 extending from the guide hole 101, and the connecting portion 201 is used to connect with the piston rod.

[0044] The measuring component 3 is provided with a moving member 301 connected to the guide member 2 and reciprocatingly movable relative to the supporting structure 1 along the axial direction of the guide hole 101 , and a measuring member 32 for measuring the displacement of the moving member 301 .

[0045] When it is necessary to measure the stroke of the piston rod of the hydraulic cylinder, the support structure 1 in the stroke measuring device can be connected to the cylinder body of the hydraulic cylinder to play a connecting and supporting role for the cylinder body of the hydraulic cylinder. The support structure 1 is provided with a guide hole 101, and the guide member 2 is inserted into the guide hole 101 and can reciprocate along the axial direction of the guide hole 101. The guide member 2 is provided with a connecting portion 201 extending from the guide hole 101 and used to be connected to the piston rod. The guide hole 101 can play a reference role, so that the guide member 2 inserted into the guide hole 101 can reciprocate along the axial direction of the guide hole 101. The guide member 2 is connected to the piston rod of the hydraulic cylinder, so that the axial direction of the piston rod can be extended along the axial direction of the guide hole 101 during measurement. When the piston rod is extended and retracted relative to the cylinder body, the guide rod is driven to move axially along the guide hole 101. The cooperation between the guide member 2 and the guide hole 101 can play a guiding and limiting role for the piston rod, reduce the possible deviation of the piston rod during the movement, and ensure the position accuracy of the piston rod during the movement. The guide member 2 is also connected to the moving member 301 in the measuring component 3. The moving member 301 can be driven by the guide member 2 to move back and forth along the axial direction of the guide hole 101. The guide member 2 converts the displacement of the piston rod to the moving member 301 accordingly. The measuring member 32 in the measuring component 3 cooperates with the moving member 301 and is used to measure the displacement of the moving member 301, and can measure the displacement of the moving member 301. The movement of the piston rod and the moving member 301 will be limited by the movement of the guide member 2 and the guide hole 101, which can ensure the accuracy of the displacement of the moving member 301 finally measured by the measuring member 32. The stroke or displacement of the piston rod of the hydraulic cylinder is obtained through the displacement feedback of the moving member 301, which reduces the offset or interference that may occur to the piston rod during the movement process, effectively improves the accuracy of the stroke of the hydraulic cylinder finally measured, and to a certain extent solves the technical problem that the accuracy of the stroke measurement of the hydraulic cylinder is affected.

[0046] In some or certain embodiments, the guide member 2 further comprises:

[0047] The rod portion 202 is loosely matched with the guide hole 101 , and one end of the rod portion 202 extends out of the guide hole 101 to be connected to the connecting portion 201 . The connecting portion 201 is connected to the peripheral wall of the rod portion 202 .

[0048] The rod portion 202 of the guide member 2 is loosely matched with the guide hole 101, and one end of the rod portion 202 extends out of the guide hole 101 and is connected to the connecting portion 201. The connecting portion 201 is connected to the peripheral wall of the rod portion 202, so as to facilitate the axial reciprocating movement of the guide member 2 along the guide hole 101. Moreover, this hole-axis matching method can also achieve a better guiding effect, which is beneficial to reduce the deviation of the piston rod of the hydraulic cylinder during movement.

[0049] In some or certain embodiments, the rod portion 202 may include a rod-shaped body 2021 and an annular protrusion 2022 circumferentially fixed to the rod-shaped body 2021, the outer peripheral wall of the annular protrusion 2022 is clearance-matched with the guide hole 101, one end of the rod-shaped body 2021 extends out of the guide hole 101 and the peripheral wall is connected to the connecting portion 201, and at the end of the guide hole 101 where the rod-shaped body 2021 extends out, the support structure 1 is provided with a guide ring coaxial with the guide hole 101, and the guide ring is clearance-matched with the rod-shaped body 2021. The cooperation between the rod 202 and the supporting structure 1 adopts the cooperation method in this section. The friction between the rod 202 and the guide hole 101 is small, and the cooperation between the annular protrusion 2022 and the guide hole 101, and the cooperation between the guide ring and the rod-shaped body 2021 provide two supports for the rod 202, which can ensure the stable axial movement of the rod 202 along the guide hole 101, and ensure that the rod 202 can effectively guide and support the piston rod.

[0050] In some or certain embodiments, the guide hole 101 may also be a through hole, and the guide member 2 may also be a rod-shaped structure that is clearance-matched with the guide hole 101 as a whole, so as to achieve effective guidance and position limiting of the piston rod.

[0051] In some or certain embodiments, the guide hole 101 is a through hole, and the guide member 2 is provided with a matching portion 203 located in the guide hole 101 and used for connecting with the moving member 301 .

