Modular single-acting oil cylinder with anti-rust cylinder sleeve

Abstract

The present application relates to the field of oil cylinder processing, in particular to a modular single-acting oil cylinder with a rust-proof cylinder sleeve, comprising a cylinder barrel in a hollow cylindrical structure and a piston assembly, a cylinder sleeve is coaxially inserted in the cylinder barrel and closely attached to the inner wall of the cylinder barrel, and the piston assembly is slidingly arranged in the cylinder sleeve, both ends of the cylinder barrel are respectively provided with a cylinder head and a cylinder cover for limiting the end of the piston assembly, the cylinder head and the cylinder cover are sealingly connected to the corresponding end of the cylinder barrel through a quick-release connector, and a locking mechanism with self-locking function is arranged in each quick-release connector for driving the cylinder head and the cylinder cover to rotate around the axis of the cylinder barrel and clamping the cylinder barrel. Firstly, the present application is provided with a cylinder sleeve slidingly connected with the piston in the cylinder barrel, which can protect the cylinder barrel when there is more water in the rod cavity; secondly, the cylinder cover and the cylinder head of the present application are connected to the cylinder barrel through quick-release connectors and locking mechanisms, which can ensure that the cylinder sleeve in the cylinder barrel can be quickly and conveniently replaced after rusting.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of oil cylinder processing, in particular to a modular single-acting oil cylinder with a rust-proof cylinder sleeve. BACKGROUND

[0002] The oil cylinder is also called hydraulic cylinder, which is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). It is simple in structure and reliable in operation. When it is used to realize reciprocating motion, the reducer can be omitted, and there is no transmission gap, so the movement is stable. Therefore, it is widely used in various hydraulic systems. The structural form of the hydraulic cylinder is various, and the classification method is also various. According to the movement mode, it can be divided into linear reciprocating type and rotary oscillating type; according to the situation of being acted on by hydraulic pressure, it can be divided into single-acting type and double-acting type. The single-acting oil cylinder is an oil cylinder that supplies pressure oil to only one side of the piston.

[0003] The traditional single-acting oil cylinder has the following disadvantages: since the single-acting oil cylinder supplies pressure oil to only one side of the piston, that is, only the no-rod cavity is full of pressure oil, and since the air pressure in the rod cavity needs to be kept constant during the movement of the piston, the rod cavity often needs to be connected to the outside through a pipeline. For example, many oil cylinders are connected to the hydraulic oil tank through a pipeline. However, the oil in the oil tank will produce water at a high temperature, and the water will enter the rod cavity through the corresponding pipeline, and the water will gradually rust the inner wall of the cylinder barrel of the rod cavity after the oil cylinder stops working. SUMMARY

[0004] Therefore, it is necessary to provide a modular single-acting oil cylinder with a rust-proof cylinder sleeve to solve the problems in the prior art.

[0005] To solve the problems in the prior art, the technical scheme adopted by the present application is as follows:

[0006] A modular single-acting oil cylinder with a rust-proof cylinder sleeve, comprising a cylinder barrel in a hollow cylindrical structure and a piston assembly, a cylinder sleeve being coaxially inserted into the cylinder barrel and tightly abutting the inner wall of the cylinder barrel, and the piston assembly being slidingly arranged in the cylinder sleeve, a cylinder head and a cylinder cover being arranged at both ends of the cylinder barrel respectively for limiting the end of the piston assembly, the cylinder head and the cylinder cover being sealingly connected to the corresponding end of the cylinder barrel through a quick release connector, and a locking mechanism with a self-locking function being arranged in each quick release connector for driving the cylinder head and the cylinder cover to rotate around the axis of the cylinder barrel and clamping the cylinder barrel.

[0007] Preferably, each quick release connector is in a circular ring structure, two groups of limiting clamping grooves being formed on the outer walls of both ends of the cylinder barrel in a symmetrical state and for connecting the corresponding quick release connectors, and a clamping piece being fixedly connected to one end of the inner wall of each quick release connector for clamping in the corresponding limiting clamping groove.

