High-output-torque and high-sealing-performance swing hydraulic cylinder for wet spraying machine

Abstract

The high-output-torque and high-sealing-performance swing hydraulic cylinder for the wet spraying machine is provided with an outer shell, a left fixed supporting sleeve and a right fixed supporting sleeve are fixedly arranged on the outer circumference of the left side and the outer circumference of the right side of the outer shell respectively, and a plurality of left hydraulic oil holes and a plurality of right hydraulic oil holes are formed in the left side and the right side of the outer shell respectively. The multiple left hydraulic oil holes and the multiple right hydraulic oil holes penetrate into the outer shell. The swing hydraulic cylinder solves the technical problems that in an existing swing hydraulic cylinder, due to the fact that the transmission amount of hydraulic oil is small, the pressure in the cylinder is low, when a wet spraying machine sprays high-density materials such as concrete and mortar, the rotating precision of a main shaft in the swing hydraulic cylinder is obviously reduced, and the requirement for long-time precise rotating spraying operation of the wet spraying machine is difficult to meet. The swing hydraulic cylinder can be widely applied to swing hydraulic cylinders.

Description

Technical Field

[0001] The utility model relates to a swing hydraulic cylinder, in particular to a swing hydraulic cylinder with high output torque and high sealing performance for a wet shotcreting machine. Background Art

[0002] A wet shotcreting machine is a special equipment for spraying concrete, mortar or other liquid materials. It usually consists of a spray gun and a pressure pump. The liquid material is transported from the pressure pump to the spray gun and then sprayed onto the surface to be coated through air pressure.

[0003] In order to realize the multi-angle spraying operation of the wet shotcreting machine, a swing hydraulic cylinder is usually installed at the rear end of the spray gun. Through the swing operation of the swing hydraulic cylinder, the forward and reverse rotation of the spray gun is controlled to realize the multi-angle rotary spraying operation.

[0004] However, for the existing swing hydraulic cylinder, due to the small amount of hydraulic oil transmission, the pressure in the cylinder is relatively low. When the wet shotcreting machine sprays high-density materials such as concrete and mortar, the rotation accuracy of the main shaft inside the swing hydraulic cylinder is significantly reduced, making it difficult to meet the long-term accurate rotary spraying operation of the wet shotcreting machine. Content of the Utility Model

[0005] In view of the above technical problems, the utility model provides a swing hydraulic cylinder with high output torque and high sealing performance for a wet shotcreting machine. By arranging a plurality of oil holes on the outer shell, large-flow transmission of hydraulic oil is realized, the pressure in the cylinder is sufficient, and the rotation accuracy of the main shaft inside the swing hydraulic cylinder is significantly improved, which can meet the use of the wet shotcreting machine for long-term spraying of high-density materials such as concrete and mortar.

[0006] Therefore, the technical solution of the utility model is a swing hydraulic cylinder with high output torque and high sealing performance for a wet shotcreting machine, which is provided with an outer shell body. On the outer circumferences of the left and right sides of the outer shell body, a left fixed support sleeve and a right fixed support sleeve are respectively fixedly arranged;

[0007] The left fixed support sleeve includes an inner section of the left fixed support sleeve and an outer section of the left fixed support sleeve. The inner section of the left fixed support sleeve is fixedly connected to the outer circumference of the leftmost side of the outer shell body, and the outer section of the left fixed support sleeve is located outside the leftmost end of the outer shell body;

[0008] The right fixed support sleeve includes an inner section of the right fixed support sleeve and an outer section of the right fixed support sleeve. The inner section of the right fixed support sleeve is fixedly connected to the outer circumference of the rightmost side of the outer shell body, and the outer section of the right fixed support sleeve is located outside the rightmost end of the outer shell body;

[0009] On the left and right sides of the outer shell body, a plurality of left hydraulic oil holes and a plurality of right hydraulic oil holes are respectively arranged, and the plurality of left hydraulic oil holes and the plurality of right hydraulic oil holes respectively penetrate to the inside of the outer shell body;

[0010] Inside the outer housing, there is a main shaft which includes a first shaft section, a second shaft section, and a third shaft section. The first shaft section is located on the left side of the main shaft, the second shaft section is located in the middle of the main shaft, and the third shaft section is located on the right side of the main shaft;

[0011] On the outer circumference of the first shaft section, there is a left rotating shaft sleeve. There is a sealed and fixed connection between the inner circumference of the left rotating shaft sleeve and the outer circumference of the first shaft section. The left rotating shaft sleeve includes an outer section of the left rotating shaft sleeve and an inner section of the left rotating shaft sleeve. The outer circumferences of the outer section of the left rotating shaft sleeve and the inner section of the left rotating shaft sleeve form a stepped structure. The outer section of the left rotating shaft sleeve is located at the inner circumference position of the outer section of the left fixed support sleeve, and the inner section of the left rotating shaft sleeve is located inside the outer housing;

[0012] On the outer circumference of the inner section of the left rotating shaft sleeve, there are multiple grooves. Inside the multiple grooves, there are respectively an oil seal ring and a wear-resistant support pad. There is a rotating seal connection between the inner section of the left rotating shaft sleeve and the right inner surface of the outer housing through the oil seal ring and the wear-resistant support pad;

