Hydraulic cylinder and testing device therefor

Abstract

The application relates to the field of hydraulic oil cylinders, in particular to a hydraulic oil cylinder and a testing device thereof. The testing device comprises a first joint, a detection head and a on-off assembly. The first joint has an assembly end and a connecting end, the assembly end and the connecting end are integrally formed, the connecting end is used for connecting an external hose, the assembly end is provided with a first mounting hole, a second assembly cavity and an insertion hole, the first mounting hole and the second assembly cavity are communicated, the insertion hole is communicated with the second assembly cavity, the connecting end is provided with a first oil guide hole and is communicated with the second assembly cavity, the detection head is detachably installed at the end of the assembly end, the detection head has an insertion end and an assembly end, the insertion end is arranged in the oil hole of the connecting block, and the assembly end is arranged in the first mounting hole, and the on-off assembly is movably arranged in the second assembly cavity and is used for selectively sealing the first oil guide hole. The application can effectively utilize the structural configuration to realize the advantages of convenient operation, reliable sealing and high detection precision.

Description

Technical Field

[0001] This application relates to the field of hydraulic cylinders, and more specifically to a hydraulic cylinder and a testing device thereof. Background Technology

[0002] Hydraulic cylinders, as actuators that convert hydraulic energy into mechanical energy, are widely used in engineering machinery, agricultural equipment, ships, and vehicles. Especially in vehicle rear axle steering systems, hydraulic cylinders drive the wheel hubs on both sides through the linear reciprocating motion of the piston rod, achieving precise adjustment of the tire steering angle, which directly affects the vehicle's handling stability, ride comfort, and active safety performance. These hydraulic cylinders typically consist of core components such as a housing, guide sleeve, piston rod, piston element, and a connecting block welded to the outer wall of the housing. The housing has an assembly cavity for hydraulic oil flow, and flow holes are formed on the housing surface. Corresponding oil holes are provided on the connecting block and communicate with the flow holes. External hydraulic lines deliver high-pressure hydraulic fluid to the housing through the connecting block, pushing the piston element and driving the piston rod.

[0003] In the manufacturing and long-term use of this type of hydraulic cylinder, the welded joint between the connecting block and the housing is a critical weak point. The two are typically fixed together using welding, and the quality of the weld directly determines the cylinder's sealing reliability and structural strength. However, during service, the weld of a hydraulic cylinder must withstand long-term cyclic alternating hydraulic shocks, external vibration loads, and thermal stress caused by changes in ambient temperature, making the operating conditions extremely harsh. Under the combined effect of these multiple factors, the weld area is highly susceptible to latent defects such as fatigue cracks, micropores, or stress corrosion cracking. Once these defects form, high-pressure hydraulic fluid will leak from the weld joint, causing hydraulic system pressure decay, cylinder sluggish response, or even complete malfunction. More seriously, if a sudden leak occurs while the vehicle is in motion, it may trigger loss of steering control, posing a significant threat to driving safety.

[0004] Therefore, rigorous and precise testing of the fixing strength and sealing performance of the welded joint surface between the connecting block and the housing during the manufacturing and periodic maintenance of hydraulic cylinders is an indispensable process to ensure product quality and operational safety. However, the industry currently lacks specialized testing methods for such non-standard welded sealing surfaces. Traditional testing methods often employ immersion in water to visually inspect for bubbles or applying soap solution for observation. These methods have low sensitivity, are difficult to effectively identify minute leakage sources, and cannot provide any quantitative assessment of the mechanical strength of the weld. Therefore, it is necessary to develop a specialized testing device that is easy to operate, provides reliable sealing, and has high testing accuracy to meet the practical needs of rapid quality inspection on the production floor and performance verification after maintenance. Summary of the Invention

[0005] The main purpose of this application is to provide a hydraulic cylinder and its testing device, wherein the hydraulic cylinder and its testing device can effectively utilize their own structural configuration to achieve the advantages of convenient operation and the ability to check the sealing quality of welded joints.