[0008] Preferably, the limiting slots are four limiting grooves distributed at equal angles around the cylinder axis, each of the limiting grooves comprises a first axial slot extending from one end of the cylinder along the axis to the other end, an arc-shaped through slot rotating at a certain angle around the cylinder axis from the first axial slot away from the one end of the cylinder, and a second axial slot extending from the arc-shaped through slot away from the one end of the cylinder along the axis to the one end of the cylinder but not protruding from the one end of the cylinder, and the clamping members comprise four limiting protrusions corresponding to the four limiting grooves respectively and welded on the inner wall of the quick release connector.

[0009] Preferably, the cylinder head is welded with four arc-shaped protrusions at equal angles along the axis and in T-shaped structure at one end close to the corresponding quick release connector, the narrow end of the arc-shaped protrusion is fixedly connected with the cylinder head, and the end of the corresponding quick release connector away from the other quick release connector is provided with four clamping grooves at equal angles along the axis and corresponding to the four arc-shaped protrusions respectively, one end of each of the clamping grooves is an insertion groove for the axial insertion of the corresponding arc-shaped protrusion, and the other end of the clamping groove is an anti-extrusion groove for the rotation of the arc-shaped protrusion around the cylinder axis and preventing the arc-shaped protrusion from extruding out of the quick release connector, the wider end of the arc-shaped protrusion is in a structure with one side higher than the other side on the side close to the cylinder head, and the side close to the insertion groove is higher, and the connection mode of the cylinder head and the corresponding quick release connector is consistent with the connection mode of the cylinder head and the corresponding quick release connector.

[0010] Preferably, each of the locking mechanisms comprises:

[0011] A fixed box is inserted into the side wall of the quick release connector corresponding to one of the arc-shaped protrusions;

[0012] An axial worm is arranged in the fixed box and parallel to the axis of the corresponding quick release connector, and an arc-shaped rack for cooperating with the worm is fixedly connected to the corresponding arc-shaped protrusion, and the end of the corresponding clamping groove in the quick release connector close to the other quick release connector is also provided with an avoiding through slot for the rotation of the corresponding arc-shaped rack;

[0013] A drive worm is arranged in the fixed box and engaged with the axial worm.

[0014] Preferably, the fixed box comprises:

[0015] Two first plates in symmetrical state, the axial worm is arranged between the two first plates through a shaft, the two sides of the two first plates are fixedly connected through two second plates in symmetrical state, and the two ends of the drive worm are respectively arranged in the corresponding second plates through shafts;

[0016] The connecting shell is arranged at one end of the two first plates close to the outer side of the corresponding quick release connecting piece, and the connecting shell is fixedly connected with the two first plates and the corresponding second plate, the connecting shell is fixedly connected with the side wall of the corresponding quick release connecting piece, and the connecting shell is further provided with a avoiding through hole for avoiding the driving worm.

[0017] Preferably, the first plate and the connecting shell are respectively formed with limiting convex strips and limiting grooves for mutual clamping and cooperation, one end of the driving worm close to the outer side of the corresponding quick release connecting piece protrudes from the connecting shell, and the end is further formed with a hexagonal column, and the corresponding end of the connecting shell is formed with a limiting sleeve for shaft connection with the end of the driving worm.

[0018] Preferably, the side wall of each quick release connecting piece is provided with a side opening cover for protecting the locking mechanism.

[0019] Preferably, the cylinder head and the cylinder cover are respectively formed with first and second stepped portions for limiting the end of the cylinder sleeve, and the cylinder cover and the cylinder head are respectively provided with a vent and an oil port, and the two ends of the cylinder cover are respectively embedded with first and second sealing rings for abutting against the corresponding ends of the first and second stepped portions.

