Leak-proof hydraulic machine oil cylinder

Abstract

The invention discloses an anti-leakage hydraulic machine oil cylinder, and relates to the technical field of oil cylinders, the anti-leakage hydraulic machine oil cylinder comprises a cylinder barrel and a piston rod, and a first oil hole and a second oil hole which are communicated with the interior of the cylinder barrel are formed in the tops of the two ends of the cylinder barrel respectively; a first oil pipe is communicated with the interior of the first oil hole, a second oil pipe is communicated with the interior of the second oil hole, protection boxes are arranged between the first oil hole and the first oil pipe and between the second oil hole and the second oil pipe, and impurity filtering assemblies for filtering hydraulic oil flowing in from the first oil pipe and the second oil pipe are arranged in the protection boxes. Hydraulic oil flowing in and out from the first oil hole or the second oil hole is limited by the flow direction limiting mechanism in the impurity filtering assembly, so that the situation that the hydraulic oil flowing in the reverse direction drives impurities filtered by the filter screen to flow back into an oil tank is avoided, it is guaranteed that the hydraulic oil in the oil tank is clean, and the service life of the oil tank is prolonged. Therefore, the effects of filtering impurities and preventing leakage are further achieved.

Description

Technical Field

[0001] The invention relates to the technical field of oil cylinders, in particular to an anti-leakage hydraulic cylinder. Background Art

[0002] The oil cylinder is an actuator in the hydraulic system of the hydraulic cylinder. It is generally composed of a cylinder body, a cylinder rod (piston rod) and a seal. The inside of the cylinder body is divided into two parts by the piston, and the two parts are connected to an oil hole. The hydraulic cylinder has 5 basic components: 1. Cylinder barrel and cylinder head, 2. Piston and piston rod, 3. Sealing device, 4. Buffer device, 5. Exhaust device. Since the compression ratio of the liquid is very small, when oil enters one of the oil holes, the piston will be pushed to make the other oil hole discharge oil, and the piston drives the piston rod to extend (retract) and vice versa.

[0003] Oil cylinders are often used in mechanical equipment such as hydraulic presses that need to move up and down to process parts. It is known that the telescopic movement of the oil cylinder depends on the inflow and outflow of the hydraulic oil inside the cylinder. In the prior art of publication number CN214304645U, in order to prevent the impurities in the hydraulic oil from causing friction on the seals in the cylinder and causing leakage of the hydraulic oil, filter plates for filtering the hydraulic oil are set at the inlet and outlet pipes. Because the flow of the hydraulic oil in the oil cylinder needs to be carried out on both sides of the piston and will pass through the oil tank during the flow process, the impurities filtered by the filter plate in this technical solution will flow back to the inside of the oil tank with the hydraulic oil after the hydraulic oil reverses, thereby affecting the quality of the hydraulic oil in the oil tank. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a leakage-proof hydraulic cylinder. Through the restriction of the flow direction restriction mechanism inside the impurity filtering component, the hydraulic oil flowing in and out of oil hole one or oil hole two respectively flows through two different paths, so as to prevent the reverse flow of hydraulic oil from driving impurities filtered by the filter back into the oil tank, which helps to ensure the cleanliness of the hydraulic oil in the oil tank, so as to further achieve the effect of filtering impurities and preventing leakage, and can effectively solve the problems in the background technology.

[0005] To achieve the above object, the technical solution adopted by the present invention is: an anti-leakage hydraulic cylinder, comprising a cylinder barrel and a piston rod, one end of the piston rod with a piston installed is inserted into the cylinder barrel, and the other end of the piston rod extends out of the cylinder barrel, and the tops of both ends of the cylinder barrel are respectively provided with an oil hole 1 and an oil hole 2 connected to the inside of the cylinder barrel;

[0006] The first oil hole is connected to the inside of the first oil pipe, the second oil hole is connected to the inside of the second oil pipe, a protection box is provided between the first oil hole and the first oil pipe, and between the second oil hole and the second oil pipe, and an impurity filtering component is provided inside the protection box to filter the hydraulic oil flowing in from the first oil pipe and the second oil pipe;

