A clamping hydraulic cylinder for oil valve detection

Abstract

A clamping hydraulic cylinder for oil valve detection is characterized in that it consists of a cylinder body, a push rod, a piston, a hard plastic layer, a partition layer, a sealing ring, a conical ring surface, an elastic interlayer, a large cylinder oil inlet, a large cylinder oil outlet, a small cylinder oil inlet, a small cylinder oil outlet, a large cylinder oil inlet control valve, a large cylinder oil outlet control valve, a small cylinder oil inlet control valve and a small cylinder oil outlet control valve. The present invention redesigns the hydraulic cylinder without changing the original clamping, and ensures that the push rod is not stuck by adding a deflected part; a hard plastic layer is added to the edge of the piston and engraved with patterns to ensure good sealing effects of the large and small cylinders; through online monitoring of the large and small cylinder oil inlets and outlets, the oil inlet and oil outlet speeds are adjusted in real time to ensure the smooth and consistent movement of the push rod. Although the present invention has undergone a certain degree of modification in the hydraulic cylinder structure modification, the overall effect is good and it is easy to promote and apply.

Description

Technical Field

[0001] The present invention relates to a hydraulic cylinder, in particular to a special hydraulic cylinder, specifically a clamping hydraulic cylinder for oil valve detection. The present invention mainly takes into account that the clamping mechanism for oil valve detection generally adopts three hydraulic cylinders to realize clamping and loosening synchronously, and requires that the clamping process must be smooth, otherwise it is easy to cause the valve of the casting to break or have micro cracks due to excessive local force, resulting in the production of valve waste. Therefore, the present invention is designed to ensure the smooth contraction, smooth extension and contraction of the push rod, so as to ensure the stable operation of the hydraulic cylinder. Although the internal structure of this design has a certain degree of complexity, it has well solved the problem of the push rod being stuck and the extension and retraction being difficult, and ensures that the hydraulic cylinder can work stably in a safe environment. Background Art

[0002] Before using various valve bodies, the sealing and pressure resistance of the valve bodies must be tested, which inevitably requires the valve bodies to be fixed on a fixed structure for relevant testing. The traditional method is to fix the valve in a certain position through a hydraulic system for testing, but this test often results in the three hydraulic cylinders used for valve clamping being out of sync, resulting in inconsistent clamping and loosening times, and ultimately leading to stress concentration at the edge of the valve body, microcracks in local areas of the edge of the valve body, and ultimately causing the valve body to become scrapped, causing economic losses to the enterprise. Based on the above situation, the present invention redesigns the hydraulic cylinder without changing the original clamping, and ensures that the push rod is not stuck by adding a deflected part; adds a hard plastic layer to the edge of the piston, and engraves a pattern to ensure that the sealing effect of the large and small cylinders is good; through online monitoring of the oil inlet and outlet of the large and small cylinders, the oil inlet and outlet speeds are adjusted in real time to ensure the smooth and consistent movement of the push rod. Although the present invention has undergone a certain degree of transformation in the structural transformation of the hydraulic cylinder, the overall effect is good and it is easy to promote and apply. Summary of the invention

[0003] The purpose of the present invention is to design a clamping hydraulic cylinder for oil valve detection that can ensure the smooth contraction, smooth extension and contraction of the push rod, and ensure the smooth operation of the oil valve detection, in view of the fact that the clamping mechanism for oil valve detection generally adopts three hydraulic cylinders to realize the clamping and loosening synchronously, and the clamping process must be smooth, otherwise the valve of the casting is prone to rupture or micro cracks due to excessive local force, resulting in the problem of valve rejection.

