Hydraulic oil cylinder body with multiple protection structures

Abstract

The invention relates to the technical field of hydraulic oil cylinders, in particular to a hydraulic oil cylinder body with a multi-protection structure. A connecting assembly is arranged on one side of a hydraulic oil cylinder body and communicates with the hydraulic oil cylinder body, an oil injection device is arranged on one side of the connecting assembly, and the connecting assembly is used for pushing the oil injection device to move; a piston rod surface cleaning device is arranged at the other end of the oil injection device, when the oil injection device moves, the piston rod surface cleaning device is driven to make contact with the piston rod body, the piston rod surface cleaning device scrapes impurity particles on the surface of the piston rod body, and meanwhile the oil injection device injects oil into the piston rod surface cleaning device; the piston rod surface cleaning device conducts oil brushing lubrication on the surface of the piston rod body, and the situation that when the piston rod is collected into the hydraulic cavity again, particle impurities abrade a sealing ring or adhere to the sealing ring to corrode the sealing ring, and consequently the air tightness of the hydraulic oil cylinder body is reduced can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic cylinders, in particular to a hydraulic cylinder body with a multiple protection structure. Background Art

[0002] The hydraulic cylinder is a key component in the hydraulic system, responsible for converting hydraulic energy into mechanical energy to produce linear or rotary motion. It is usually composed of a cylinder body, a piston, a piston rod, a sealing device and accessories. The cylinder body is cylindrical, and the internal volume is connected to the atmosphere. There is a liquid inlet at the top and a liquid outlet at the bottom. The piston is close to the inner wall of the cylinder body to form a closed chamber. When the hydraulic oil enters the cylinder, it pushes the piston outward; when the oil flows back, the piston returns under the action of a spring or a weight to achieve reciprocating motion.

[0003] However, as far as the current traditional hydraulic cylinder body is concerned, the protection effect of the hydraulic cylinder body is poor. The hydraulic cylinder body is easily deformed when it is hit, causing safety accidents and affecting the service life of the device. At the same time, when the hydraulic cylinder is in use, the piston rod is extended and exposed to the air, and foreign particles are easy to adhere to the piston rod. When the piston rod is retracted into the cylinder body, the particulate impurities are easy to cause wear on the sealing ring, or adhere to the sealing ring and cause corrosion to the sealing ring, resulting in reduced air tightness of the hydraulic cylinder.

[0004] The present invention aims to solve the technical problems existing in the prior art, and for this purpose, proposes a hydraulic cylinder body with a multiple protection structure. Summary of the invention

[0005] The object of the present invention is to provide a hydraulic cylinder body with a multiple protection structure to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A hydraulic cylinder body with a multiple protection structure, comprising an anti-collision shell body and a hydraulic cylinder body, wherein the anti-collision shell body is fixedly connected to the hydraulic cylinder body, and the anti-collision shell body is used to reduce the impact of the collision on the hydraulic cylinder body, a piston rod body is arranged inside the hydraulic cylinder body, a sealing device is arranged on one side of the hydraulic cylinder body, and the piston rod body penetrates the sealing device and is in sliding contact with the sealing device; A connecting component is provided on one side of the hydraulic cylinder body, and the connecting component is connected to the hydraulic cylinder body. An oil filling device is provided on one side of the connecting component, and the connecting component is used to push the oil filling device to move. A piston rod surface cleaning device is provided on the other end of the oil filling device. When the oil filling device moves, it drives the piston rod surface cleaning device to contact the piston rod body, and the piston rod surface cleaning device scrapes away foreign particles on the surface of the piston rod body. At the same time, the oil filling device fills oil into the piston rod surface cleaning device, and the piston rod surface cleaning device brushes oil and lubricates the surface of the piston rod body.

[0007] As a further solution of the present invention: the hydraulic cylinder body includes a cylinder body, a hydraulic cavity is opened inside the cylinder body, the piston rod body is located in the hydraulic cavity, an air pressure cavity is opened inside the cylinder body, the air pressure cavity is connected with the hydraulic cavity, a first piston is arranged in the hydraulic cavity, the first piston is used to separate the hydraulic cavity from the air pressure cavity, a conduit is opened inside the cylinder body, the conduit is used to connect the air pressure cavity with the connecting component, and a sealing device is arranged on one side of the cylinder body.