[0007] The impurity filtering assembly includes a vertical pipe connected to the bottom end of the first oil pipe or the bottom end of the second oil pipe, one side of the bottom end of the vertical pipe is connected with a second elbow pipe, the bottom end of the second elbow pipe is connected to the inside of the oil hole one or the inside of the oil hole two, the bottom end of the vertical pipe is connected with a filter pipe, and a filter screen for filtering impurities is fixed to the bottom end of the filter pipe. The filter pipe is located on one side of the second elbow pipe, and the bottom end of the filter pipe is connected with the first elbow pipe, and the first elbow pipe is connected to the inside of the second elbow pipe away from one end of the filter pipe. The inside of the vertical pipe, the first elbow pipe and the second elbow pipe are all provided with a flow direction limiting mechanism for limiting the flow direction of hydraulic oil. The hydraulic oil flowing in from the first oil pipe or the second oil pipe passes through the vertical pipe, the filter pipe, the first elbow pipe and the bottom end of the second elbow pipe in turn and flows into the inside of the oil hole one or the oil hole two, and the hydraulic oil flowing out from the cylinder barrel passes through the second elbow pipe, the vertical pipe, the first oil pipe or the second oil pipe in turn and flows out.

[0008] Preferably, there are two flow direction limiting mechanisms in the second curved pipe, and the two flow direction limiting mechanisms are respectively located at the top end of the second curved pipe and above the bottom end of the first curved pipe.

[0009] Preferably, the flow direction limiting mechanism comprises a fixing seat, the fixing seat is fixed in the inner wall of the vertical pipe, the inner wall of the first curved pipe or the inner wall of the second curved pipe, a sealing plug is inserted in the fixing seat, a second sealing ring is inlaid on the sealing plug, a plurality of springs are fixed at equal intervals on a side wall of the sealing plug close to the fixing seat, a plurality of circular holes are opened on a side of the fixing seat close to the sealing plug, the springs are arranged inside the circular holes and fixed to the fixing seat;

[0010] The sealing plug has a convex cross-section, and comprises a blocking block inserted in the interior of the fixing seat and a limiting block arranged outside the fixing seat, wherein the blocking block has a cross-sectional diameter that is the same as the inner diameter of the fixing seat, and the limiting block has a cross-sectional diameter that is larger than the inner diameter of the fixing seat;

[0011] The limit block located inside the filter tube contacts the bottom of the fixed seat, the limit block located inside the first bent pipe contacts the side wall of the fixed seat close to the second bent pipe, the limit block located at the bottom end of the second bent pipe contacts the bottom of the fixed seat, and the limit block located at the top end of the second bent pipe contacts the side wall of the fixed seat close to the vertical pipe.

[0012] Preferably, the outer wall at the top and the outer wall at the bottom of the filter pipe are both threadedly connected with threaded sleeves, and the two threaded sleeves are respectively threadedly connected to the bottom end of the vertical pipe and the top end of the first elbow.

[0013] Preferably, a first sealing ring is embedded in the middle of the inner wall of the threaded sleeve.

[0014] Preferably, a flow rate sensor is provided at the bottom end of the first bend pipe, and the probe rod of the flow rate sensor extends into the first bend pipe to monitor the flow rate of the hydraulic oil inside the first bend pipe. A buzzer is provided on one side of the first oil pipe or the second oil pipe, and an MCU control chip is provided on the front side of the first oil pipe. When the first bend pipe detects that the flow rate of the hydraulic oil is lower than the set value, the MCU control chip controls the buzzer to make a sound.

[0015] Preferably, the protection box includes a box body, the buzzer is installed on one side of the top of the box body, the MCU control chip is installed on the front side of the box body at the bottom of the first oil pipe, the flow rate sensor is located outside the box body, and the probe rod of the flow rate sensor penetrates the box body and extends into the inside of the box body;

[0016] The box body covers the outside of the vertical pipe, the filter pipe, the first curved pipe and the second curved pipe.