[0020] Preferably, the piston assembly comprises:

[0021] The sliding rod is arranged in the cylinder cover, and the inner wall of the cylinder cover is provided with a first guide ring, a third sealing ring and a dustproof ring which are sleeved on the sliding rod;

[0022] The piston is fixedly sleeved on one end of the sliding rod in the cylinder cover and is arranged in the cylinder sleeve, the inner wall of the piston is provided with a fourth sealing ring which is sleeved on the end of the sliding rod, and the outer wall of the piston is further sleeved with two second guide rings and a fifth sealing ring which are close to the inner wall of the cylinder sleeve.

[0023] Compared with the prior art, the present application has the following beneficial effects:

[0024] Firstly, the present application is provided with a cylinder sleeve which is in sliding connection with the piston in the cylinder, which can protect the cylinder when there is more water in the rod cavity;

[0025] Secondly, the cylinder cover and the cylinder head of the present application are connected to the cylinder by quick release connecting pieces and locking mechanisms, which can ensure that the cylinder sleeve in the cylinder can be quickly and conveniently replaced after rusting. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a three-dimensional structure schematic diagram of the embodiment.

[0027] Figure 2 It is a schematic diagram of the internal structure of the cylinder of the embodiment.

[0028] Figure 3 is Figure 2 is an enlarged view of the local structure at A in FIG.

[0029] Figure 4 is a sectional view of the cylinder head of the embodiment.

[0030] Figure 5 is a partial exploded perspective view of the embodiment. Figure 1 .

[0031] Figure 6 is a partial exploded perspective view of the embodiment. Figure 2 .

[0032] Figure 7 is a partial exploded perspective view of the locking mechanism of the embodiment.

[0033] Figure 8 is a top view of the embodiment.

[0034] Figure 9 is Figure 8 is a sectional view along line B-B.

[0035] Figure 10 is Figure 9 is an enlarged view of the local structure at C in FIG.

[0036] Reference signs in the drawings are:

[0037] 1 - cylinder barrel; 2 - cylinder sleeve; 3 - cylinder head; 4 - cylinder cover; 5 - quick release connector; 6 - first axial slot; 7 - arc-shaped through slot; 8 - second axial slot; 9 - limiting protrusion; 10 - arc-shaped protrusion; 11 - plug-in recess; 12 - anti-disengagement recess; 13 - fixing box; 14 - axial worm gear; 15 - arc-shaped rack; 16 - driving worm; 17 - first flat plate; 18 - rotating shaft; 19 - second flat plate; 20 - connecting housing; 21 - limiting protrusion; 22 - hexagonal protrusion; 23 - limiting sleeve; 24 - side-opening flip cover; 25 - air vent; 26 - oil inlet; 27 - first sealing ring; 28 - second sealing ring; 29 - sliding rod; 30 - first guide ring; 31 - third sealing ring; 32 - dustproof ring; 33 - piston; 34 - fourth sealing ring; 35 - second guide ring; 36 - fifth sealing ring. DETAILED DESCRIPTION

[0038] In order to further understand the features, technical means and specific purposes and functions achieved by the present application, the present application will be described in further detail below with reference to the drawings and specific embodiments.

[0039] Reference Figures 1 to 10The illustrated modular single-acting oil cylinder with a rust-proof cylinder sleeve comprises a cylinder barrel 1 in a hollow cylindrical structure and a piston assembly, a cylinder sleeve 2 abutting the inner wall of the cylinder barrel 1 is coaxially inserted into the cylinder barrel 1, and the piston assembly is slidingly arranged in the cylinder sleeve 2, and cylinder heads 3 and cylinder covers 4 for limiting the end of the piston assembly are arranged at both ends of the cylinder barrel 1, respectively, and the cylinder heads 3 and the cylinder covers 4 are sealingly connected to the corresponding ends of the cylinder barrel 1 through a quick release connector 5, and a locking mechanism with a self-locking function for driving the cylinder heads 3 and the cylinder covers 4 to rotate around the axis of the cylinder barrel 1 and clamping the cylinder barrel 1 is arranged in each quick release connector 5.