[0008] As a further solution of the present invention: the sealing device includes a cylinder cover, a sealing block is arranged at one end of the cylinder cover, the sealing block is located in the hydraulic cavity, the sealing block is used to seal the hydraulic cavity, a plurality of sealing rings are arranged on the inner surface of the sealing ring, and the sealing ring is in contact with the piston rod body.

[0009] As a further solution of the present invention: the piston rod body includes a piston rod, the piston rod passes through the sealing block and is in sliding contact with the sealing ring, a buffer block is arranged at one end of the piston rod, a second piston is arranged on the cylindrical surface of the piston rod, the second piston is located in the hydraulic cavity and is in sliding contact with the cylinder body.

[0010] As a further solution of the present invention: the connecting assembly includes a connecting block, which is fixedly connected to the anti-collision shell body, a connecting pipe is provided on one side of the connecting block, the connecting pipe extends into the connecting rod, the buffer block is connected to the air pressure chamber through the connecting pipe and the conduit, and two limit blocks are provided on the inner surface of the connecting block, and the limit blocks are used to limit the oil injection device.

[0011] As a further solution of the present invention: the oil filling device includes a first plug block, the first plug block is located between the two limit blocks and is in sliding contact with the inner surface of the connecting block, a through groove is provided inside the first plug block, an oil filling pipe is provided on one side of the first plug block, the connecting block, the through groove and the second plug block are connected, a second plug block is provided inside the oil filling pipe, an oil pushing block is fixedly connected to one side of the second plug block, a refueling hole is provided on one side of the oil filling pipe, a refueling cap is threadedly connected to the refueling hole, and the other end of the oil filling pipe is connected to the piston rod surface cleaning device.

[0012] As a further solution of the present invention: the piston rod surface cleaning device includes an arc block, which is fixedly connected to the oil filling pipe, and oil-absorbing cotton is arranged on one side of the arc block, and the oil-absorbing cotton is in contact with the cylindrical surface of the second piston, and the oil-absorbing cotton is used to apply oil to the cylindrical surface of the second piston, and a connecting groove is opened inside the arc block, and the connecting groove is connected to the oil filling pipe, and a scraper is arranged on one side of the arc block, and the scraper is used to scrape off particulate impurities adhered to the surface of the second piston.

[0013] As a further solution of the present invention: the anti-collision shell body includes a base, the base is fixedly connected to the cylinder body, the base is provided with a plurality of connecting grooves, the base is slidably connected to a plurality of anti-collision plates, the plurality of anti-collision plates are fixedly connected to guide blocks, the plurality of guide blocks are respectively located in the plurality of connecting grooves and are in sliding contact with the base, a shock-absorbing spring is arranged on one side of the anti-collision plate, the other end of the shock-absorbing spring is fixedly connected to the cylinder body, a sleeve is arranged on one side of the anti-collision plate, the sleeve is sleeved on the cylindrical surface of the connecting rod and is in sliding contact with the connecting rod.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When the hydraulic cylinder is in use, the hydraulic chamber is filled with oil, the internal pressure of the hydraulic chamber increases, the first piston is pressed and moves downward to compress the air inside the air pressure chamber, and the gas pushes the oil filling device to move through the air pressure chamber, the conduit and the connecting block. The oil filling device drives the piston rod surface cleaning device to move so that the piston rod surface cleaning device contacts the piston rod, and the particle impurities on the surface of the piston rod can be scraped off by the scraper. At the same time, the gas squeezes the second plug block to move, and the second plug block pushes the oil in the oil filling pipe into the connecting groove. The oil absorbent cotton absorbs the oil, and then the piston rod surface is lubricated by the oil absorbent cotton, so as to avoid the particle impurities from causing wear to the sealing ring when the piston rod is re-entered into the hydraulic chamber, or adhering to the sealing ring to cause corrosion to the sealing ring, resulting in reduced air tightness of the hydraulic cylinder body.