[0017] Preferably, the protective box also includes a through hole opened on one side of the box body, a plug plate is inserted into the through hole, a handle is fixed to the front side of the plug plate, two bolts distributed up and down are provided on one side of the plug plate, and the plug plate is fixed to the box body through the bolts.

[0018] Compared with the prior art, the present invention provides a leakage-proof hydraulic cylinder, which has the following beneficial effects:

[0019] 1. An impurity filter assembly is connected to the top of the oil hole 1 and the top of the oil hole 2 respectively to filter out impurities in the hydraulic oil flowing into the cylinder, so as to prevent the impurities from entering the cylinder and causing wear to the seal inside the cylinder and causing oil leakage. In addition, under the restriction of the flow restriction mechanism inside the impurity filter assembly, the hydraulic oil flowing in and out of the oil hole 1 or the oil hole 2 respectively flows through two different paths to prevent the reverse flow of hydraulic oil from driving the impurities filtered by the filter to flow back into the oil tank, which helps to ensure the cleanliness of the hydraulic oil in the oil tank and further achieve the effect of filtering impurities and preventing leakage.

[0020] 2. The filter pipe with the filter screen installed inside is detachably installed between the vertical pipe and the first elbow by using two threaded sleeves, so that people can remove the filter pipe and then clean the impurities attached to the filter screen to ensure the filtering effect of the impurities.

[0021] 3. Use the flow rate sensor to detect the flow rate of the liquid inside the first bend. When the flow rate of the liquid inside the first bend decreases, it means that the mesh of the filter is blocked by impurities, and the degree of impurity blockage is inversely proportional to the flow rate of the liquid in the first bend. The slower the flow rate, the more serious the blockage of the filter. When the flow rate detected by the flow rate sensor is lower than the set minimum flow rate, the MCU control chip will control the buzzer to sound to remind people, so that people can clean the impurities on the filter in time, further ensuring the filtering effect of impurities. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the present invention;

[0023] Figure 2 A top view of the present invention;

[0024] Figure 3 It is a cross-sectional view of the protection box of the present invention;

[0025] Figure 4 For the present invention Figure 3 A magnified view of middle;

[0026] Figure 5 It is an exploded view of the protection box and the first and second oil holes of the present invention;

[0027] Figure 6 For the present invention Figure 5 Enlarged view of middle B;

[0028] Figure 7 It is a structural schematic diagram of the impurity filtering assembly of the present invention;

[0029] Figure 8 For the present invention Figure 7 Enlarged view of middle C;

[0030] Fig. 9 It is a structural schematic diagram of the flow direction limiting mechanism of the present invention.

[0031] In the figure:

[0032] 1 cylinder barrel, 2 piston rod, 3 oil hole 1, 4 oil hole 2, 5 first oil pipe, 6 second oil pipe;

[0033] 7 protection box, 71 box body, 72 through hole, 73 plug plate, 74 handle, 75 bolt;

[0034] 8 impurity filtering assembly, 81 vertical pipe, 82 impurity filtering pipe, 83 first elbow pipe, 84 second elbow pipe, 85 threaded sleeve, 86 first sealing ring, 87 filter screen, 88 flow direction limiting mechanism, 89 flow rate sensor, 810 buzzer, 811 MCU control chip;

[0035] 881 fixing seat, 882 sealing plug, 883 second sealing ring, 884 spring, 885 round hole. DETAILED DESCRIPTION

[0036] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0037] like Figure 1-3As shown, the present invention provides a leak-proof hydraulic cylinder, comprising a cylinder barrel 1 and a piston rod 2, wherein one end of the piston rod 2 with a piston installed is inserted into the cylinder barrel 1, and the other end of the piston rod 2 extends out of the cylinder barrel 1, and the tops of both ends of the cylinder barrel 1 are respectively provided with an oil hole 1 3 and an oil hole 2 4 connected with the inside of the cylinder barrel 1;