[0040] When installing, the cylinder sleeve 2 is first inserted into the cylinder barrel 1 and the cylinder sleeve 2 and the cylinder barrel 1 are aligned at both ends, then the cylinder head 3 is fixedly connected to one end of the cylinder barrel 1 through the corresponding locking mechanism and quick release connector 5, the piston assembly is slidingly inserted into the cylinder sleeve 2 from the other end of the cylinder barrel 1, then the cylinder cover 4 is slidingly arranged on the piston assembly after another locking mechanism and quick release connector 5 are installed, and the cylinder cover 4 is fixed through the corresponding locking mechanism and quick release connector 5, so that when the cylinder sleeve 2 needs to be replaced, the cylinder cover 4 or the cylinder head 3 can be quickly removed through the quick release connector 5 and the locking mechanism, and then the piston assembly can be easily removed to replace the cylinder sleeve 2.

[0041] Each quick release connector 5 is in a circular ring structure, two groups of limiting clamping grooves in a symmetrical state for connecting the corresponding quick release connector 5 are formed on the outer walls of both ends of the cylinder barrel 1, and a clamping piece for clamping in the corresponding limiting clamping groove is fixedly connected to one end of the inner wall of each quick release connector 5. When installing the quick release connector 5, the clamping piece needs to be aligned with the limiting clamping groove, and then the quick release connector 5 is slidingly arranged on the cylinder barrel 1, and the locking mechanism is used to fix the cylinder cover 4 or the cylinder head 3, which is more convenient and faster than the traditional bolt connection.

[0042] The limiting slots are four limiting grooves distributed at equal angles around the axis of the cylinder barrel 1, each of the limiting grooves comprises a first axial groove 6 extending from one end of the cylinder barrel 1 to the other end along the axis of the cylinder barrel 1, an arc-shaped through groove 7 rotating at a certain angle around the axis of the cylinder barrel 1 from the end of the first axial groove 6 away from the cylinder barrel 1, and a second axial groove 8 extending from the end of the arc-shaped through groove 7 away from the first axial groove 6 to the end of the cylinder barrel 1 along the axis of the cylinder barrel 1 but not protruding from the end of the cylinder barrel 1, and the clamping pieces comprise four limiting protrusions 9 corresponding to the four limiting grooves and welded on the inner wall of the quick release connector 5. When installing the quick release connector 5, first align the limiting protrusions 9 with the corresponding first axial grooves 6, then coaxially slide the quick release connector 5 on the cylinder barrel 1 until each limiting protrusion 9 is inserted into the bottom of the first axial groove 6, then rotate the quick release connector 5 along the rotation direction of the arc-shaped through groove 7 until each limiting protrusion 9 is rotated to the end of the arc-shaped through groove 7 away from the first axial groove 6, then axially translate the quick release connector 5 along the extension direction of the second axial groove 8 until the limiting protrusion 9 abuts against the end of the second axial groove 8 away from the arc-shaped through groove 7, facilitating the subsequent installation of the cylinder cover 4 or the cylinder head 3.