[0006] Another objective of this application is to provide a hydraulic cylinder, wherein the hydraulic cylinder comprises: a housing having a first assembly cavity with both ends connected, and the surface of the housing also having two flow holes, both of which are connected to the first assembly cavity; two guide sleeves, the two guide sleeves being respectively installed at both ends of the housing to close the first assembly cavity, each guide sleeve having a guide hole at its center, the two guide holes being connected to the first assembly cavity; a piston rod, one end of the piston rod passing sequentially through one of the guide holes, the first assembly cavity and the other guide hole, and being placed on the outside, the other end also being placed on the outside; a first piston member, the first piston member being disposed on the piston rod and located in the first assembly cavity; and two connecting blocks, the two connecting blocks being respectively fixed to the outer wall of the housing and corresponding one-to-one with the two flow holes, each connecting block having an oil hole, the oil hole being connected to the corresponding flow hole.

[0007] Another objective of this application is to provide a testing device for a hydraulic cylinder, wherein the testing device includes: a first connector having an assembly end and a connecting end, the assembly end and the connecting end being integrally formed, the connecting end being used to connect an external hose, the assembly end having a first mounting hole, a second assembly cavity, and an insertion hole, wherein the first mounting hole and the second assembly cavity are connected, the insertion hole is connected to the second assembly cavity, the connecting end having a first oil guide hole and communicating with the second assembly cavity; and a detection head, the detection head being detachably mounted on the end of the assembly end, and the detection head having an insertion end and a mounting... The device includes an insertion end placed inside the oil hole of the connecting block and an installation end placed inside the first installation hole; and a switching component movably disposed in the second assembly cavity for selectively sealing the first oil guide hole. This solution features a specially designed detection head with an annular groove. During testing, the annular groove faces the welding joint surface between the connecting block and the housing. External oil circuit equipment precisely injects high-pressure oil into the sealing area through the switching component and the detection head, allowing for direct and centralized detection of the sealing performance and structural strength of the weld under high-pressure conditions. This effectively solves the problems of low sensitivity and inability to quantitatively assess weld strength using traditional water immersion bubble methods or soap application methods.

[0008] Another objective of this application is to provide a hydraulic cylinder and its testing device, wherein the hydraulic cylinder and its testing device have a simple structure, are easy to operate, do not involve complex manufacturing processes and expensive materials, have high economic efficiency, and are easy to promote and use.

[0009] To achieve at least one of the above-mentioned objectives, this application provides a hydraulic cylinder, wherein the hydraulic cylinder comprises: The housing has a first assembly cavity with two ends connected, and the surface of the housing also has two flow holes, both of which are connected to the first assembly cavity; Two guide sleeves are respectively installed at both ends of the housing to close the first assembly cavity. Each guide sleeve has a guide hole at its center, and the two guide holes are connected to the first assembly cavity. A piston rod, one end of which passes sequentially through one of the guide holes, the first assembly cavity, and the other guide hole and is placed on the outside, and the other end is also placed on the outside; A first piston member, disposed on the piston rod and located within the first assembly cavity; and Two connecting blocks are respectively fixed to the outer wall of the housing and correspond one-to-one with the two flow holes. Each connecting block has an oil hole, which is connected to the corresponding flow hole.

[0010] To achieve at least one of the above-mentioned objectives, this application provides a testing device for a hydraulic cylinder, wherein the testing device includes: The first connector has an assembly end and a connecting end, the assembly end and the connecting end are integrally formed, the connecting end is used to connect an external hose, the assembly end is provided with a first mounting hole, a second assembly cavity and an insertion hole, wherein the first mounting hole and the second assembly cavity are connected, the insertion hole and the second assembly cavity are connected, and the connecting end is provided with a first oil guide hole and is connected to the second assembly cavity. A detection head, detachably mounted at the end of the mounting end, having an insertion end and a mounting end, the insertion end being positioned within the oil hole of the connecting block, and the mounting end being positioned within the first mounting hole; and The on / off assembly is movably disposed within the second assembly cavity for selectively closing the first oil guide hole.