[0038] When the piston rod 2 in the present invention is to be extended, hydraulic oil will be injected into the cylinder 1 through the first oil pipe 5, and the hydraulic oil in the cylinder 1 will be discharged through the second oil pipe 6. Conversely, when the piston rod 2 is to be retracted, the hydraulic oil will enter the cylinder 1 through the second oil pipe 6, and then the hydraulic oil in the cylinder 1 will be discharged through the first oil pipe 5, thereby completing the extension and retraction action of the piston rod 2.

[0039] In order to ensure the sealing performance of the sealing parts inside the cylinder barrel 1 and prevent the hydraulic oil from leaking, the first oil pipe 5 is connected inside the oil hole 1, and the second oil pipe 6 is connected inside the oil hole 2. A protection box 7 is provided between the oil hole 1 and the first oil pipe 5, and between the oil hole 2 and the second oil pipe 6. An impurity filter assembly 8 is provided inside the protection box 7 for filtering the hydraulic oil flowing in from the first oil pipe 5 and the second oil pipe 6. By filtering the hydraulic oil flowing into the cylinder barrel 1, it is possible to prevent the impurities in the hydraulic oil from causing wear to the sealing parts inside the cylinder barrel 1 and causing the hydraulic oil to leak.

[0040] Specifically, Figure 4 , 6 As shown in Figures 7 and 8, the impurity filtering assembly 8 includes a vertical pipe 81 connected to the bottom end of the first oil pipe 5 or the bottom end of the second oil pipe 6, one side of the bottom end of the vertical pipe 81 is connected to a second elbow pipe 84, the bottom end of the second elbow pipe 84 is connected to the inside of the oil hole 1 3 or the inside of the oil hole 2 4, the bottom end of the vertical pipe 81 is connected to a filter pipe 82, the bottom end of the filter pipe 82 is fixed with a filter screen 87 for filtering impurities, the filter pipe 82 is located on one side of the second elbow pipe 84, the bottom end of the filter pipe 82 is connected to a first elbow pipe 83, the first elbow pipe 83 is connected to the inside of the second elbow pipe 84 away from one end of the filter pipe 82, the vertical pipe 81, the first elbow pipe 83 and the second elbow pipe 84 are all provided with a flow direction limiting mechanism 88 for limiting the flow direction of hydraulic oil, and there are two flow direction limiting mechanisms 88 in the second elbow pipe 84, and the two flow direction limiting mechanisms 88 are respectively located at the top of the second elbow pipe 84 and above the bottom end of the first elbow pipe 83;

[0041] During the extension movement of the piston rod 2, the hydraulic oil flowing into the cylinder barrel 1 from the first oil pipe 5 will flow into the oil hole 3 through the vertical pipe 81, the filter pipe 82, the first bend pipe 83 and the bottom end of the second bend pipe 84 in sequence, and then flow into the cylinder barrel 1 through the oil hole 3. Then, the hydraulic oil will push the piston rod 2 to extend from the cylinder barrel 1. During the flow of the hydraulic oil, the filter screen 87 provided in the filter pipe 82 can filter the impurities in the hydraulic oil to prevent the impurities from entering the cylinder barrel 1, thereby achieving the effect of filtering impurities.

[0042] On the contrary, during the contraction movement of the piston rod 2, the hydraulic oil in the cylinder 1 passes through the oil hole 24, the second bend pipe 84, the vertical pipe 81 in sequence, and then flows out through the second oil pipe 6. In the present invention, the hydraulic oil flowing into the cylinder 1 and the hydraulic oil flowing out of the cylinder 1 pass through two different paths, so the outflowing hydraulic oil will not pass through the filter 87, nor will it drive the impurities filtered by the filter 87 to flow back into the oil tank, which helps to ensure the cleanliness of the hydraulic oil in the oil tank and further enhance the filtering effect of the present invention.