[0043] The cylinder cover 4 is welded with four arc-shaped protrusions 10 distributed at equal angles along the axis of the cylinder cover 4 and having a T-shaped structure in cross section near one end corresponding to the quick release connector 5, the narrow end of the arc-shaped protrusion 10 is fixedly connected with the cylinder cover 4, and each of the other end of the corresponding quick release connector 5 away from the other quick release connector 5 is provided with four clamping grooves distributed at equal angles along the axis and corresponding to the four arc-shaped protrusions 10, one end of each clamping groove is an insertion groove 11 for axially inserting the corresponding arc-shaped protrusion 10, and the other end of the clamping groove is a anti-extrusion groove 12 for rotating the arc-shaped protrusion 10 around the axis of the cylinder barrel 1 and preventing the arc-shaped protrusion 10 from extruding out of the quick release connector 5, the wider end of the arc-shaped protrusion 10 is of a structure with one side higher than the other side near one side of the cylinder cover 4 and the side near the insertion groove 11 is higher, and the connection mode of the cylinder head 3 and the corresponding quick release connector 5 is consistent with that of the cylinder cover 4 and the corresponding quick release connector 5. After moving the limiting protrusion 9 of the corresponding quick release connector 5 to the end of the arc-shaped through groove 7 away from the first axial groove 6, the cylinder cover 4 can be installed, the cylinder cover 4 is slidably arranged on the piston assembly and then on the corresponding end of the cylinder barrel 1, then the quick release connector 5 is translated along the second axial groove 8, and at the same time, the arc-shaped protrusion 10 on the cylinder cover 4 is aligned with the insertion groove 11, then the cylinder cover 4 and the quick release connector 5 are moved towards each other until the arc-shaped protrusion 10 abuts against the bottom of the insertion groove 11, for reference Figure 4As shown, the a end of the arc-shaped protrusion 10 is higher and the b end is lower. When the arc-shaped protrusion 10 is slidingly inserted into the anti-falling groove 12 and continuously slides, the arc-shaped protrusion 10 will gradually abut against the anti-falling groove 12. Since the quick-release limiting part is limited on the cylinder barrel 1 and can only slide axially, the arc-shaped protrusion 10 will provide a pulling force along the axial direction of the cylinder barrel 1. In combination with the corresponding end of the cylinder cover 4 abutting against the corresponding end of the cylinder barrel 1, the cylinder cover 4 and the corresponding quick-release connecting part 5 will be tightly held on the end of the cylinder barrel 1, thereby completing the locking. The connection mode of the cylinder head 3 is consistent with that of the cylinder cover 4, but the cylinder head 3 does not contact the other end of the piston assembly.

[0044] Each of the locking mechanisms comprises:

[0045] A fixed box 13 is fixedly inserted into the side wall of the quick-release connecting part 5 corresponding to one of the arc-shaped protrusions 10;

[0046] An axial worm wheel 14 is axially arranged in the fixed box 13 and parallel to the axis of the corresponding quick-release connecting part 5. The corresponding arc-shaped protrusion 10 is fixedly connected with an arc-shaped rack 15 for cooperation with the worm wheel. The end of the quick-release connecting part 5 corresponding to the clamping groove close to the other quick-release connecting part 5 is also provided with an avoiding through slot for rotation of the corresponding arc-shaped rack 15;

[0047] A driving worm 16 is axially arranged in the fixed box 13 and engaged with the axial worm wheel 14.

[0048] Since the locking mechanism is arranged in the outer wall of the quick-release connector 5, and the arc-shaped rack 15 is arranged on the arc-shaped protrusion 10, and the arc-shaped rack 15 may not be precisely engaged with the axial worm gear 14 after being axially slid after being inserted into the arc-shaped protrusion 10. If the arc-shaped rack 15 is in contact with the axial worm gear 14 and cannot be engaged, there must be a gap between the cylinder cover 4 or the cylinder head 3 and the corresponding quick-release connector 5 and the cylinder barrel 1. At this time, it can be distinguished by visual observation. If it is really indistinguishable, the arc-shaped rack 15 can be axially slid for a distance and cannot be slid. Then, the axial worm gear 14 is slightly adjusted by driving the worm 16, and a small amount of pressure is applied to make the cylinder cover 4 or the cylinder head 3 adhere to the corresponding quick-release connector 5. After slight adjustment, the outer teeth of the axial worm gear 14 should be engaged with the outer teeth of the arc-shaped rack 15. Then, the arc-shaped rack 15 can be rotated around the axis of the cylinder barrel 1 by the axial worm gear 14. Then, the cylinder cover 4 or the cylinder head 3 can be locked with the corresponding quick-release connector 5. Since the driving worm 16 and the axial worm gear 14 are matched and have a self-locking function, and the arc-shaped protrusion 10 has a tendency to move in the direction of the plug-in recess 11 after being locked, the arc-shaped rack 15 will provide a force to drive the axial worm gear 14 to rotate. Therefore, after the arc-shaped protrusion 10 is locked, the axial worm gear 14 will provide a self-locking force to the driving worm 16, thereby ensuring that when the cylinder cover 4 or the cylinder head 3 is locked on the corresponding quick-release connector 5, the driving worm 16 can ensure that the cylinder cover 4 and the cylinder head 3 are locked on the quick-release connector 5 without external force.