[0011] In one or more embodiments of this application, the switching component includes a movable rod and a second piston. The movable rod is fastened to the second piston, and the second piston has a rectangular structure. The second assembly cavity is a rectangular assembly cavity, and the top and bottom walls of the second assembly cavity each have a guide groove. The first oil guide hole and the first mounting hole are respectively connected to the two guide grooves. The second piston has two guide portions, and the two guide portions respectively cooperate with the two guide grooves.

[0012] In one or more embodiments of this application, the second piston member further has a second oil guide hole, the two ends of which are respectively located on the ends of the two guide portions.

[0013] In one or more embodiments of this application, a retaining ring is also installed at one end of the externally located movable rod, and the on / off assembly further includes a first elastic member, one end of which abuts against the retaining ring, and the other end of which abuts against the surface of the assembly end.

[0014] In one or more embodiments of this application, the switching component further includes a push-pull electromagnet, which is mounted on the surface of the assembly end and cooperates with the fixing block.

[0015] In one or more embodiments of this application, the mounting end of the detection head abuts against the stepped surface of the first mounting hole, and a sealing ring is further provided on the surface of the mounting end placed in the first mounting hole. The detection head also has a third oil guide hole, which is connected to the first mounting hole.

[0016] In one or more embodiments of this application, a plurality of telescopic components are further installed on the sidewall of the first mounting hole, and the surface of the mounting end has a positioning groove that mates with the plurality of telescopic components. Specifically, the telescopic component includes a second elastic member and a positioning post. The second elastic member is welded and fixed to the positioning post, and the positioning post is configured to abut against the positioning groove to define the position of the detection head.

[0017] In one or more embodiments of this application, the surface of the insertion end further has an annular groove, and the bottom wall forming the annular groove has at least one liquid outlet hole, which is connected to the third oil guide hole, that is, oil enters from the third oil guide hole and exits from the liquid outlet hole to enter the annular groove. Attached Figure Description

[0018] These and / or other aspects and advantages of this application will become clearer and more readily understood from the following detailed description of embodiments of this application taken in conjunction with the accompanying drawings, wherein: Figure 1 The figure shows a schematic diagram of a hydraulic cylinder.

[0019] Figure 2 The diagram illustrates the structure of the testing device. Figure 1 .

[0020] Figure 3 The diagram illustrates the structure of the testing device. Figure 2 .

[0021] Figure 4 The diagram shows a schematic of the end structure of the assembly end.

[0022] Figure 5 The diagram shows a schematic of the second piston component.

[0023] Figure 6 The diagram illustrates the application of the testing device.

[0024] Figure 7 Another implementation of the testing apparatus is illustrated. Detailed Implementation

[0025] The terms and words used in the following specification and claims are not limited to their literal meaning, but are used solely by the inventors to enable a clear and consistent understanding of this application. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of this application is provided for illustrative purposes only and not for the purpose of limiting the application as defined in the appended claims and their equivalents.

[0026] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0027] While ordinal numbers such as "first," "second," etc., will be used to describe various components, this does not limit which components are used. The term is used only to distinguish one component from another. For example, a first component may be referred to as a second component, and similarly, a second component may be referred to as a first component, without departing from the teachings of the inventive concept. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] The terminology used herein is for the purpose of describing various embodiments only and is not intended to be limiting. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will also be understood that the terms “comprising” and / or “having” as used in this specification specify the presence of the described features, numbers, steps, operations, components, elements or combinations thereof, without excluding the presence or addition of one or more other features, numbers, steps, operations, components, elements or groups thereof.