[0013] There is a wear-resistant support pad between the longitudinal stepped surface of the outer section of the left rotating shaft sleeve and the leftmost end face of the outer housing. Rotating support is achieved between the longitudinal stepped surface of the outer section of the left rotating shaft sleeve and the leftmost end face of the outer housing through the wear-resistant support pad;

[0014] On the outer circumference of the third shaft section, there is a right rotating shaft sleeve. The right rotating shaft sleeve includes an outer section of the right rotating shaft sleeve and an inner section of the right rotating shaft sleeve. There is a sealed and fixed connection between the inner circumference of the outer section of the right rotating shaft sleeve and the outer circumference of the third shaft section. The outer circumferences of the outer section of the right rotating shaft sleeve and the inner section of the right rotating shaft sleeve form a stepped structure. The outer section of the right rotating shaft sleeve is located at the inner circumference position of the outer section of the right fixed support sleeve, and the inner section of the right rotating shaft sleeve is located inside the outer housing;

[0015] On the outer circumference of the inner section of the right rotating shaft sleeve, there are multiple grooves. Inside the multiple grooves, there are respectively an oil seal ring and a wear-resistant support pad. There is a rotating seal connection between the inner section of the right rotating shaft sleeve and the right inner surface of the outer housing through the oil seal ring and the wear-resistant support pad;

[0016] There is a wear-resistant support pad between the longitudinal stepped surface of the outer section of the right rotating shaft sleeve and the rightmost end face of the outer housing. Rotating support is achieved between the longitudinal stepped surface of the outer section of the right rotating shaft sleeve and the rightmost end face of the outer housing through the wear-resistant support pad;

[0017] An oil cavity is formed among the outer housing, the main shaft, the left rotating shaft sleeve, and the right rotating shaft sleeve;

[0018] The outer circumference of the second shaft section is provided with a piston sleeve, which includes a left rotating seal section and a right rotating connection section of the piston sleeve. The left rotating seal section of the piston sleeve is located at the left section of the second shaft section, and the right rotating connection section of the piston sleeve is located at the right section of the second shaft section. The inner circumference of the left rotating seal section of the piston sleeve is provided with a plurality of grooves, and an oil seal ring and a wear-resistant support pad are respectively arranged in the plurality of grooves. A rotating seal connection is provided between the inner circumference of the left rotating seal section of the piston sleeve and the outer circumference of the left section position of the second shaft section;

[0019] The outer circumference of the left rotating seal section of the piston sleeve is provided with a groove, and an oil seal ring is arranged in the groove. A rotating seal connection is provided between the outer circumference of the left rotating seal section of the piston sleeve and the inner circumference of the housing;

[0020] The left rotating seal section of the piston sleeve divides the oil chamber into a left oil chamber and a right oil chamber. The left oil chamber is communicated with the left hydraulic oil hole, and the right oil chamber is communicated with the right hydraulic oil hole;

[0021] The inner circumference of the right rotating connection section of the piston sleeve is meshed and rotatably connected with the outer circumference of the right section part of the second shaft section. An internal gear sleeve is provided between the outer circumference of the right rotating connection section of the piston sleeve and the inner circumference of the housing. A meshing and rotating connection is provided between the outer circumference of the right rotating connection section of the piston sleeve and the inner circumference of the internal gear sleeve, and a fixed connection is provided between the outer circumference of the internal gear sleeve and the inner circumference of the housing.

[0022] Preferably, the outer circumference of the outer section of the left rotating shaft sleeve is provided with a groove, and a dust-proof seal ring is arranged in the groove. A rotating seal is achieved between the outer circumference of the outer section of the left rotating shaft sleeve and the inner circumference of the outer section of the left fixed support sleeve through the dust-proof seal ring;

[0023] The outer circumference of the inner section of the right rotating shaft sleeve is provided with a groove, and a dust-proof seal ring is arranged in the groove. A rotating seal is achieved between the outer circumference of the inner section of the right rotating shaft sleeve and the outer section of the right fixed support sleeve through the dust-proof seal ring.

[0024] Preferably, the number of the left hydraulic oil holes is two, namely a left first oil hole and a left second oil hole, and the left first oil hole and the left second oil hole are respectively communicated with the left oil chamber;

[0025] The number of the right hydraulic oil holes is two, namely a right first oil hole and a right second oil hole, and the right first oil hole and the right second oil hole are respectively communicated with the right oil chamber.

[0026] Preferably, the number of the grooves on the outer circumference of the inner section of the left rotating shaft sleeve is two, and the two grooves are sequentially arranged along the axial direction on the outer circumference of the inner section of the left rotating shaft sleeve. An oil seal ring is arranged in the outer groove, and a wear-resistant support pad is arranged in the inner groove;

[0027] The number of grooves on the outer circumference of the inner section of the right rotating shaft sleeve is three. The three grooves are arranged in sequence along the axial direction on the outer circumference of the inner section of the right rotating shaft sleeve. Oil seals are respectively arranged in the outer and middle grooves, and a wear-resistant support pad is arranged in the inner groove.