[0043] Furthermore, in the above process, the structure of the flow restriction mechanism 88 is as follows: Figure 8 and 9 As shown, the flow direction limiting mechanism 88 includes a fixing seat 881, which is fixed in the inner wall of the vertical pipe 81, the inner wall of the first elbow 83 or the inner wall of the second elbow 84. A sealing plug 882 is inserted into the fixing seat 881, and a second sealing ring 883 is inlaid on the sealing plug 882. A plurality of springs 884 are fixed at equal intervals on a side wall of the sealing plug 882 close to the fixing seat 881. A plurality of circular holes 885 are opened on one side of the fixing seat 881 close to the sealing plug 882. The springs 884 are arranged inside the circular holes 885 and fixed to the fixing seat 881.

[0044] Moreover, the cross-section of the sealing plug 882 is a convex shape, and the sealing plug 882 includes a sealing block inserted into the interior of the fixed seat 881 and a limiting block arranged outside the fixed seat 881. The cross-sectional diameter of the sealing block is the same as the inner diameter of the fixed seat 881, and the cross-sectional diameter of the limiting block is larger than the inner diameter of the fixed seat 881. The fixed seat 881 can be blocked by inserting the sealing block of the sealing plug 882 into the interior of the fixed seat 881. At the same time, the setting of the limiting block helps to limit the direction in which the sealing block moves out of the fixed seat 881. Figure 7As shown, the limit block located inside the filter pipe 82 contacts the bottom of the fixed seat 881, and the limit block located inside the first bend pipe 83 contacts the side wall of the fixed seat 881 close to the second bend pipe 84. Therefore, the fixed seat 881 and the sealing plug 882 installed inside the vertical pipe 81 and the first bend pipe 83 only allow the hydraulic oil to flow from the vertical pipe 81 to the first bend pipe 83. If the flow is reversed, the limit block will prevent the sealing plug 882 from moving out of the fixed seat 881. Similarly, the limit block located at the bottom end of the second bend pipe 84 contacts the bottom of the fixed seat 881, and the limit block located at the top end of the second bend pipe 84 contacts the side wall of the fixed seat 881 close to the vertical pipe 81. Therefore, the two fixed seats 881 and the sealing plug 882 installed inside the second bend pipe 84 only allow the hydraulic oil to flow from the bottom end of the second bend pipe 84 to the top end of the second bend pipe 84. Otherwise, the limit block will prevent the sealing plug 882 from moving out, so as to achieve the effect of limiting the flow direction of the hydraulic oil.

[0045] In addition, if Figure 4-6 As shown, the protection box 7 includes a box body 71 and a through hole 72 opened on one side of the box body 71, a plug plate 73 is inserted in the through hole 72, a handle 74 is fixed on the front side of the plug plate 73, two bolts 75 distributed up and down are provided on one side of the plug plate 73, and the plug plate 73 is fixed to the box body 71 through the bolts 75, and the box body 71 covers the outside of the vertical pipe 81, the filter pipe 82, the first bend pipe 83 and the second bend pipe 84. The box body 71 is provided to help protect the vertical pipe 81, the filter pipe 82, the first bend pipe 83 and the second bend pipe 84 from the outside;

[0046] Because the impurities filtered by the filter 87 in the present invention will accumulate on the filter 87, it is necessary to clean the impurities before the impurities completely block the filter 87. Figure 4 and 8 As shown, the outer wall of the top and bottom of the filter pipe 82 are both threadedly connected with threaded sleeves 85, and the two threaded sleeves 85 are threadedly connected with the bottom end of the vertical pipe 81 and the top end of the first curved pipe 83 respectively;