[0029] refer to Figures 1 to 7 According to a preferred embodiment of the present invention, a hydraulic cylinder and its testing device are described, wherein the structure of the hydraulic cylinder and its testing device is as follows: Figure 1 and 2 As shown, the structure of the hydraulic cylinder is as follows: Figure 1As shown, it is used on the rear axle of a vehicle to adjust tire orientation via a hydraulic cylinder. Specifically, the hydraulic cylinder includes a housing 10 with a first assembly cavity 101 connected at both ends. The hydraulic cylinder also includes two guide sleeves 20, which are mounted at both ends of the housing 10 to close the first assembly cavity 101. Specifically, each guide sleeve 20 has a guide hole at its center, and both guide holes communicate with the first assembly cavity 101. The hydraulic cylinder also includes a piston rod 30 and a first piston member disposed on the piston rod 30. One end of the piston rod 30 passes sequentially through one of the guide holes, the first assembly cavity 101, and the other guide hole, and is positioned externally. The other end is also positioned externally. The first piston member is located within the first assembly cavity 101, and both ends of the piston rod 30 are configured to engage with two external wheel hubs. It should be noted that the surface of the housing 10 also has two flow holes 102, both of which are connected to the first assembly cavity 101. The first piston is located between the two flow holes 102. Furthermore, the hydraulic cylinder includes two connecting blocks 50, which are fixed to the outer wall of the housing 10. Each connecting block 50 corresponds to one of the two flow holes 102. Each connecting block 50 also has an oil hole 501, which is connected to the corresponding flow hole 102. The connection between the connecting block 50 and the surface of the housing 10 is achieved by welding to define the position of the connecting block 50. Additionally, this application provides a testing device, which is mainly used to test the fixing strength and sealing performance between the connecting block 50 and the housing 10 to ensure that oil does not leak from between the connecting block 50 and the housing 10.

[0030] Specifically, the structure of the detection device is as follows: Figure 2-3 As shown, it includes a first connector 60, which has an assembly end 61 and a connecting end 62. The assembly end 61 and the connecting end 62 are integrally formed, and the connecting end 62 is configured to connect to an external hose. The external hose 200 is connected to an external oil circuit device 300, meaning that external oil enters the first connector 60 through the external hose. It should be noted that the detection device includes a detection head 70, which is detachably disposed at the end of the first connector 60 away from the external hose, specifically mounted on the end of the assembly end 61. The structure of the assembly end 61 is as follows... Figure 2As shown, the assembly end 61 has a first mounting hole 611 at the end opposite to the connecting end 62, and a second assembly cavity 612 on one side and an insertion hole 613 on the other side. Both the first mounting hole 611 and the insertion hole 613 are connected to the second assembly cavity 612. The connecting end 62 has a first oil guide hole 621, which is also connected to the second assembly cavity 612, meaning that external oil can enter the second assembly cavity 612 through the first oil guide hole 621. One end of the detection head 70 is installed in the first mounting hole 611, and the other end is placed in the oil hole 501 of the connecting block 50.

[0031] It should be noted that the structure of the detection head 70 is as follows: Figure 2 As shown, it has an insertion end 71 and an installation end 72, the insertion end 71 and the installation end 72 are integrally formed, and the insertion end 71 is placed in the oil hole 501, and the installation end 72 is placed in the first installation hole 611.

[0032] It should be noted that the testing device also includes a switching component 80, which is movably disposed in the second assembly cavity 612 to selectively close the first oil guide hole 621. That is, when the first oil guide hole 621 is opened, oil can enter the detection head 70 through the switching component 80, so that the detection head 70 can also detect the sealing performance and connection reliability of the surface between the connecting block 50 and the housing 10.

[0033] Specifically, the on / off assembly 80 includes a movable rod 81 and a second piston member 82. The movable rod 81 is fastened to the second piston member 82, meaning the second piston member 82 has an assembly hole that mates with the movable rod 81. The connection between the assembly hole and the movable rod 81 is an interference fit. The second piston member 82 has a rectangular structure, and the second assembly cavity 612 is also a rectangular cavity to accommodate the second piston member 82. Specifically, the top and bottom walls of the second assembly cavity 612 each have a guide groove 6121. The first oil guide hole 621 and the first mounting hole 611 respectively connect to the two guide grooves 6121. The second piston member 82 has two guide portions 821, which mate with the two guide grooves 6121 respectively, thereby limiting the movement path of the second piston member 82. Preferably, the movable rod 81 has a structure of two assembled rods, which are fixed to the second piston member 82 from the left and right sides.