[0004] The technical solution of the present invention is:

[0005] A clamping hydraulic cylinder for oil valve detection comprises a cylinder body 1, a push rod 2 and a piston 3. The piston 3 is mounted on the cylinder body 1 and connected to the push rod 2. The invention is characterized in that: a partition layer 5 is arranged in the rod cavity of the cylinder body 1, a through hole for the push rod 2 to pass through is arranged in the center of the partition layer 5, a conical ring surface 7 is arranged in the cylinder body 1 outside the partition layer 5, an elastic interlayer 8 is arranged on the conical ring surface 7, and a conical through hole is formed when the elastic interlayer 8 is squeezed to ensure the centering and smooth entry and exit of the push rod 2; the outer ring of the piston 3 is provided with a hard plastic layer 4 that can increase the sealing performance, and the protruding end of the push rod 2 is in a frustum structure; the rodless cavity of the cylinder body 1 is connected with A large cylinder oil inlet 9 and a large cylinder oil outlet 10, the large cylinder oil inlet 9 is provided with a large cylinder oil inlet control valve 13, the large cylinder oil outlet 10 is provided with a large cylinder oil outlet control valve 14; the rod chamber of the cylinder body 1 is connected with a small cylinder oil inlet 11 and a small cylinder oil outlet 12, the small cylinder oil inlet 11 is provided with a small cylinder oil inlet control valve 15, the small cylinder oil outlet 12 is provided with a small cylinder oil outlet control valve 16; by controlling the opening degree of the large cylinder oil inlet control valve 13, the large cylinder oil outlet control valve 14, the small cylinder oil inlet control valve 15 and the small cylinder oil outlet control valve 16 and working, the oil inlet and oil outlet pressures can be controlled, thereby controlling the working state of the push rod.

[0006] The cone angle of the conical annular surface 7 is 1-5°.

[0007] A sealing ring 6 is installed in the central through hole of the isolation layer 5 .

[0008] The surface of the hard plastic layer 4 that contacts the inner surface of the cylinder body 1 is engraved with patterns that can improve the sealing performance.

[0009] The large cylinder oil outlet 10 is located on one side of the large cylinder oil inlet 9 , and the small cylinder oil outlet 12 is located on one side of the small cylinder oil inlet 11 .

[0010] When oil flows into the large cylinder oil inlet 9, the large cylinder oil outlet 10 is closed, the small cylinder oil outlet 12 is opened, and the small cylinder oil inlet 11 is closed, the push rod 2 extends outward to clamp the valve; when the large cylinder oil inlet 9 is closed, the large cylinder oil outlet 10 is opened, the small cylinder oil outlet 12 is closed, and oil flows into the small cylinder oil inlet, the push rod 2 contracts inward to release the clamped valve.

[0011] The front end of the push rod 2 is made into a conical surface for easy extension and retraction. At the same time, there is a taper of 1~5° on the conical annular surface 7. The purpose is to avoid the push rod 2 from having a low concentricity in the circular hole surrounded by the elastic interlayer 8 due to the deflection of the push rod 2, resulting in jamming. When the push rod 2 is deflected in the circular hole surrounded by the elastic interlayer 8, the circular hole of the elastic interlayer 8 is pressed by the push rod 2, and the circular hole of the elastic interlayer 8 compresses the spring inward and deflects 1~5°, ensuring that the push rod 2 is not stuck.

[0012] The large cylinder oil inlet control valve 13 and the small cylinder oil outlet control valve 16, and the large cylinder oil outlet control valve 14 and the small cylinder oil inlet control valve 15 are monitored online by sensors; in order to ensure the stable operation of the hydraulic cylinder during clamping and loosening, when the hydraulic cylinder is extended to clamp, the large cylinder oil inlet 9 is opened, and the small cylinder oil outlet 12 is opened at the same time, and the flow rate of the oil in each oil port is adjusted by the sensor. If the large cylinder oil inlet 9 takes in oil too fast, it is necessary to monitor and feedback to the large cylinder oil outlet 10 through the sensor and open it to drain oil at a certain flow rate to ensure the stable advancement of the push rod 2. Similarly, when the hydraulic cylinder is loosened, the small cylinder oil inlet control valve 15 needs to be opened, and the large cylinder oil outlet 10 is opened at the same time, and the flow rate of the oil in each oil port is adjusted by the sensor. If the small cylinder oil inlet 11 takes in oil too fast, it is necessary to monitor and feedback to the small cylinder oil outlet 12 through the sensor and open it to drain oil at a certain flow rate.