[0028] Preferably, the number of grooves on the inner circumference of the left rotating seal section of the piston sleeve is three. The three grooves are arranged in sequence along the axial direction on the inner circumference of the left rotating seal section of the piston sleeve. Oil seals are arranged in the grooves on both sides, and a wear-resistant support pad is arranged in the middle groove.

[0029] Preferably, the outer circumference of the internal gear sleeve and the inner circumference of the housing are fixed by welding, and the welding points are respectively located at both axial sides of the internal gear sleeve.

[0030] Preferably, the thickness of the oil seal on the outer circumference of the inner section of the left rotating shaft sleeve is 15mm ± 2mm;

[0031] The thickness of the oil seal in the middle groove on the outer circumference of the inner section of the right rotating shaft sleeve is 15mm ± 2mm;

[0032] The width of the wear-resistant support pad on the outer circumference of the inner section of the right rotating shaft sleeve is 55mm ± 5mm.

[0033] The beneficial effects of the present utility model are as follows:

[0034] 1. For this swing hydraulic cylinder, by respectively arranging two groups of left oil holes and right oil holes on the housing, the oil intake of the swing cylinder can be increased, ensuring sufficient pressure in the cylinder, thereby improving the rotation accuracy of the swing cylinder and the torque of the swing cylinder rotation. It can meet the use when the wet spraying machine sprays high-density materials such as concrete and mortar for a long time. At the same time, when the wet spraying machine sprays high-density materials for a long time, it can reduce the influence degree of the shaking impact on the swing cylinder, and further improve the service life of the swing cylinder.

[0035] 2. By thickening the thickness of the oil seals on the outer circumferences of the inner sections of the left rotating shaft sleeve and the right rotating shaft sleeve, it is further ensured that when high-pressure transmission occurs in the cylinder, the oil in the cylinder will not leak outwards.

[0036] 3. Since the main connection positions of this swing cylinder and the wet spraying machine are located on the right fixed support sleeve and the right rotating shaft sleeve, it can be seen that the right side of the swing cylinder is the main load-bearing position. Therefore, there are higher requirements for the rotational stability of the right side of the swing cylinder. By widening the width of the wear-resistant support pad on the outer circumference of the inner section of the right rotating shaft sleeve, it can ensure that when the main shaft and the right rotating shaft sleeve rotate synchronously, there is sufficient supporting force between the inner section of the right rotating shaft sleeve and the housing, so as to ensure the smoothness of the long-term rotation of the main shaft and the right rotating shaft sleeve and the accuracy of swinging, thereby realizing the long-term stable operation of the swing cylinder. Brief Description of the Drawings

[0037] Figure 1 is a perspective view of the present utility model;

[0038] Figure 2 is another perspective view of the present utility model;

[0039] Figure 3 is the front view of the present utility model;

[0040] Figure 4 is the present utility model Figure 3 sectional view A - A in;

[0041] Figure 5 is the present utility model Figure 4 enlarged view at B in;

[0042] Figure 6 is the present utility model Figure 4 enlarged view at C in;

[0043] Figure 7 is the present utility model Figure 4 enlarged view at D in.

[0044] Explanation of the symbols in the drawings:

[0045] . Outer housing; 2. Left fixed support sleeve; 201. Inner section of the left fixed support sleeve; 202. Outer section of the left fixed support sleeve; 3. Right fixed support sleeve; 301. Inner section of the right fixed support sleeve; 302. Outer section of the right fixed support sleeve; 4. Left rotary shaft sleeve; 401. Outer section of the left rotary shaft sleeve; 402. Inner section of the left rotary shaft sleeve; 5. Right rotary shaft sleeve; 501. Outer section of the right rotary shaft sleeve; 502. Inner section of the right rotary shaft sleeve; 6. Main shaft; 601. First shaft section; 602. Second shaft section; 603. Third shaft section; 7. Left first oil hole; 8. Right first oil hole; 9. Left second oil hole; 10. Right second oil hole; 11. Oil cavity; 1101. Left oil cavity; 1102. Right oil cavity; 12. Piston sleeve; 1201. Left rotary sealing section of the piston sleeve; 1202. Right rotary connection section of the piston sleeve; 13. Inner gear sleeve; 14. Wear-resistant support pad; 15. Dust-proof sealing ring; 16. Oil seal ring; 17. Mounting hole. Detailed Description of the Preferred Embodiment

[0046] The following further describes the present utility model in conjunction with embodiments.

[0047] Through Figures 1-7It can be seen that the swing hydraulic cylinder of the wet shotcreting machine with high output torque and high sealing performance is provided with a housing 1. On the outer circumferences of the left and right sides of the housing 1, a left fixed support sleeve 2 and a right fixed support sleeve 3 are respectively fixedly provided. The left fixed support sleeve 2 and the right fixed support sleeve 3 can increase the rigidity of the housing 1, increase the anti-twisting strength of the housing 1, and avoid the situation that the housing 1 is distorted and deformed due to external force impact during the long-term operation of the swing cylinder.