[0047] By loosening the bolt 75, pulling out the plug plate 73 inserted in the through hole 72, and then rotating the two threaded sleeves 85 toward the middle, the two threaded sleeves 85 can be removed from the bottom end of the vertical pipe 81 and the top end of the first curved pipe 83, so that the connection between the vertical pipe 81, the filter pipe 82 and the first curved pipe 83 can be released, so that the filter pipe 82 can be easily removed. In addition, a first sealing ring 86 is embedded in the middle of the inner wall of the threaded sleeve 85, which can also enhance the sealing of the connection. After the filter pipe 82 is removed, it is convenient for people to pour out the impurities on the filter screen 87, achieving a cleaning effect;

[0048] Moreover, in order to determine the clogging condition of the filter 87, a flow rate sensor 89 is provided at the bottom end of the first elbow 83, and the probe of the flow rate sensor 89 extends into the first elbow 83 to monitor the flow rate of the hydraulic oil in the first elbow 83. The flow rate sensor 89 is located outside the box 71, and the probe of the flow rate sensor 89 penetrates the box 71 and extends into the box 71. A buzzer 810 is provided on one side of the first oil pipe 5 or the second oil pipe 6, and the buzzer 810 is installed on one side of the top of the box 71. An MCU control chip 811 is provided on the front side of the first oil pipe 5, and the MCU control chip 811 is installed on the front side of the box 71 located at the bottom of the first oil pipe 5.

[0049] In the present invention, when the liquid flow rate inside the first bend pipe 83 decreases, it means that the mesh of the filter 87 is blocked by impurities, and the degree of impurity blockage is inversely proportional to the liquid flow rate in the first bend pipe 83. The slower the flow rate, the more serious the blockage of the filter 87. When the flow rate detected by the flow rate sensor 89 is lower than the set minimum flow rate, the MCU control chip 811 will control the buzzer 810 to sound to remind people, so that people can clean the impurities on the filter 87 in time, further ensuring the filtering effect of impurities.

[0050] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A leak-proof hydraulic cylinder, comprising a cylinder barrel (1) and a piston rod (2), wherein one end of the piston rod (2) having a piston installed thereon is inserted into the cylinder barrel (1), and the other end of the piston rod (2) extends out of the cylinder barrel (1), characterized in that: The tops of both ends of the cylinder (1) are respectively provided with an oil hole 1 (3) and an oil hole 2 (4) which are connected to the inside of the cylinder (1); The first oil hole (3) is connected to the inside of the first oil pipe (5), and the second oil hole (4) is connected to the inside of the second oil pipe (6). A protection box (7) is provided between the first oil hole (3) and the first oil pipe (5), and between the second oil hole (4) and the second oil pipe (6). The protection box (7) is provided with an impurity filtering assembly (8) for filtering the hydraulic oil flowing in from the first oil pipe (5) and the second oil pipe (6); The impurity filtering assembly (8) comprises a vertical pipe (81) connected to the bottom end of the first oil pipe (5) or the bottom end of the second oil pipe (6); one side of the bottom end of the vertical pipe (81) is connected to a second curved pipe (84); the bottom end of the second curved pipe (84) is connected to the inside of the first oil hole (3) or the inside of the second oil hole (4); the bottom end of the vertical pipe (81) is connected to a filter pipe (82); a filter screen (87) for filtering impurities is fixed to the bottom end of the filter pipe (82); the filter pipe (82) is located on one side of the second curved pipe (84); the bottom end of the filter pipe (82) is connected to a first curved pipe (83); the first curved pipe (83) is away from the filter pipe (82). One end of the filter pipe (82) is connected to the inside of the second curved pipe (84); the inside of the vertical pipe (81), the inside of the first curved pipe (83) and the inside of the second curved pipe (84) are all provided with a flow direction limiting mechanism (88) for limiting the flow direction of the hydraulic oil; the hydraulic oil flowing in from the first oil pipe (5) or the second oil pipe (6) flows through the vertical pipe (81), the filter pipe (82), the first curved pipe (83) and the bottom end of the second curved pipe (84) in sequence into the inside of the oil hole 1 (3) or the oil hole 2 (4); the hydraulic oil flowing out of the cylinder barrel (1) flows out through the second curved pipe (84), the vertical pipe (81), the first oil pipe (5) or the second oil pipe (6) in sequence.