[0015] The device is provided with an anti-collision shell body. When the device is impacted by external force, the anti-collision plate can effectively protect the hydraulic cylinder body. At the same time, a shock-absorbing spring is provided on one side of the anti-collision plate, which can effectively buffer and shock-absorb the impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of a hydraulic cylinder body with multiple protection structures.

[0017] Figure 2 for Figure 1 Front view of the section.

[0018] Figure 3 The present invention is a cross-sectional view of a connecting component in a hydraulic cylinder body with a multiple protection structure.

[0019] Figure 4 The present invention is a structural schematic diagram of an oil filling device in a hydraulic cylinder body with multiple protection structures.

[0020] Figure 5 The present invention is a structural schematic diagram of a piston rod surface cleaning device in a hydraulic cylinder body with multiple protection structures.

[0021] 1-anti-collision housing body, 2-hydraulic cylinder body, 3-connecting assembly, 4-oil filling device, 5-piston rod surface cleaning device, 6-piston rod body, 7-sealing device, 101-base, 102-guide block, 103-connecting groove, 104-shock-absorbing spring, 105-sleeve, 106-anti-collision plate, 201-cylinder body, 202-first piston, 203-hydraulic chamber, 204-conduit, 205-connecting rod, 206-air pressure chamber, 301- Connecting block, 302-connecting pipe, 303-limiting block, 401-first plug block, 402-oil filling pipe, 403-second plug block, 404-oil pushing block, 405-fuel filling cap, 406-fuel filling hole, 407-through groove, 501-arc block, 502-scraper, 503-connecting groove, 504-oil absorbing cotton, 601-shock absorber block, 602-second piston, 603-piston rod, 701-sealing block, 702-sealing ring, 703-cylinder head. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0023] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0024] See also Figure 1-5 A hydraulic cylinder body with a multiple protection structure includes an anti-collision shell body 1 and a hydraulic cylinder body 2, wherein the anti-collision shell body 1 is fixedly connected to the hydraulic cylinder body 2, and the anti-collision shell body 1 is used to reduce the impact of the impact on the hydraulic cylinder body 2, and effectively buffer and shock the impact, a piston rod body 6 is arranged inside the hydraulic cylinder body 2, a sealing device 7 is arranged on one side of the hydraulic cylinder body 2, and the piston rod body 6 penetrates the sealing device 7 and is in sliding contact with the sealing device 7; A connecting component 3 is provided on one side of the hydraulic cylinder body 2, and the connecting component 3 is connected to the hydraulic cylinder body 2. An oil filling device 4 is provided on one side of the connecting component 3, and the connecting component 3 is used to push the oil filling device 4 to move. A piston rod surface cleaning device 5 is provided on the other end of the oil filling device 4. When the oil filling device 4 moves, it drives the piston rod surface cleaning device 5 to contact the piston rod body 6, and the piston rod surface cleaning device 5 scrapes the impurity particles on the surface of the piston rod body 6. At the same time, the oil filling device 4 fills oil into the piston rod surface cleaning device 5, and the piston rod surface cleaning device 5 brushes oil on the surface of the piston rod body 6 to lubricate the surface of the piston rod body 6, which can prevent the granular impurities from wearing the sealing ring 702 when the piston rod 603 is re-entered into the hydraulic chamber 203, or adhering to the sealing ring 702 to corrode the sealing ring 702, resulting in reduced air tightness of the hydraulic cylinder body 2.

[0025] See also Figure 1 and Figure 2 The hydraulic cylinder body 2 includes a cylinder body 201, a hydraulic chamber 203 is provided inside the cylinder body 201, a piston rod body 6 is located in the hydraulic chamber 203, a gas pressure chamber 206 is provided inside the cylinder body 201, the gas pressure chamber 206 is connected with the hydraulic chamber 203, a first piston 202 is provided in the hydraulic chamber 203, the first piston 202 is used to separate the hydraulic chamber 203 from the gas pressure chamber 206, a conduit 204 is provided inside the cylinder body 201, the conduit 204 is used to connect the gas pressure chamber 206 with the connecting component 3, a sealing device 7 is provided on one side of the cylinder body 201, and the hydraulic chamber 203 is filled with oil, so that the pressure inside the hydraulic chamber 203 increases, that is, the hydraulic oil pushes the first piston 202 to move downward under pressure to compress the air inside the gas pressure chamber 206, and at the same time, the hydraulic oil begins to push the piston rod 603 upward through the second piston 602, and when the gas inside the gas pressure chamber 206 is compressed, the air pressure inside the gas pressure chamber 206 increases.