[0048] The left fixed support sleeve 2 includes an inner section 201 of the left fixed support sleeve and an outer section 202 of the left fixed support sleeve. The inner section 201 of the left fixed support sleeve is fixedly connected to the outer circumference of the leftmost side of the housing 1. The outer section 202 of the left fixed support sleeve is located outside the leftmost end of the housing 1. The right fixed support sleeve 3 includes an inner section 301 of the right fixed support sleeve and an outer section 302 of the right fixed support sleeve. The inner section 301 of the right fixed support sleeve is fixedly connected to the outer circumference of the rightmost side of the housing 1. The outer section 302 of the right fixed support sleeve is located outside the rightmost end of the housing 1.

[0049] On the left and right sides of the housing 1, a plurality of left hydraulic oil holes and a plurality of right hydraulic oil holes are respectively provided. The plurality of left hydraulic oil holes and the plurality of right hydraulic oil holes respectively penetrate to the inside of the housing 1. The transmission of hydraulic oil is realized through the left hydraulic oil holes and the right hydraulic oil holes, driving the main shaft of the swing cylinder to swing and operate.

[0050] A main shaft 6 is provided inside the housing 1. The main shaft 6 includes a first shaft section 601, a second shaft section 602, and a third shaft section 603. The first shaft section 601 is located on the left side of the main shaft 6. The second shaft section 602 is located in the middle of the main shaft 6. The third shaft section 603 is located on the right side of the main shaft 6.

[0051] On the outer circumference of the first shaft section 601, a left rotating shaft sleeve 4 is provided. A sealed fixed connection is formed between the inner circumference of the left rotating shaft sleeve 4 and the outer circumference of the first shaft section 601. The left rotating shaft sleeve 4 includes an outer section 401 of the left rotating shaft sleeve and an inner section 402 of the left rotating shaft sleeve. A stepped structure is formed on the outer circumferences of the outer section 401 of the left rotating shaft sleeve and the inner section 402 of the left rotating shaft sleeve. The outer section 401 of the left rotating shaft sleeve is located at the inner circumference position of the outer section 202 of the left fixed support sleeve, and a rotating seal connection is formed with the inner circumference of the outer section 202 of the left fixed support sleeve. The inner section 402 of the left rotating shaft sleeve is located inside the housing 1, and a rotating seal connection is formed with the inner circumference of the housing 1.

[0052] The outer circumference of the inner section 402 of the left rotating shaft sleeve is provided with a plurality of grooves, and an oil seal ring 16 and a wear-resistant support pad 14 are respectively arranged in the plurality of grooves. The inner section 402 of the left rotating shaft sleeve and the right inner surface of the outer housing 1 are rotationally and sealingly connected through the oil seal ring 16 and the wear-resistant support pad 14. A wear-resistant support pad 14 is arranged between the longitudinal step surface of the outer section 401 of the left rotating shaft sleeve and the leftmost end surface of the outer housing 1, and rotational support is achieved between the longitudinal step surface of the outer section 401 of the left rotating shaft sleeve and the leftmost end surface of the outer housing 1 through the wear-resistant support pad 14.

[0053] The outer circumference of the third shaft section 603 is provided with a right rotating shaft sleeve 5. The right rotating shaft sleeve 5 includes an outer section 501 of the right rotating shaft sleeve and an inner section 502 of the right rotating shaft sleeve. A sealed and fixed connection is formed between the inner circumference of the outer section 501 of the right rotating shaft sleeve and the outer circumference of the third shaft section 603. The outer circumferences of the outer section 501 of the right rotating shaft sleeve and the inner section 502 of the right rotating shaft sleeve form a stepped structure. The outer section 501 of the right rotating shaft sleeve is located at the inner circumference position of the outer section 302 of the right fixed support sleeve, and the inner section 502 of the right rotating shaft sleeve is located inside the outer housing 1;

[0054] The outer circumference of the inner section 502 of the right rotating shaft sleeve is provided with a plurality of grooves, and an oil seal ring 16 and a wear-resistant support pad 14 are respectively arranged in the plurality of grooves. The inner section 502 of the right rotating shaft sleeve and the right inner surface of the outer housing 1 are rotationally and sealingly connected through the oil seal ring 16 and the wear-resistant support pad 14;

[0055] A wear-resistant support pad 14 is arranged between the longitudinal step surface of the outer section 501 of the right rotating shaft sleeve and the rightmost end surface of the outer housing 1, and rotational support is achieved between the longitudinal step surface of the outer section 501 of the right rotating shaft sleeve and the rightmost end surface of the outer housing 1 through the wear-resistant support pad 14;

[0056] By providing the oil seal ring 16, it is possible to prevent the oil inside the outer housing 1 from leaking outwards. The wear-resistant support pad 14 is made of materials such as PTFE + copper powder, phenolic cloth laminate, wood tar, and nylon, which have high wear resistance, high support force, and high guiding stability. By providing the wear-resistant support pad 14, the smoothness of the relative rotation between the left rotating shaft sleeve 4 and the right rotating shaft sleeve 5 and the outer housing 1 can be improved, and direct friction between the left rotating shaft sleeve 4 and the right rotating shaft sleeve 5 and the outer housing 1 can be avoided, resulting in knock and wear on the left rotating shaft sleeve 4, the right rotating shaft sleeve 5, or the outer housing 1 and reducing the service life.