[0049] The fixing box 13 comprises:

[0050] Two first plates 17 in a symmetrical state, the axial worm gear 14 is arranged between the two first plates 17 through a shaft 18, and the two sides of the two first plates 17 are fixedly connected through two second plates 19 in a symmetrical state, and the two ends of the driving worm 16 are respectively arranged in the corresponding second plates 19 through shafts;

[0051] A connecting shell 20 is arranged at one end of the two first plates 17 close to the outer side of the corresponding quick-release connector 5, and the connecting shell 20 is fixedly connected with the two first plates 17 and the corresponding second plates 19, and the connecting shell 20 is fixedly connected with the side wall of the corresponding quick-release connector 5, and the connecting shell 20 is also provided with a avoiding through hole for avoiding the driving worm 16.

[0052] The corresponding end of the driving worm 16 extends out of the avoiding through hole to facilitate the application of external force to rotate. The connecting shell 20 plays a role in reinforcing the first plate 17 and the second plate 19 on the one hand, and fixes the locking mechanism in the outer wall of the quick-release connector 5 on the other hand.

[0053] Each of the first flat plate 17 and the connecting shell 20 is respectively formed with a limiting convex strip 21 and a limiting groove for mutual clamping and fitting, the driving worm 16 protrudes from the connecting shell 20 at one end close to the outer side of the corresponding quick-release connecting piece 5, and the end is further formed with a hexagonal convex column 22, and the corresponding end of the connecting shell 20 is formed with a limiting sleeve 23 for shaft connection with the end of the driving worm 16. The limiting convex strip 21 cooperates with the limiting groove to further ensure the smooth installation of the connecting shell 20 with the first flat plate 17 and the second flat plate 19, the corresponding end of the driving worm 16 is shaft-connected in the limiting sleeve 23 to rotate more stably, and the end of the hexagonal convex column 22 is convenient for the sleeve connection of an external wrench sleeve to rotate the driving worm 16.

[0054] Each of the side walls of the quick-release connecting piece 5 is provided with a side-opening cover 24 for protecting the locking mechanism. The side-opening cover 24 ensures that the driving worm 16 is not disturbed by external force during the normal operation of the oil cylinder, thereby affecting the connection between the cylinder head 4 or the cylinder head 3 and the cylinder barrel 1, thereby ensuring the safety of the whole.

[0055] The corresponding ends of the cylinder head 3 and the cylinder cover 4 are respectively formed with a first step part and a second step part for limiting the end of the corresponding end of the cylinder sleeve 2, and the cylinder cover 4 and the cylinder head 3 are respectively provided with a vent 25 and an oil port 26, and the two ends of the cylinder cover 4 are respectively embedded with a first sealing ring 27 and a second sealing ring 28 for abutting against the corresponding ends of the first step part and the second step part. The pressure oil enters and exits from the oil port 26 of the cylinder head 3, thereby ensuring the operation of the piston assembly, the vent 25 ensures the circulation of the gas inside and outside the rod cavity, thereby ensuring the normal operation of the piston assembly, the first sealing ring 27 is used to prevent the humid air outside the rod cavity from entering the cylinder barrel 1 to cause the rust of the cylinder sleeve 2, and the second sealing ring 28 is used to ensure the sealing of the rodless cavity.