[0026] See also Figure 2 The sealing device 7 includes a cylinder cover 703, a sealing block 701 is arranged at one end of the cylinder cover 703, the sealing block 701 is located in the hydraulic chamber 203, the sealing block 701 is used to seal the hydraulic chamber 203, and a plurality of sealing rings 702 are arranged on the inner surface of the sealing ring 702, and the sealing ring 702 is in contact with the piston rod body 6.

[0027] See also Figure 1 and Figure 2 The piston rod body 6 includes a piston rod 603, which passes through the sealing block 701 and is in sliding contact with the sealing ring 702. A buffer block 601 is provided at one end of the piston rod 603, and a second piston 602 is provided on the cylindrical surface of the piston rod 603. The second piston 602 is located in the hydraulic chamber 203 and is in sliding contact with the cylinder body 201.

[0028] See also Figure 1 , Figure 2 and Figure 3 The connecting assembly 3 includes a connecting block 301, which is fixedly connected to the anti-collision shell body 1. A connecting pipe 302 is provided on one side of the connecting block 301, and the connecting pipe 302 extends into the connecting rod 205. The buffer block 601 is connected to the air pressure chamber 206 through the connecting pipe 302 and the conduit 204. Two limit blocks 303 are provided on the inner surface of the connecting block 301. The limit blocks 303 are used to limit the oil injection device 4. Since the air pressure chamber 206, the conduit 204 and the connecting block 301 are connected, that is, the internal air pressure of the connecting block 301 increases, the gas pushes the first plug 401 to move, and the first plug 401 drives the arc block 501 to move through the oil filling pipe 402, so that the arc block 501 fits with the surface of the piston rod 603. At the same time, since the arc block 501 fits with the surface of the piston rod 603, the piston rod 603 limits the arc block 501 so that it cannot move. At the same time, the connecting block 301 is connected with the inside of the oil filling pipe 402 through the through groove 407. The internal gas of the connecting block 301 pushes the second plug 403 to move. The second plug 403 pushes the oil in the oil filling pipe 402 to move through the oil pushing block 404, so that the oil enters the connecting groove 503 and contacts with the oil absorbing cotton 504.

[0029] See also Figure 1 , Figure 2 and Figure 4 The oil filling device 4 includes a first plug 401, which is located between the two limit blocks 303 and in sliding contact with the inner surface of the connecting block 301. A through groove 407 is provided inside the first plug 401, and an oil filling pipe 402 is provided on one side of the first plug 401. The connecting block 301, the through groove 407 and the second plug 403 are connected. A second plug 403 is provided inside the oil filling pipe 402, and an oil pushing block 404 is fixedly connected to one side of the second plug 403. A refueling hole 406 is provided on one side of the oil filling pipe 402, and a refueling cap 405 is threadedly connected to the refueling hole 406. The other end of the oil filling pipe 402 is connected to the piston rod surface cleaning device 5.

[0030] See also Figure 1 , Figure 2 and Figure 5The piston rod surface cleaning device 5 includes an arc block 501, which is fixedly connected to the oil injection pipe 402. An oil-absorbing cotton 504 is arranged on one side of the arc block 501. The oil-absorbing cotton 504 contacts the cylindrical surface of the second piston 602. The oil-absorbing cotton 504 is used to apply oil to the cylindrical surface of the second piston 602. A connecting groove 503 is opened inside the arc block 501. The connecting groove 503 is connected to the oil injection pipe 402. A scraper 502 is arranged on one side of the arc block 501. The scraper 502 is used to scrape off the granular impurities adhered to the surface of the second piston 602. The arc block 501 drives the scraper 502 and the oil-absorbing cotton 504 to fit the surface of the piston rod 603, that is, the granular impurities on the surface of the piston rod 603 can be scraped off during the movement of the piston rod 603, and the oil-absorbing cotton 504 absorbs oil. At the same time, during the movement of the piston rod 603, the oil-absorbing cotton 504 lubricates the surface of the piston rod 603 during the movement.