[0057] Moreover, the wear-resistant support pad 14 also has good heat conduction and lubrication effects. It can not only reduce the heat generated by the friction between adjacent components and extend the service life of the swing cylinder, but also reduce the friction force between adjacent components during rotation, further ensuring the smoothness of the rotation of the left rotating shaft sleeve 4, the right rotating shaft sleeve 5, and the outer housing 1. Moreover, it can also reduce the noise during the operation of the swing cylinder.

[0058] An oil chamber 11 is formed among the outer housing 1, the main shaft 6, the left rotary shaft sleeve 4, and the right rotary shaft sleeve 5, and hydraulic oil is used for transmission within the oil chamber 11.

[0059] A piston sleeve 12 is provided on the outer circumference of the second shaft segment 602. The piston sleeve 12 includes a left rotary sealing segment 1201 of the piston sleeve and a right rotary connecting segment 1202 of the piston sleeve. The left rotary sealing segment 1201 of the piston sleeve is located at the left segment position of the second shaft segment 602, and the right rotary connecting segment 1202 of the piston sleeve is located at the right segment position of the second shaft segment 602. A plurality of grooves are provided on the inner circumference of the left rotary sealing segment 1201 of the piston sleeve, and an oil seal ring 16 and a wear-resistant support pad 14 are respectively provided in the plurality of grooves. A rotary sealing connection is formed between the inner circumference of the left rotary sealing segment 1201 of the piston sleeve and the outer circumference of the left segment position of the second shaft segment 602.

[0060] A groove is provided on the outer circumference of the left rotary sealing segment 1201 of the piston sleeve, and an oil seal ring 16 is provided in the groove. A rotary sealing connection is formed between the outer circumference of the left rotary sealing segment 1201 of the piston sleeve and the inner circumference of the outer housing 1.

[0061] The left rotary sealing segment 1201 of the piston sleeve divides the oil chamber 11 into a left oil chamber 1101 and a right oil chamber 1102. The left oil chamber 1101 is communicated with the left hydraulic oil hole, and the right oil chamber 1102 is communicated with the right hydraulic oil hole.

[0062] The inner circumference of the right rotary connecting segment 1202 of the piston sleeve is in meshing rotary connection with the outer circumference of the right segment part of the second shaft segment 602. An internal gear sleeve 13 is provided between the outer circumference of the right rotary connecting segment 1202 of the piston sleeve and the inner circumference of the outer housing 1. A meshing rotary connection is formed between the outer circumference of the right rotary connecting segment 1202 of the piston sleeve and the inner circumference of the internal gear sleeve 13, and a fixed connection is formed between the outer circumference of the internal gear sleeve 13 and the inner circumference of the outer housing 1.

[0063] When the oscillating cylinder operates, when the hydraulic oil enters the left oil chamber 1101 from the left hydraulic oil hole, the hydraulic oil pushes the piston sleeve 12. Under the mutual meshing action of the internal gear sleeve 13, the piston sleeve 12 rotates and translates to the right. While the piston sleeve 12 rotates and translates to the right, under the mutual meshing action between the piston sleeve 12 and the main shaft 6, the main shaft 6 is driven to rotate forward. While the main shaft 6 rotates forward, the spray gun is driven to rotate forward synchronously, realizing forward precise rotary spraying.

[0064] When the hydraulic oil enters the right oil cavity 1102 from the right hydraulic oil hole, the hydraulic oil pushes the piston sleeve 12. Under the meshing action of the inner gear sleeve 13, the piston sleeve 12 rotates and translates to the left. While the piston sleeve 12 rotates and translates to the left, under the meshing action between the piston sleeve 12 and the main shaft 6, the main shaft 6 is driven to rotate reversely. While the main shaft 6 rotates reversely, the spray gun is driven to rotate synchronously in the reverse direction, realizing reverse precise rotary spraying.

[0065] The outer circumference of the outer section 401 of the left rotary shaft sleeve is provided with a groove, and a dust-proof sealing ring 15 is arranged in the groove. Rotational sealing is achieved between the outer circumference of the outer section 401 of the left rotary shaft sleeve and the inner circumference of the outer section 202 of the left fixed support sleeve through the dust-proof sealing ring 15. The outer circumference of the inner section 502 of the right rotary shaft sleeve is provided with a groove, and a dust-proof sealing ring 15 is arranged in the groove. Rotational sealing is achieved between the outer circumference of the inner section 502 of the right rotary shaft sleeve and the outer section 302 of the right fixed support sleeve through the dust-proof sealing ring 15.

[0066] The dust-proof sealing ring 15 can prevent impurities such as dust, particles, and foreign objects in the external environment from entering the inside of the swing cylinder, causing problems such as oil circuit blockage, damage to the meshing thread teeth, and increased operating noise, ensure the stability of the swing cylinder operation, and increase the service life of the internal components of the swing cylinder.