[0056] The piston assembly comprises:

[0057] A sliding rod 29, one end of which protrudes out of the cylinder barrel 1 and is slidingly arranged in the cylinder cover 4, a first guide ring 30, a third sealing ring 31 and a dustproof ring 32 are arranged on the inner wall of the cylinder cover 4 and are slidingly arranged on the sliding rod 29;

[0058] A piston 33, which is fixedly sleeved on one end of the sliding rod 29 located in the cylinder cover 4 and is slidingly arranged in the cylinder sleeve 2, the inner wall of the piston 33 is provided with a fourth sealing ring 34 sleeved on the end of the sliding rod 29, and the outer wall of the piston 33 is further sleeved with two second guide rings 35 and a fifth sealing ring 36 abutting against the inner wall of the cylinder sleeve 2.

[0059] The first guide ring 30 and the second guide ring 35 are both elastic rings with no closure and low surface friction coefficient. The first guide ring 30 is used to ensure smooth sliding of the sliding rod 29 on the cylinder head 4, and the second guide ring 35 is used to ensure smooth sliding of the piston 33 in the cylinder sleeve 2. The third sealing ring 31 is used to prevent humid air outside the rod cavity from entering the cylinder 1 to rust the cylinder sleeve 2. The dustproof ring 32 is used to ensure that impurities on the sliding rod 29 do not enter the cylinder 1 when the sliding rod 29 is retracted into the cylinder 1.

[0060] The above embodiments only express one or several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as a limitation on the scope of the patent of the present application. It should be noted that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A modular single-acting hydraulic cylinder with a rust-resistant cylinder liner, comprising a cylinder barrel (1) with a hollow cylindrical structure and a piston assembly, characterized in that, The cylinder (1) is coaxially inserted with a cylinder sleeve (2) that is close to its inner wall, and the piston assembly is slidably disposed in the cylinder sleeve (2). The cylinder (1) is also provided with a cylinder head (3) and a cylinder cover (4) for limiting the end of the piston assembly. The cylinder head (3) and the cylinder cover (4) are sealed to the corresponding end of the cylinder (1) through a quick-release connector (5). Each quick-release connector (5) is provided with a locking mechanism that has a self-locking function and is used to drive the cylinder head (3) and the cylinder cover (4) to rotate around the cylinder (1) axis and lock the cylinder (1). The cylinder head (4) has four arc-shaped protrusions (10) with T-shaped cross-sections welded to one end near the corresponding quick-release connector (5). The narrow end of the arc-shaped protrusion (10) is fixedly connected to the cylinder head (4). The end of the quick-release connector (5) opposite to the other quick-release connector (5) is provided with four locking grooves with equal angles along their axes, each corresponding to one of the four arc-shaped protrusions (10). One end of each locking groove is for axial insertion of the corresponding arc-shaped protrusion (10). The insertion groove (11) is clamped at the other end of the groove, which is a groove (12) for the arc-shaped protrusion (10) to rotate around the cylinder barrel (1) axis and prevent the arc-shaped protrusion (10) from coming out of the quick-release connector (5). The wider end of the arc-shaped protrusion (10) is close to the cylinder head (4) with a structure that is high on one side and low on the other, and the side close to the insertion groove (11) is higher. The connection method between the cylinder head (3) and the corresponding quick-release connector (5) is the same as the connection method between the cylinder head (4) and the corresponding quick-release connector (5). Each of the aforementioned locking mechanisms includes: The fixing box (13) is fixedly inserted into the side wall of the quick-release connector (5) corresponding to one of the arc-shaped protrusions (10); An axial worm gear (14) is axially mounted in a fixed box (13) and is parallel to the axis of the corresponding quick-release connector (5). An arc-shaped rack (15) for cooperating with the worm gear is fixedly connected to the corresponding arc-shaped protrusion (10). The quick-release connector (5) has a clearance groove at one end of the corresponding locking groove near another quick-release connector (5) for allowing the corresponding arc-shaped rack (15) to rotate. The drive worm (16) is axially mounted in the fixed box (13) and meshes with the axial worm wheel (14); The fixing box (13) includes: Two symmetrical first plates (17) are connected together. The axial worm gear (14) is axially connected between the two first plates (17) by a rotating shaft (18). The two sides of the two first plates (17) are fixedly connected by two symmetrical second plates (19). The two ends of the drive worm (16) are respectively axially connected in the corresponding second plates (19). The connecting housing (20) is located at one end of the two first plates (17) near the outer side of the corresponding quick-release connector (5), and the connecting housing (20) is fixedly connected to the two first plates (17) and the corresponding second plate (19). The connecting housing (20) is fixedly connected to the side wall of the corresponding quick-release connector (5), and the connecting housing (20) is also provided with a clearance through hole for avoiding the drive worm (16). Each of the first plate (17) and the connecting housing (20) is respectively formed with a limiting protrusion (21) and a limiting groove for interlocking. The end of the drive worm (16) near the outside of the corresponding quick-release connector (5) protrudes out of the connecting housing (20) and is also formed with a hexagonal protrusion (22). The corresponding end of the connecting housing (20) is formed with a limiting sleeve (23) for shaft connection with the end of the drive worm (16). Each of the quick-release connectors (5) has a side-opening flip cover (24) on its side wall for protecting the locking mechanism.