[0031] See also Figure 1 and Figure 2 The anti-collision shell body 1 includes a base 101, the base 101 is fixedly connected to the cylinder body 201, the base 101 is provided with a plurality of connection grooves 103, the base 101 is slidably connected with a plurality of anti-collision plates 106, the plurality of anti-collision plates 106 are fixedly connected with guide blocks 102, the plurality of guide blocks 102 are respectively located in the plurality of connection grooves 103 and are in sliding contact with the base 101, a shock absorbing spring 104 is arranged on one side of the anti-collision plate 106, the other end of the shock absorbing spring 104 is fixedly connected to the cylinder body 201, a sleeve 105 is arranged on one side of the anti-collision plate 106, the sleeve 105 is sleeved on the cylindrical surface of the connecting rod 205 and is in sliding contact with the connecting rod 205, when the device is impacted by external force, the anti-collision plate 106 can effectively protect the hydraulic cylinder, and at the same time, a shock absorbing spring 104 is arranged on one side of the anti-collision plate 106, which can effectively buffer and damp the impact.

[0032] The working principle of the present invention is: when the hydraulic cylinder is used, the hydraulic chamber 203 is filled with oil, thereby increasing the internal pressure of the hydraulic chamber 203, that is, the hydraulic oil pushes the first piston 202 to move downward under pressure to compress the air in the air pressure chamber 206, and at the same time, the hydraulic oil begins to push the piston rod 603 upward through the second piston 602. When the gas in the air pressure chamber 206 is compressed, the air pressure in the air pressure chamber 206 increases. Since the air pressure chamber 206, the conduit 204 and the connecting block 301 are connected, that is, the air pressure in the connecting block 301 increases, the gas pushes the first plug 401 to move, and the first plug 401 drives the arc block 501 to move through the oil filling pipe 402, so that the arc block 501 is in contact with the surface of the piston rod 603, and the arc block 501 drives the scraper 502 and the oil-absorbing cotton 504 to fit the surface of the piston rod 603, that is, the particle impurities on the surface of the piston rod 603 can be scraped off during the movement of the piston rod 603. At the same time, since the arc block 501 fits the surface of the piston rod 603, the piston rod 603 limits the arc block 501 so that it cannot move. At the same time, the connecting block 301 is connected to the inside of the oil filling pipe 402 through the through groove 407, and the internal gas of the connecting block 301 pushes the second plug 403 to move. The second plug 403 pushes the oil inside the oil filling pipe 402 to move through the oil pushing block 404, so that the oil enters the connecting groove 503 and contacts the oil absorbing cotton 504, so that the oil absorbing cotton 504 absorbs the oil. At the same time, during the movement of the piston rod 603, the oil absorbing cotton 504 lubricates the surface of the piston rod 603 during the movement. The device is provided with an anti-collision shell body 1. When the device is hit by external force, the anti-collision plate 106 can effectively protect the hydraulic cylinder. At the same time, a shock-absorbing spring 104 is provided on one side of the anti-collision plate 106, which can effectively buffer and shock-absorb the impact.

[0033] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0034] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A hydraulic cylinder body with a multiple protection structure, comprising an anti-collision shell body and a hydraulic cylinder body, characterized in that: The anti-collision shell body is fixedly connected to the hydraulic cylinder body, and the anti-collision shell body is used to reduce the impact of the impact on the hydraulic cylinder body. A piston rod body is arranged inside the hydraulic cylinder body, and a sealing device is arranged on one side of the hydraulic cylinder body. The piston rod body passes through the sealing device and is in sliding contact with the sealing device. A connecting component is provided on one side of the hydraulic cylinder body, and the connecting component is connected to the hydraulic cylinder body. An oil filling device is provided on one side of the connecting component, and the connecting component is used to push the oil filling device to move. A piston rod surface cleaning device is provided on the other end of the oil filling device. When the oil filling device moves, it drives the piston rod surface cleaning device to contact the piston rod body, and the piston rod surface cleaning device scrapes away foreign particles on the surface of the piston rod body. At the same time, the oil filling device fills oil into the piston rod surface cleaning device, and the piston rod surface cleaning device brushes oil and lubricates the surface of the piston rod body.