[0052] The guide hole 101 is a through hole, and the guide member 2 is provided with a matching portion 203 located in the guide hole 101 and used to connect with the moving member 301. Then the connecting portion 201 and the matching portion 203 of the guide member 2 are respectively located inside and outside the guide hole 101, and the moving member 301 can be connected with the matching portion 203 by a structure such as a pull rope 6, or extend into the guide hole 101 to connect with the matching portion 203. This structure can make the moving member 301 and the piston rod position staggered, which is convenient for the connection and installation of the piston rod and the moving member 301. In some or certain embodiments, the matching portion 203 can be an end of the rod-shaped body 2021 away from the connecting portion 201.

[0053] In some or certain embodiments, the travel measurement device further comprises:

[0054] The fixed pulley 4 is arranged on the supporting structure 1 .

[0055] The movable pulley 5 is arranged on the moving member 301 .

[0056] The pull rope 6 has one end as a fixed end 601 and the other end connected to the guide member 2. The middle part of the pull rope 6 passes around the movable pulley 5 and the fixed pulley 4. The moving member 301 is connected to the guide member 2 via the movable pulley 5 and the pull rope 6.

[0057] In the stroke measuring device, the fixed pulley 4 is arranged on the supporting structure 1, the movable pulley 5 is arranged on the movable part 301, and the middle part of the pull rope 6 passes around the movable pulley 5 and the fixed pulley 4, one end of the pull rope 6 is the fixed end 601, and the other end is connected to the guide part 2, and the movable part 301 cooperates with the guide part 2 through the pull rope 6 and the movable pulley 5. When the guide part 2 moves with the piston rod, the guide part 2 can drive the pull rope 6 to move, and the pull rope 6 passes around the fixed pulley 4 and transmits the force to the movable pulley 5, pushing the movable pulley 5, so that the movable part 301 where the movable pulley 5 is located can move. The fixed pulley 4, the movable pulley 5 and the pull rope 6 can form a pulley group, and the large stroke of the piston rod can be converted into a small stroke movement of the moving part 301 through the pull rope 6 and the movable pulley 5. There is no need to set the size of the moving part 301 too large. When the moving part 301 moves within a smaller range, it can also realize the stroke measurement of hydraulic cylinders of larger scale or stroke, thereby reducing the preparation cost and improving the applicability to hydraulic cylinders of different scales.

[0058] In some or certain embodiments, the moving member 301 may also be a U-shaped member or a rack-shaped member. If the moving member 301 is a U-shaped member, one side of the moving member 301 may extend into the guide hole 101 and connect with the guide member 2. The movement of the guide member 2 may drive the moving member 301 to move. The measuring member 32 in the corresponding measuring assembly 3 may be a displacement sensor 10, etc. The rack-shaped moving member 301 may also be connected to the portion of the guide member 2 extending out of the guide hole 101. The displacement of the moving member 301 can be measured, and the moving member 301 may establish a certain displacement conversion relationship with the piston rod through the guide member 2.

[0059] In some or certain embodiments, the travel measurement device further comprises:

[0060] The adjusting wheel 7 is disposed on the supporting structure 1 and is spaced apart from the fixed pulley 4 . The adjusting wheel 7 is connected to the fixed end 601 .

[0061] The adjusting wheel 7 can be connected to the fixed end 601 of the pull rope 6, and play a role in fixing and positioning the fixed end 601 of the pull rope 6. Part of the adjusting wheel 7 can also play a role in adjusting the tension of the pull rope 6. When the adjusting wheel 7 plays a role in adjusting the tension of the pull rope 6, the adjusting wheel 7 can include a wheel frame fixed to the support structure 1, and a roller rotatably connected to the wheel frame, the roller can rotate relative to the wheel frame at several limited angles, the fixed end 601 can be connected to the roller, and when the roller rotates a limited angle, the tension of the pull rope 6 can be changed.

[0062] In some or certain embodiments, the fixed end 601 of the pull rope 6 may also be fixed to the support structure 1, and the stroke measuring device may also include at least two fixed pulleys 4 spaced apart on the support structure 1, and the pull rope 6 may sequentially pass around the movable pulley 5 and the at least two fixed pulleys 4. The number of fixed pulleys 4 in the stroke measuring device may be adjusted according to the position of the moving member 301.

[0063] Figure 3 A side view of a travel measuring device in some embodiments or certain embodiments of the present application is shown, with reference to Figure 3 In some or certain embodiments, the support structure 1 is further provided with a slide groove 102 which is parallel to the guide hole 101 and whose length direction extends along the axial direction of the guide hole 101. The moving member 301 includes:

[0064] The sliding portion 3011 is disposed in the slide groove 102 so as to be reciprocatable along the length direction of the slide groove 102 .