[0013] Beneficial effects of the present invention:

[0014] The present invention redesigns the hydraulic cylinder without changing the original clamping, and ensures that the push rod is not stuck by adding a deflected part; adds a hard plastic layer on the edge of the piston and engraves a pattern to ensure good sealing effect of the large and small cylinders; and adjusts the oil inlet and outlet speeds in real time through online monitoring of the oil inlet and outlet of the large and small cylinders to ensure the smooth and consistent movement of the push rod. Although the present invention has undergone a certain degree of modification in the structural modification of the hydraulic cylinder, the overall effect is good and it is easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] like Figure 1 shown.

[0018] A clamping hydraulic cylinder suitable for oil valve detection consists of a cylinder body 1, a push rod 2, a piston 3, a hard plastic layer 4, a partition layer 5, a sealing ring 6, a conical ring surface 7, an elastic interlayer 8, a large cylinder oil inlet 9, a large cylinder oil outlet 10, a small cylinder oil inlet 11, a small cylinder oil outlet 12, a large cylinder oil inlet control valve 13, a large cylinder oil outlet control valve 14, a small cylinder oil inlet control valve 15 and a small cylinder oil outlet control valve 16. A partition layer 5 is provided in the rod cavity of the cylinder body 1, and a through hole is provided in the center of the partition layer 5 for the push rod 2 to pass through. A conical ring surface 7 is provided in the cylinder body 1 outside the partition layer 5, and an elastic interlayer 8 is mounted on the conical ring surface 7. When the elastic interlayer 8 is squeezed, a conical through hole is formed to ensure the centering and smooth entry and exit of the push rod 2; the outer ring of the piston 3 is provided with a hard plastic layer 4 that can increase the sealing performance, and the protruding end of the push rod 2 is a frustum structure, and the cone angle can be any as long as it can ensure the free entry and exit of the push rod; the rodless cavity of the cylinder body 1 is connected to the large cylinder oil inlet 9 and the large cylinder oil outlet 10, and the large cylinder oil inlet A large cylinder oil inlet control valve 13 is installed on the port 9, and a large cylinder oil outlet control valve 14 is installed on the large cylinder oil outlet 10; the rod chamber of the cylinder body 1 is connected with the small cylinder oil inlet 11 and the small cylinder oil outlet 12, the small cylinder oil inlet control valve 15 is installed on the small cylinder oil inlet 11, and the small cylinder oil outlet control valve 16 is installed on the small cylinder oil outlet 12; by controlling the opening degree of the large cylinder oil inlet control valve 13, the large cylinder oil outlet control valve 14, the small cylinder oil inlet control valve 15 and the small cylinder oil outlet control valve 16 and working, the oil inlet and oil outlet pressures can be controlled, thereby controlling the working state of the push rod.

[0019] Details are as follows:

[0020] like Figure 1 As shown, a partition layer 5 and a hole opened thereon are bored in the cylinder body 1 of the clamping hydraulic cylinder of the present invention, a sealing ring 6 is installed on the hole, a hole with a conical ring surface 7 is opened on the right side of the partition layer 5, the conical surface has a taper of 1 to 5 degrees from the inside to the outside (in a trumpet shape from the inside to the outside), an elastic interlayer 8 (spring interlayer, rubber interlayer, etc.) is installed on the conical ring surface 7, the diameter of the circular hole surrounded by the surface of the elastic interlayer 8 is equal to the diameter of the end of the push rod 2, the front end of the push rod 2 is made into a conical surface, so that it can be smoothly extended and retracted in the circular hole surrounded by the elastic interlayer 8, the end of the push rod 2 is equipped with a piston 3, and a circle is installed at the contact part between the piston 3 and the inner surface of the cylinder body 1 A hard plastic layer 4, wherein the portion where the hard plastic layer 4 contacts the inner surface of the cylinder body 1 is engraved with patterns (which may be knurled pattern structures such as cross patterns and herringbone patterns) to ensure that the oils of the large and small cylinders are tightly sealed; a large cylinder oil inlet 9 is provided at one end of the large cylinder of the cylinder body 1, and a large cylinder oil outlet 10 is on one side of the large cylinder oil inlet 9, and a large cylinder oil inlet control valve 13 and a large cylinder oil outlet control valve 14 are respectively provided on the large cylinder oil inlet 9 and the large cylinder oil outlet 10; a small cylinder oil inlet 11 is provided at one end of the small cylinder of the cylinder body 1, and a small cylinder oil outlet 12 is on one side of the small cylinder oil inlet 11, and a small cylinder oil inlet control valve 15 and a small cylinder oil outlet control valve 16 are respectively provided on the small cylinder oil inlet 11 and the small cylinder oil outlet 12.