2. The hydraulic cylinder body with multiple protection structures according to claim 1, characterized in that: The hydraulic cylinder body includes a cylinder body, a hydraulic cavity is provided inside the cylinder body, a piston rod body is located in the hydraulic cavity, an air pressure cavity is provided inside the cylinder body, the air pressure cavity is communicated with the hydraulic cavity, a first piston is provided in the hydraulic cavity, the first piston is used to separate the hydraulic cavity from the air pressure cavity, a conduit is provided inside the cylinder body, the conduit is used to connect the air pressure cavity and the connecting component, a sealing device is provided on one side of the cylinder body, a plurality of connecting rods are provided on the cylindrical surface of the cylinder body, and the connecting rods are connected to the anti-collision shell body.

3. The hydraulic cylinder body with multiple protection structures according to claim 2, characterized in that: The sealing device comprises a cylinder cover, one end of which is provided with a sealing block, which is located in the hydraulic cavity and is used to seal the hydraulic cavity. A plurality of sealing rings are provided on the inner surface of the sealing ring, and the sealing rings are in contact with the piston rod body.

4. The hydraulic cylinder body with a multiple protection structure according to claim 3, characterized in that: The piston rod body comprises a piston rod, the piston rod passes through the sealing block and is in sliding contact with the sealing ring, a buffer block is arranged at one end of the piston rod, a second piston is arranged on the cylindrical surface of the piston rod, the second piston is located in the hydraulic cavity and is in sliding contact with the cylinder body.

5. The hydraulic cylinder body with multiple protection structures according to claim 2, characterized in that: The connecting assembly includes a connecting block, which is fixedly connected to the anti-collision shell body. A connecting pipe is provided on one side of the connecting block, and the connecting pipe extends into the connecting rod. The buffer block is connected to the air pressure chamber through the connecting pipe and the conduit. Two limit blocks are provided on the inner surface of the connecting block, and the limit blocks are used to limit the oil injection device.

6. The hydraulic cylinder body with multiple protection structures according to claim 5, characterized in that: The oil filling device includes a first plug block, which is located between the two limit blocks and in sliding contact with the inner surface of the connecting block. A through groove is provided inside the first plug block, and an oil filling pipe is provided on one side of the first plug block. The connecting block, the through groove and the second plug block are connected. A second plug block is provided inside the oil filling pipe, and an oil pushing block is fixedly connected to one side of the second plug block. A refueling hole is provided on one side of the oil filling pipe, and a refueling cap is threadedly connected to the refueling hole. The other end of the oil filling pipe is connected to the piston rod surface cleaning device.

7. The hydraulic cylinder body with multiple protection structures according to claim 6, characterized in that: The piston rod surface cleaning device includes an arc block, which is fixedly connected to the oil filling pipe. One side of the arc block is provided with oil-absorbing cotton, which is in contact with the cylindrical surface of the second piston and is used to apply oil to the cylindrical surface of the second piston. A connecting groove is provided inside the arc block, which is connected to the oil filling pipe. A scraper is provided on one side of the arc block, which is used to scrape off particulate impurities adhered to the surface of the second piston.

8. The hydraulic cylinder body with multiple protection structures according to claim 2, characterized in that: The anti-collision shell body includes a base, the base is fixedly connected to the cylinder body, the base is provided with a plurality of connection grooves, the base is slidably connected to a plurality of anti-collision plates, the plurality of anti-collision plates are fixedly connected to guide blocks, the plurality of guide blocks are respectively located in the plurality of connection grooves and in sliding contact with the base, a shock-absorbing spring is arranged on one side of the anti-collision plate, the other end of the shock-absorbing spring is fixedly connected to the cylinder body, a sleeve is arranged on one side of the anti-collision plate, the sleeve is sleeved on the cylindrical surface of the connecting rod and in sliding contact with the connecting rod.

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