2. A modular single-acting hydraulic cylinder with a rust-proof cylinder liner according to claim 1, characterized in that, Each of the quick-release connectors (5) has a circular structure. Two sets of symmetrical limiting slots are provided on the outer walls of both ends of the cylinder (1) for connecting the corresponding quick-release connectors (5). One end of the inner wall of each quick-release connector (5) is fixedly connected with a clamping member for clamping in the corresponding limiting slot.

3. A modular single-acting hydraulic cylinder with a rust-proof cylinder liner according to claim 2, characterized in that, The limiting slots are four limiting slots distributed at equal angles around the axis of the cylinder (1). Each limiting slot includes a first axial slot (6) extending from the corresponding end of the cylinder (1) along the axis of the cylinder (1) to the other end, an arc-shaped through slot (7) rotating a certain angle around the axis of the cylinder (1) from the end of the first axial slot (6) away from the cylinder (1), and a second axial slot (8) extending from the end of the arc-shaped through slot (7) away from the first axial slot (6) along the axis of the cylinder (1) towards the cylinder (1) but not protruding from the cylinder (1). The clamping member includes four limiting protrusions (9) that correspond one-to-one with the four limiting slots and are welded to the inner wall of the quick-release connector (5).

4. A modular single-acting hydraulic cylinder with a rust-proof cylinder liner according to claim 1, characterized in that, The cylinder head (3) and cylinder cover (4) are respectively formed with a first step and a second step for end limiting of the corresponding end of the cylinder sleeve (2). The cylinder cover (4) and cylinder head (3) are also respectively provided with a vent (25) and an oil inlet (26). The two ends of the cylinder cover (4) are respectively provided with a first sealing ring (27) and a second sealing ring (28) that elastically abut against the corresponding ends of the first step and the second step.

5. A modular single-acting hydraulic cylinder with a rust-proof cylinder liner according to claim 1, characterized in that, The piston assembly includes: A sliding rod (29) has one end extending out of the cylinder (1) and is slidably disposed inside the cylinder cover (4). The inner wall of the cylinder cover (4) is provided with a first guide ring (30), a third sealing ring (31) and a dustproof ring (32) that are slidably sleeved on the sliding rod (29). The piston (33) is fixedly sleeved on one end of the sliding rod (29) located inside the cylinder head (4) and slidably disposed inside the cylinder sleeve (2). The piston (33) is provided with a fourth sealing ring (34) sleeved on the end of the sliding rod (29). The piston (33) is also provided with two second guide rings (35) and a fifth sealing ring (36) tightly attached to the inner wall of the cylinder sleeve (2).

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