[0067] The number of left hydraulic oil holes is two, namely the left first oil hole 7 and the left second oil hole 9. The left first oil hole 7 and the left second oil hole 9 are respectively communicated with the left oil cavity 1101. The number of right hydraulic oil holes is two, namely the right first oil hole 8 and the right second oil hole 10. The right first oil hole 8 and the right second oil hole 10 are respectively communicated with the right oil cavity 1102.

[0068] By respectively arranging two groups of left oil holes and right oil holes, the oil intake of the swing cylinder can be increased, ensuring sufficient pressure in the cylinder, thereby improving the rotation accuracy of the swing cylinder and the torque of the swing cylinder rotation, being able to meet the use when the wet shotcreting machine sprays high-density materials such as concrete and mortar for a long time. At the same time, when the wet shotcreting machine sprays high-density materials for a long time, the influence degree of the shaking impact on the swing cylinder can be reduced, and the service life of the swing cylinder is further improved.

[0069] The number of grooves on the outer circumference of the inner section 402 of the left rotary shaft sleeve is two, and the two grooves are sequentially arranged along the axial direction on the outer circumference of the inner section 402 of the left rotary shaft sleeve. An oil seal ring 16 is arranged in the outer groove, and a wear-resistant support pad 14 is arranged in the inner groove.

[0070] The oil seal ring 16 can prevent the oil in the cylinder from leaking to the outside. Moreover, by arranging the oil seal ring 16 at the outer position, when a small amount of dust enters due to the damage of the dust seal ring 15, the oil seal ring 16 can timely block the entry of external dust powder, preventing the dust powder from wearing the wear-resistant support pad 14 inside the oil seal ring 16. Since the wear-resistant support pad 14 plays a major role in the rotational support when the main shaft of the swing cylinder rotates, ensuring the smooth rotation of the main shaft. Therefore, arranging the wear-resistant support pad 14 inside the oil seal ring 16 can provide good protection for the wear-resistant support pad 14, thus ensuring the long-term smooth operation of the swing cylinder.

[0071] The number of grooves on the outer circumference of the inner section 502 of the right rotating shaft sleeve is three. The three grooves are arranged in sequence along the axial direction on the outer circumference of the inner section 502 of the right rotating shaft sleeve. Oil seal rings 16 are respectively arranged in the outer and middle grooves, and a wear-resistant support pad 14 is arranged in the inner groove. The positions of the oil seal ring 16 and the wear-resistant support pad 14 on this side have the same functions as described above.

[0072] The number of grooves on the inner circumference of the left rotating seal section 1201 of the piston sleeve is three. The three grooves are arranged in sequence along the axial direction on the inner circumference of the left rotating seal section 1201 of the piston sleeve. Oil seal rings 16 are arranged in the two side grooves, and a wear-resistant support pad 14 is arranged in the middle groove.

[0073] By arranging the oil seal rings 16 at both sides and the wear-resistant support pads 14 in the middle, on the one hand, it can prevent the hydraulic oil in the left oil chamber 1101 and the right oil chamber 1102 from mixing with each other, resulting in the problem of pressure relief in the cylinder, which directly affects the swing amplitude and torque of the main shaft 6. On the other hand, it can provide good protection for the wear-resistant support pads 14, ensuring the smoothness of the left and right rotation and translation of the piston sleeve 12.

[0074] The outer circumference of the internal gear sleeve 13 and the inner circumference of the outer housing 1 are fixed by welding. The welding points are respectively located on both axial sides of the internal gear sleeve 13. Since a plurality of left hydraulic oil holes and right hydraulic oil holes are respectively arranged and the pressure in the cylinder is relatively high, fixing the outer circumference of the internal gear sleeve 13 and the inner circumference of the outer housing 1 by welding can increase the fixing firmness between the internal gear sleeve 13 and the outer housing 1, thus ensuring that the piston sleeve 12 and the main shaft 6 can rotate smoothly for a long time.

[0075] The thickness of the oil seal ring 16 on the outer circumference of the inner section 402 of the left rotating shaft sleeve is 15 mm ± 2 mm, and the thickness of the oil seal ring 16 in the middle groove on the outer circumference of the inner section 502 of the right rotating shaft sleeve is 15 mm ± 2 mm. Since multiple left and right hydraulic oil holes are respectively provided, the oil intake in the cylinder is large and the oil pressure is high. Therefore, higher sealing requirements are imposed on the connection between the inner sections of the left and right rotating shaft sleeves and the outer housing 1. Thus, the oil seal ring 16 at this position is thickened to prevent excessive pressure in the cylinder and oil leakage from this position.

[0076] The width of the wear-resistant support pad 14 on the outer circumference of the inner section 502 of the right rotating shaft sleeve is 55 mm ± 5 mm.