2. The anti-leakage hydraulic cylinder according to claim 1, characterized in that: There are two flow direction limiting mechanisms (88) in the second curved pipe (84), and the two flow direction limiting mechanisms (88) are respectively located at the top end of the second curved pipe (84) and above the bottom end of the first curved pipe (83).

3. The anti-leakage hydraulic cylinder according to claim 1, characterized in that: The flow direction limiting mechanism (88) comprises a fixed seat (881), the fixed seat (881) is fixed to the inner wall of the vertical pipe (81), the inner wall of the first curved pipe (83) or the inner wall of the second curved pipe (84), a sealing plug (882) is inserted into the interior of the fixed seat (881), a second sealing ring (883) is embedded in the sealing plug (882), a plurality of springs (884) are fixed at equal intervals on a side wall of the sealing plug (882) close to the fixed seat (881), a plurality of circular holes (885) are opened on a side of the fixed seat (881) close to the sealing plug (882), the springs (884) are arranged inside the circular holes (885) and are fixed to the fixed seat (881); The sealing plug (882) has a convex cross-section, and comprises a sealing block inserted into the interior of the fixing seat (881) and a limiting block arranged outside the fixing seat (881). The cross-sectional diameter of the sealing block is the same as the inner diameter of the fixing seat (881), and the cross-sectional diameter of the limiting block is larger than the inner diameter of the fixing seat (881). The limit block located inside the filter pipe (82) contacts the bottom of the fixing seat (881), the limit block located inside the first curved pipe (83) contacts the side wall of the fixing seat (881) close to the second curved pipe (84), the limit block located at the bottom end of the second curved pipe (84) contacts the bottom of the fixing seat (881), and the limit block located at the top end of the second curved pipe (84) contacts the side wall of the fixing seat (881) close to the vertical pipe (81).

4. The anti-leakage hydraulic cylinder according to claim 1, characterized in that: The outer walls at the top and bottom of the filter pipe (82) are both threadedly connected with threaded sleeves (85), and the two threaded sleeves (85) are respectively threadedly connected to the bottom end of the vertical pipe (81) and the top end of the first curved pipe (83).

5. The anti-leakage hydraulic cylinder according to claim 4, characterized in that: A first sealing ring (86) is embedded in the middle of the inner wall of the threaded sleeve (85).

6. The anti-leakage hydraulic cylinder according to claim 1, characterized in that: A flow rate sensor (89) is provided at the bottom end of the first curved pipe (83); a probe of the flow rate sensor (89) extends into the first curved pipe (83) and is used to monitor the flow rate of the hydraulic oil in the first curved pipe (83); a buzzer (810) is provided on one side of the first oil pipe (5) or the second oil pipe (6); an MCU control chip (811) is provided on the front side of the first oil pipe (5); when the first curved pipe (83) detects that the flow rate of the hydraulic oil is lower than a set value, the MCU control chip (811) controls the buzzer (810) to emit a sound.

7. The anti-leakage hydraulic cylinder according to claim 6, characterized in that: The protection box (7) comprises a box body (71), the buzzer (810) is installed on one side of the top of the box body (71), the MCU control chip (811) is installed on the front side of the box body (71) at the bottom of the first oil pipe (5), the flow rate sensor (89) is located outside the box body (71), and the probe rod of the flow rate sensor (89) penetrates the box body (71) and extends into the inside of the box body (71); The box body (71) covers the outside of the vertical pipe (81), the filter pipe (82), the first curved pipe (83) and the second curved pipe (84).

8. The anti-leakage hydraulic cylinder according to claim 7, characterized in that: The protective box (7) further comprises a through hole (72) provided on one side of the box body (71), a plug plate (73) being inserted into the through hole (72), a handle (74) being fixed to the front side of the plug plate (73), two bolts (75) distributed up and down being provided on one side of the plug plate (73), and the plug plate (73) being fixed to the box body (71) by the bolts (75).

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