[0065] The rack portion 3012 is connected to the sliding portion 3011 and protrudes from the sliding portion 3011 . The measuring member 32 is an encoder and is provided with a gear 321 meshing with the rack portion 3012 for transmission.

[0066] The sliding part 3011 of the moving member 301 cooperates with the slide groove 102 on the supporting structure 1. The length direction of the slide groove 102 extends along the axial direction of the guide hole 101 and is parallel to the guide hole 101. The slide groove 102 can also play a guiding and limiting role for the moving member 301, so that the guide member 2 and the moving member 301 can both move back and forth in the axial direction of the guide hole 101, improve the accuracy of the moving position of the guide member 2 and the moving member 301, reduce the possible offset, and help improve the final measured stroke or displacement accuracy of the piston rod. The measuring member 32 is an encoder that meshes with the rack part 3012 through the gear 321. The movement of the moving member 301 will push the rack part 3012 to move. The rack part 3012 meshes with the gear 321 for transmission. The encoder determines the displacement of the moving member 301 according to the number of turns of the gear 321.

[0067] In some or certain embodiments, the travel measurement device further comprises:

[0068] The resetting member 8 extends in the length direction of the slide slot 102 and is provided with two ends acting on the sliding portion 3011 and the supporting structure 1 respectively. The resetting member 8 can reset the moving member 301. After the moving member 301 moves with the guide member 2, the moving member 301 is reset by the resetting member 8, which is convenient for the next measurement and improves the measurement efficiency.

[0069] In some or certain embodiments, the stroke measuring device further includes an abutment member 9 located at one end of the slide slot 102 and threadedly connected to the support structure 1, and the reset member 8 may be a spring, and the two ends of the spring respectively abut against the abutment member 9 and the moving member 301, so as to facilitate the installation of the reset member 8. The reset member 8 may also be an elastic ring, etc.

[0070] In some or certain embodiments, the support structure 1 may be provided with a limit portion 103 at the other end of the closed slide groove 102 in the length direction, and the limit portion 103 and the abutment member 9 are respectively located on both sides of the sliding portion 3011 in the length direction, and the stroke measuring device may further include a buffer member 13 disposed on the limit portion 103 and close to the moving member 301. When the sliding portion 3011 slides along the slide groove 102, the limit portion 103 can limit the moving member 301, and cooperate with the buffer member 13 to achieve an anti-collision effect, thereby extending the service life of the stroke measuring device.

[0071] In some or certain embodiments, the support structure 1 may include a mounting tube 104, a supporting tube 105 and a bracket 106, wherein the mounting tube 104 and the supporting tube 105 are connected and fixed and one end is flush, and the bracket 106 is fixedly connected to one end of the mounting tube 104 and the supporting tube 105 that is flush, and is opposite to the holes of the mounting tube 104 and the supporting tube 105. The inner hole of the mounting tube 104 forms a guide hole 101, and the guide member 2 is arranged in the guide hole 101 and extends out of the end of the mounting tube 104 away from the bracket 106, and the fixed pulley 4 and the adjustment wheel 7 can be arranged at intervals in the bracket 106 and face the guide hole 101. One side of the supporting tube 105 is provided with an opening extending along its own axial direction and connected to the inner hole of the supporting tube 105, and the opening and the inner hole of the supporting tube 105 form a slide groove 102, and the sliding portion 3011 of the moving member 301 can move along the length direction of the slide groove 102 (i.e., the axial direction of the guide hole 101), and the rack portion 3012 protrudes from the slide groove 102. The encoder can be connected to the support structure 1 through a mounting frame 12 and other structures, and the transmission shaft 322 of the encoder is coaxially connected to the gear 321, and the gear 321 is meshed with the rack part 3012. The buffer 13 and the reset member 8 are located on both sides of the sliding part 3011 in the length direction of the slide groove 102. The structure is simple, the space occupied is small, and the overall integration is high.

[0072] In some or certain embodiments, the abutting member 9 and the limiting portion 103 are both disposed on the supporting tube 105 .

[0073] In some or certain embodiments, the support structure 1 may also be configured to be a regular or irregular shape according to the application environment.

[0074] In some or certain embodiments, the travel measurement device further comprises:

[0075] The sensor 10 is disposed on the supporting structure 1 and is used to measure the position of the moving part 301 .

[0076] The sensor 10 connected to the supporting structure 1 can monitor the position of the moving part 301 to a certain extent.