[0077] Since the main connection position between this swing cylinder and the wet shotcreting machine is located on the right fixed support sleeve 3 and the right rotating shaft sleeve 5, it can be seen that the right side of the swing cylinder is the main load-bearing position. Therefore, higher requirements are imposed on the rotational stability of the right side of the swing cylinder. Widening the width of the wear-resistant support pad 14 on the outer circumference of the inner section 502 of the right rotating shaft sleeve can ensure that when the main shaft 6 and the right rotating shaft sleeve 5 rotate synchronously, there is sufficient supporting force between the inner section 502 of the right rotating shaft sleeve and the outer housing 1, thereby ensuring the smoothness of the long-term rotation of the main shaft 6 and the right rotating shaft sleeve 5 and the accuracy of the swing, so as to achieve the long-term stable operation of the swing cylinder.

[0078] Installation holes 17 are provided along the circumferential direction on the right fixed support sleeve 3. Through the installation holes 17 on the right fixed support sleeve 3, a fixed connection is achieved between the robotic arm of the wet shotcreting machine and this swing cylinder. Installation holes 17 are provided along the circumferential direction on the outer end face of the right rotating shaft sleeve 5. Through the installation holes 17 on the outer end face of the right rotating shaft sleeve 5, a fixed connection is achieved between the main shaft of this swing cylinder and the spray gun of the wet shotcreting machine. The rotation of the main shaft drives the spray gun to achieve precise rotary spraying.

[0079] However, the above are only specific embodiments of the present utility model, and the scope of implementation of the present utility model cannot be limited thereby. Therefore, the replacement of equivalent components, or equivalent changes and modifications made in accordance with the scope of patent protection of the present utility model, should still fall within the scope covered by the claims of the present utility model.

Claims

1. A swinging hydraulic cylinder with high output torque and high sealing performance for a wet shotcreting machine, characterized in that: There is a housing body, and a left fixed support sleeve and a right fixed support sleeve are respectively fixedly arranged on the outer circumferences of the left and right sides of the housing body; The left fixed support sleeve includes an inner section of the left fixed support sleeve and an outer section of the left fixed support sleeve. The inner section of the left fixed support sleeve is fixedly connected to the outer circumference of the leftmost side of the housing body, and the outer section of the left fixed support sleeve is located outside the leftmost end of the housing body; The right fixed support sleeve includes an inner section of the right fixed support sleeve and an outer section of the right fixed support sleeve. The inner section of the right fixed support sleeve is fixedly connected to the outer circumference of the rightmost side of the housing body, and the outer section of the right fixed support sleeve is located outside the rightmost end of the housing body; A plurality of left hydraulic oil holes and a plurality of right hydraulic oil holes are respectively arranged on the left and right sides of the housing body, and the plurality of left hydraulic oil holes and the plurality of right hydraulic oil holes respectively penetrate through to the inside of the housing body; A main shaft is arranged inside the housing body. The main shaft includes a first shaft section, a second shaft section, and a third shaft section. The first shaft section is located on the left side of the main shaft, the second shaft section is located in the middle of the main shaft, and the third shaft section is located on the right side of the main shaft; A left rotating shaft sleeve is arranged on the outer circumference of the first shaft section. A sealed fixed connection is formed between the inner circumference of the left rotating shaft sleeve and the outer circumference of the first shaft section. The left rotating shaft sleeve includes an outer section of the left rotating shaft sleeve and an inner section of the left rotating shaft sleeve. The outer circumferences of the outer section of the left rotating shaft sleeve and the inner section of the left rotating shaft sleeve form a stepped structure. The outer section of the left rotating shaft sleeve is located at the inner circumference position of the outer section of the left fixed support sleeve, and the inner section of the left rotating shaft sleeve is located inside the housing body; A plurality of grooves are arranged on the outer circumference of the inner section of the left rotating shaft sleeve. An oil seal ring and a wear-resistant support pad are respectively arranged in the plurality of grooves. A rotating seal connection is formed between the inner section of the left rotating shaft sleeve and the right inner surface of the housing body through the oil seal ring and the wear-resistant support pad; A wear-resistant support pad is arranged between the longitudinal stepped surface of the outer section of the left rotating shaft sleeve and the leftmost end face of the housing body. A rotating support is realized between the longitudinal stepped surface of the outer section of the left rotating shaft sleeve and the leftmost end face of the housing body through the wear-resistant support pad; A right rotating shaft sleeve is arranged on the outer circumference of the third shaft section. The right rotating shaft sleeve includes an outer section of the right rotating shaft sleeve and an inner section of the right rotating shaft sleeve. A sealed fixed connection is formed between the inner circumference of the outer section of the right rotating shaft sleeve and the outer circumference of the third shaft section. The outer circumferences of the outer section of the right rotating shaft sleeve and the inner section of the right rotating shaft sleeve form a stepped structure. The outer section of the right rotating shaft sleeve is located at the inner circumference position of the outer section of the right fixed support sleeve, and the inner section of the right rotating shaft sleeve is located inside the housing body; A plurality of grooves are arranged on the outer circumference of the inner section of the right rotating shaft sleeve. An oil seal ring and a wear-resistant support pad are respectively arranged in the plurality of grooves. A rotating seal connection is formed between the inner section of the right rotating shaft sleeve and the right inner surface of the housing body through the oil seal ring and the wear-resistant support pad; A wear-resistant support pad is arranged between the longitudinal stepped surface of the outer section of the right rotating shaft sleeve and the rightmost end face of the housing body. A rotating support is realized between the longitudinal stepped surface of the outer section of the right rotating shaft sleeve and the rightmost end face of the housing body through the wear-resistant support pad; An oil chamber is formed among the outer housing, the main shaft, the left rotating shaft sleeve, and the right rotating shaft sleeve; A piston sleeve is provided on the outer circumference of the second shaft section. The piston sleeve includes a left rotating sealing section of the piston sleeve and a right rotating connecting section of the piston sleeve. The left rotating sealing section of the piston sleeve is located at the left section position of the second shaft section, and the right rotating connecting section of the piston sleeve is located at the right section position of the second shaft section. A plurality of grooves are provided on the inner circumference of the left rotating sealing section of the piston sleeve, and an oil seal ring and a wear-resistant support pad are respectively provided in the plurality of grooves. A rotary sealing connection is provided between the inner circumference of the left rotating sealing section of the piston sleeve and the outer circumference of the left section position of the second shaft section; A groove is provided on the outer circumference of the left rotating sealing section of the piston sleeve, and an oil seal ring is provided in the groove. A rotary sealing connection is provided between the outer circumference of the left rotating sealing section of the piston sleeve and the inner circumference of the outer housing; The left rotating sealing section of the piston sleeve divides the oil chamber into a left oil chamber and a right oil chamber. The left oil chamber is communicated with the left hydraulic oil hole, and the right oil chamber is communicated with the right hydraulic oil hole; The inner circumference of the right rotating connecting section of the piston sleeve is meshed and rotatably connected with the outer circumference of the right section part of the second shaft section. An internal gear sleeve is provided between the outer circumference of the right rotating connecting section of the piston sleeve and the inner circumference of the outer housing. A meshing and rotary connection is provided between the outer circumference of the right rotating connecting section of the piston sleeve and the inner circumference of the internal gear sleeve. A fixed connection is provided between the outer circumference of the internal gear sleeve and the inner circumference of the outer housing.