[0021] like Figure 1 As shown, a piston 3 is provided at the end of the push rod 2, and a hard plastic layer 4 is provided on the surface of the piston 3; a sealing ring 6 is provided in the inner hole of the partition layer 5; the push rod 2 equipped with the piston 3 and the hard plastic layer 4 is installed in the cylinder body 1, and the conical surface end of the push rod 2 is inserted into the small hole of the partition layer 5 equipped with the sealing ring 6, and is extended and retracted in the circular hole surrounded by the elastic interlayer 8 provided on the conical annular surface 7; when the oil inlet 9 of the large cylinder is filled with oil, the oil outlet 10 of the large cylinder is closed, the oil outlet 12 of the small cylinder is opened, and the oil inlet of the small cylinder is closed, the push rod 2 extends outward to clamp the valve; when the oil inlet 9 of the large cylinder is closed, the oil outlet 10 of the large cylinder is opened, the oil outlet 12 of the small cylinder is closed, and the oil inlet of the small cylinder is filled with oil, the push rod 2 contracts inward to release the clamped valve.

[0022] like Figure 1 As shown, the front end of the push rod 2 is made into a conical surface for easy extension and retraction. At the same time, the conical annular surface 7 has a taper of 1 to 5 degrees, the purpose is to avoid the push rod 2 from being stuck in the circular hole surrounded by the elastic interlayer 8 due to the deflection of the push rod 2. When the push rod 2 deflects in the circular hole surrounded by the elastic interlayer 8, the circular hole of the elastic interlayer 8 can compress the spring inward and deflect by 1 to 5 degrees to ensure that the push rod 2 is not stuck.

[0023] like Figure 1 As shown, the large cylinder oil inlet control valve 13 and the small cylinder oil outlet control valve 16 are monitored online by sensors; the large cylinder oil outlet control valve 14 and the small cylinder oil inlet control valve 15 are monitored online by sensors; at the same time, the large cylinder oil inlet control valve 13 and the large cylinder oil outlet control valve 14 are also monitored online by sensors; the small cylinder oil inlet control valve 15 and the small cylinder oil outlet control valve 16 are also monitored online by sensors. In order to ensure the stable operation of the hydraulic cylinder during clamping and loosening, when the hydraulic cylinder is extended to clamp, the oil inlet 9 of the large cylinder is opened, and the oil outlet 12 of the small cylinder is opened at the same time, and the flow rate of the oil in each oil port is adjusted by the sensor. If the oil inlet 9 of the large cylinder is too fast, it is necessary to monitor and feedback to the oil outlet 10 of the large cylinder through the sensor and open it to drain the oil at a certain flow rate to ensure the stable advancement of the push rod 2. Similarly, when the hydraulic cylinder is loosened, it is necessary to open the small cylinder oil inlet control valve 15, and the oil outlet 10 of the large cylinder is opened at the same time, and the flow rate of the oil in each oil port is adjusted by the sensor. If the oil inlet 11 of the small cylinder is too fast, it is necessary to monitor and feedback to the oil outlet 12 of the small cylinder through the sensor and open it to drain the oil at a certain flow rate.

[0024] The present invention does not involve parts that are the same as the prior art or can be implemented by using the prior art.