[0077] In some or certain embodiments, the sensor 10 may also be connected to the support structure 1 through a structure such as a mounting frame 12, and the sensor 10 may be a proximity switch or a rangefinder. The stroke measuring device may also include at least two proximity switches spaced apart along the axial direction of the guide hole 101, and each proximity switch may measure the position of the moving part 301. The setting of at least two proximity switches may monitor the stroke of the piston rod within a certain interval, or the two proximity switches may also set the initial position and the limit position of the moving part 301 relative to the support structure 1. The proximity switch may be connected to a controller or an automation system to improve the automation of the stroke measurement of the hydraulic cylinder.

[0078] In some or certain embodiments, the travel measurement device further comprises:

[0079] The connecting member 11 is provided on the supporting structure 1 so as to be reciprocatable along the axial direction of the guide hole 101 , and the connecting member 11 is used for connecting with the cylinder body.

[0080] The connecting member 11 can facilitate the connection and fixation of the cylinder body. The connecting member 11 is reciprocatably arranged on the supporting structure 1 along the axial direction of the guide hole 101. The position of the connecting member 11 can be changed to adapt to hydraulic cylinders of different sizes, thereby improving the versatility of the stroke measuring device.

[0081] In some or certain embodiments, the stroke measuring device includes at least two connecting members 11, which are spaced apart along the axial direction of the guide hole 101 and are both reciprocatably disposed on the supporting structure 1 along the axial direction of the guide hole 101, thereby improving the connection and support effect of the cylinder body of the hydraulic cylinder.

[0082] In some or certain embodiments, the connecting member 11 may be block-shaped, and a guide groove for the connecting member 11 to move may be provided on the supporting structure 1, and the length direction of the guide groove extends along the axial direction of the guide hole 101. The connection between the connecting member 11 and the cylinder body may be a detachable connection. The connecting portion 201 of the guide member 2 may be plate-shaped or block-shaped, and the connection between the connecting portion 201 and the piston rod may also be a detachable connection.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0084] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0085] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A travel measuring device, characterized in that: Used to measure the stroke of the piston rod of the hydraulic cylinder, including: A supporting structure, used to be connected to the cylinder body of the hydraulic cylinder and provided with a guide hole; A guide member, inserted into the guide hole and reciprocatingly movable along the axial direction of the guide hole, the guide member being provided with a connecting portion extending from the guide hole, the connecting portion being used to be connected to the piston rod; The measuring component is provided with a moving part connected to the guide part and reciprocatingly movable relative to the supporting structure along the axial direction of the guide hole, and a measuring part for measuring the displacement of the moving part.

2. The travel measuring device according to claim 1, characterized in that: The guide member also includes: The rod part is loosely matched with the guide hole, and one end of the rod part extends out of the guide hole and is connected with the connecting part, and the connecting part is connected with the peripheral wall of the rod part.

3. The travel measuring device according to claim 1, characterized in that: The guide hole is a through hole, and the guide member is provided with a matching portion located in the guide hole and used for connecting with the moving member.

4. The stroke measuring device according to any one of claims 1 to 3, characterized in that: The stroke measuring device also includes: A fixed pulley, arranged on the supporting structure; A movable pulley, provided on the movable member; A pull rope has one end as a fixed end and the other end connected to the guide member. The middle portion of the pull rope passes around the movable pulley and the fixed pulley, and the movable member is connected to the guide member via the movable pulley and the pull rope.

5. The travel measuring device according to claim 4, characterized in that: The stroke measuring device also includes: An adjusting wheel is arranged on the supporting structure and is spaced apart from the fixed pulley, and the adjusting wheel is connected to the fixed end.

6. The stroke measuring device according to any one of claims 1 to 3, characterized in that: The support structure is further provided with a slide groove which is parallel to the guide hole and whose length direction extends along the axial direction of the guide hole. The moving member comprises: A sliding portion, disposed on the slide groove so as to be reciprocatable along the length direction of the slide groove; The rack part is connected to the sliding part and protrudes from the sliding part. The measuring member is an encoder and is provided with a gear meshing with the rack part for transmission.

7. The travel measuring device according to claim 6, characterized in that: The stroke measuring device also includes: The resetting member extends in a telescopic direction along the length direction of the slide slot and is provided with two ends acting on the sliding portion and the supporting structure respectively.

8. The stroke measuring device according to any one of claims 1 to 3, characterized in that: The stroke measuring device also includes: The sensor is arranged on the supporting structure and is used for measuring the position of the moving part.

9. The stroke measuring device according to any one of claims 1 to 3, characterized in that: The stroke measuring device also includes: A connecting piece is arranged on the supporting structure so as to be reciprocatable along the axial direction of the guide hole, and the connecting piece is used to be connected with the cylinder body.

10. The travel measuring device according to claim 9, characterized in that The stroke measuring device comprises at least two connecting members, which are spaced apart along the axial direction of the guide hole and are both arranged on the supporting structure so as to be reciprocatable along the axial direction of the guide hole.

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