[0034] It is worth mentioning that the second piston member 82 also has a second oil guide hole 822. The two ends of the second oil guide hole 822 are respectively located on the ends of the two guide portions 821. That is, when the second piston member 82 moves laterally a predetermined distance, the second oil guide hole 822 is directly opposite the first oil guide hole 621, and the oil passage is open. Conversely, when the first oil guide hole 621 and the second oil guide hole 822 are misaligned, the oil passage is disconnected.

[0035] It should be noted that a retaining ring 811 is also installed at one end of the externally positioned movable rod 81, and the on / off assembly 80 also includes a first elastic element 83. One end of the first elastic element 83 abuts against the retaining ring 811, and the other end abuts against the surface of the assembly end 61. That is, when the movable rod 81 moves away from the first elastic element 83, the oil passage is opened, and the first elastic element 83 is compressed. Additionally, a fixing block 812 is installed at the end of the movable rod 81 away from the retaining ring 811. The on / off assembly 80 also includes a push-pull electromagnet 90, which is mounted on the surface of the assembly end 61 and cooperates with the fixing block 812. It should be understood by those skilled in the art that the push-pull electromagnet 90 has a telescopic rod 91, which cooperates with the fixing block 812. When the push-pull electromagnet 90 is in operation, the telescopic rod 91 retracts to drive the fixing block 812 to move toward the push-pull electromagnet 90, thereby causing the movable rod 81 to move synchronously. At this time, the oil circuit is open. Conversely, the movable rod 81 is reset by the first elastic element 83.

[0036] It should be noted that the first mounting hole 611 is a stepped hole, and the mounting end 72 of the detection head 70 abuts against the stepped surface of the first mounting hole 611. A sealing ring 74 is also provided on the surface of the mounting end 72 placed in the first mounting hole 611 to ensure the sealing performance. The detection head 70 also has a third oil guide hole 73, which is connected to the first mounting hole 611, that is, oil enters the third oil guide hole 73 through the first mounting hole 611. It should also be noted that the connection between the mounting end 72 and the first mounting hole 611 is a detachable connection. Multiple telescopic components 100 are also installed on the side wall of the first mounting hole 611, and the surface of the mounting end 72 has a positioning groove 721 that cooperates with the multiple telescopic components 100. Specifically, the telescopic component 100 includes a second elastic member and a positioning post. The second elastic member is welded and fixed to the positioning post, and the positioning post is configured to abut against the positioning groove 721 to limit the position of the detection head 70.

[0037] Specifically, the surface of the insertion end 71 also has an annular groove 711, and the bottom wall forming the annular groove 711 has at least one outlet hole 7111. The outlet hole 7111 is connected to the third oil guide hole 73, that is, oil enters from the third oil guide hole 73 and exits from the outlet hole 7111 to enter the annular groove 711. It is worth mentioning that the end of the insertion end 71 is threaded to connect the insertion end 71 to the aforementioned flow hole 102. At the same time, a sealing ring 75 is installed above the annular groove 711 to ensure the sealing of the annular groove 711, so that when the external oil circuit equipment is pressurized, the oil will not leak from the assembly gap. In addition, the annular groove 711 is directly opposite the connecting block 50 and connected to the housing 10 to test the strength and sealing of the connection.

[0038] It should also be noted that the aforementioned guide portion can be fitted with a rubber sleeve 100, and the position of the rubber sleeve 100 can be defined by wrapping iron wire. The rubber sleeve ensures a tight seal between the guide portion and the first oil guide hole. Furthermore, this application also provides implementations with different connectors, such as... Figure 7 The oil injection connector shown can be used to check the sealing performance of the hydraulic cylinder end by injecting oil into the hydraulic cylinder.