Claims

1. A clamping hydraulic cylinder for testing oil valves, comprising a cylinder body (1), a push rod (2), and a piston (3), wherein the piston (3) is mounted on the cylinder body (1) and connected to the push rod (2), and characterized in that: A partition layer (5) is provided in the rod cavity of the cylinder body (1), a through hole for the push rod (2) to pass through is provided at the center of the partition layer (5), a conical ring surface (7) is provided in the cylinder body (1) outside the partition layer (5), an elastic interlayer (8) is sleeved on the conical ring surface (7), and the elastic interlayer (8) forms a conical through hole when it is squeezed to ensure the centering and smooth entry and exit of the push rod (2); the outer ring of the piston (3) is provided with a hard plastic layer (4) that can increase the sealing performance, and the protruding end of the push rod (2) is in a frustum structure; the rodless cavity of the cylinder body (1) is connected to a large cylinder oil inlet (9) and a large cylinder oil outlet (10), and a large cylinder oil inlet control valve (13) and a large cylinder outlet valve (10) are installed on the large cylinder oil inlet (9). A large cylinder oil outlet control valve (14) is installed on the oil port (10); the rod chamber of the cylinder body (1) is connected to the small cylinder oil inlet (11) and the small cylinder oil outlet (12); the small cylinder oil inlet control valve (15) is installed on the small cylinder oil inlet (11); and the small cylinder oil outlet control valve (16) is installed on the small cylinder oil outlet (12); the opening of the large cylinder oil inlet control valve (13), the large cylinder oil outlet control valve (14), the small cylinder oil inlet control valve (15) and the small cylinder oil outlet control valve (16) is controlled, and the oil inlet and outlet pressures can be controlled during operation, thereby controlling the working state of the push rod; the front end of the push rod (2) is made into a conical surface for easy extension and contraction, and at the same time, there are 1 to 5 The purpose is to avoid the push rod (2) from getting stuck due to the low concentricity of the push rod (2) in the circular hole surrounded by the elastic interlayer (8); when the push rod (2) is deflected in the circular hole surrounded by the elastic interlayer (8), the push rod (2) presses the circular hole of the elastic interlayer (8), and the circular hole of the elastic interlayer (8) compresses the spring inward and deflects 1 to 5 degrees, thereby ensuring that the push rod (2) is not stuck; the large cylinder oil inlet control valve (13) and the small cylinder oil outlet control valve (16), and the large cylinder oil outlet control valve (14) and the small cylinder oil inlet control valve (15) are monitored online by sensors; in order to ensure the stable operation of the hydraulic cylinder during clamping and loosening When the hydraulic cylinder is extended and clamped, the oil inlet (9) of the large cylinder is opened, and at the same time the oil outlet (12) of the small cylinder is opened, and the flow rate of the oil in each oil port is adjusted by the sensor. If the oil inlet (9) of the large cylinder is too fast, it is necessary to monitor and feedback to the oil outlet (10) of the large cylinder and open it to drain the oil at a certain flow rate to ensure that the push rod (2) moves forward stably. Similarly, when the hydraulic cylinder is released, it is necessary to open the oil inlet control valve (15) of the small cylinder, and at the same time the oil outlet (10) of the large cylinder is opened, and the flow rate of the oil in each oil port is adjusted by the sensor. If the oil inlet (11) of the small cylinder is too fast, it is necessary to monitor and feedback to the oil outlet (12) of the small cylinder and open it to drain the oil at a certain flow rate.

2. The clamping hydraulic cylinder for oil valve detection according to claim 1 is characterized in that The cone angle of the conical annular surface (7) is 1-5°.

3. The clamping hydraulic cylinder for oil valve detection according to claim 1 is characterized in that A sealing ring (6) is installed in the central through hole of the isolation layer (5).

4. The clamping hydraulic cylinder for oil valve detection according to claim 1 is characterized in that The surface of the hard plastic layer (4) in contact with the inner surface of the cylinder body (1) is engraved with a pattern that can enhance the sealing performance.

5. The clamping hydraulic cylinder for oil valve detection according to claim 1 is characterized in that The large cylinder oil outlet (10) is located on one side of the large cylinder oil inlet (9), and the small cylinder oil outlet (12) is located on one side of the small cylinder oil inlet (11).

6. The clamping hydraulic cylinder for oil valve detection according to claim 1 is characterized in that When oil is introduced into the large cylinder oil inlet (9), the large cylinder oil outlet (10) is closed, the small cylinder oil outlet (12) is opened, and the small cylinder oil inlet (11) is closed, the push rod (2) extends outward to clamp the valve; when oil is introduced into the large cylinder oil inlet (9), the large cylinder oil outlet (10) is opened, the small cylinder oil outlet (12) is closed, and oil is introduced into the small cylinder oil inlet, the push rod (2) contracts inward to release the clamped valve.

Images