[0039] It is worth mentioning that, in the embodiments of this application, the hydraulic cylinder and its testing device have a simple structure, do not involve complex manufacturing processes or expensive materials, and are highly economical. At the same time, for manufacturers, the hydraulic cylinder and its testing device provided in this application are easy to produce and inexpensive, which is more conducive to controlling production costs and further facilitates product promotion and use.

[0040] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from these principles.

Claims

1. A hydraulic cylinder, characterized in that, The hydraulic cylinder includes: The housing has a first assembly cavity with two ends connected, and the surface of the housing also has two flow holes, both of which are connected to the first assembly cavity; Two guide sleeves are respectively installed at both ends of the housing to close the first assembly cavity. Each guide sleeve has a guide hole at its center, and the two guide holes are connected to the first assembly cavity. A piston rod, one end of which passes sequentially through one of the guide holes, the first assembly cavity, and the other guide hole and is placed on the outside, and the other end is also placed on the outside; A first piston member, disposed on the piston rod and located within the first assembly cavity; and Two connecting blocks are respectively fixed to the outer wall of the housing and correspond one-to-one with the two flow holes. Each connecting block has an oil hole, which is connected to the corresponding flow hole.

2. A testing device for detecting the hydraulic cylinder of claim 1, characterized in that, The testing apparatus includes: The first connector has an assembly end and a connecting end, the assembly end and the connecting end are integrally formed, the connecting end is used to connect an external hose, the assembly end is provided with a first mounting hole, a second assembly cavity and an insertion hole, wherein the first mounting hole and the second assembly cavity are connected, the insertion hole and the second assembly cavity are connected, and the connecting end is provided with a first oil guide hole and is connected to the second assembly cavity. A detection head, detachably mounted at the end of the mounting end, having an insertion end and a mounting end, the insertion end being positioned within the oil hole of the connecting block, and the mounting end being positioned within the first mounting hole; and The on / off assembly is movably disposed within the second assembly cavity for selectively closing the first oil guide hole.

3. The testing device according to claim 2, wherein the switching component includes a movable rod and a second piston, the movable rod being fastened to the second piston, the second piston being implemented as a rectangular structure, and the second assembly cavity being a rectangular assembly cavity, the top wall and bottom wall of the second assembly cavity both having a guide groove, the first oil guide hole and the first mounting hole respectively communicating with the two guide grooves, wherein the second piston has two guide portions, the two guide portions respectively cooperating with the two guide grooves.

4. The testing device according to claim 3, wherein the second piston further comprises a second oil guide hole, the two ends of the second oil guide hole being located at the ends of the two guide portions respectively.

5. The testing device according to claim 4, wherein a retaining ring is further installed at one end of the externally positioned movable rod, and the on / off assembly further includes a first elastic member, one end of the first elastic member abutting against the retaining ring, and the other end abutting against the surface of the assembly end.

6. The testing apparatus according to claim 5, wherein the switching component further includes a push-pull electromagnet, the push-pull electromagnet being mounted on the surface of the assembly end and cooperating with the fixing block.

7. The testing device according to claim 6, wherein the mounting end of the detection head abuts against the stepped surface of the first mounting hole, and a sealing ring is further provided on the surface of the mounting end placed in the first mounting hole, and the detection head further has a third oil guide hole, the third oil guide hole being connected to the first mounting hole.

8. The testing apparatus according to claim 7, wherein a plurality of telescopic components are further installed on the side wall of the first mounting hole, and the surface of the mounting end has a positioning groove that cooperates with the plurality of telescopic components. Specifically, the telescopic component includes a second elastic element and a positioning post, the second elastic element is welded and fixed to the positioning post, and the positioning post is configured to abut against the positioning groove to define the position of the detection head.

9. The testing device according to claim 8, wherein the surface of the insertion end further has an annular groove, and the bottom wall forming the annular groove has at least one liquid outlet hole, the liquid outlet hole being connected to the third oil guide hole, that is, oil enters from the third oil guide hole and exits from the liquid outlet hole to enter the annular groove.

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