2. The swing hydraulic cylinder with high output torque and high sealing performance for the wet shotcreting machine according to claim 1, wherein: A groove is provided on the outer circumference of the outer section of the left rotating shaft sleeve, and a dust-proof seal ring is provided in the groove. A rotary seal is achieved between the outer circumference of the outer section of the left rotating shaft sleeve and the inner circumference of the outer section of the left fixed support sleeve through the dust-proof seal ring; A groove is provided on the outer circumference of the inner section of the right rotating shaft sleeve, and a dust-proof seal ring is provided in the groove. A rotary seal is achieved between the outer circumference of the inner section of the right rotating shaft sleeve and the outer section of the right fixed support sleeve through the dust-proof seal ring.

3. The swinging hydraulic cylinder with high output torque and high sealing performance for the wet shotcreting machine according to claim 1, characterized in that: The number of the left hydraulic oil holes is two, namely a left first oil hole and a left second oil hole, and the left first oil hole and the left second oil hole are respectively communicated with the left oil chamber; The number of the right hydraulic oil holes is two, namely a right first oil hole and a right second oil hole, and the right first oil hole and the right second oil hole are respectively communicated with the right oil chamber.

4. The oscillating hydraulic cylinder with high output torque and high sealing performance for a wet shotcreting machine according to claim 1, characterized in that: The number of the grooves on the outer circumference of the inner section of the left rotating shaft sleeve is two, and the two grooves are sequentially arranged along the axial direction on the outer circumference of the inner section of the left rotating shaft sleeve. An oil seal ring is provided in the groove located on the outside, and a wear-resistant support pad is provided in the groove located on the inside; The number of the grooves on the outer circumference of the inner section of the right rotating shaft sleeve is three, and the three grooves are sequentially arranged along the axial direction on the outer circumference of the inner section of the right rotating shaft sleeve. Oil seal rings are respectively provided in the grooves located on the outside and in the middle, and a wear-resistant support pad is provided in the groove located on the inside.

5. The oscillating hydraulic cylinder with high output torque and high sealing performance for a wet shotcreting machine according to claim 1, wherein: The number of the grooves on the inner circumference of the left rotating sealing section of the piston sleeve is three, and the three grooves are sequentially arranged along the axial direction on the inner circumference of the left rotating sealing section of the piston sleeve. Oil seal rings are provided in the grooves located on both sides, and a wear-resistant support pad is provided in the groove located in the middle.

6. The swing hydraulic cylinder with high output torque and high sealing performance for a wet shotcreting machine according to claim 1, wherein: The outer circumference of the internal gear sleeve and the inner circumference of the housing are fixed by welding, and the welding points are respectively located on both axial sides of the internal gear sleeve.

7. The swing hydraulic cylinder with high output torque and high sealing performance for wet shotcreting machines according to claim 1, characterized in that: The thickness of the oil seal ring on the outer circumference of the inner section of the left rotating shaft sleeve is 15 mm ± 2 mm; The thickness of the oil seal ring in the middle groove on the outer circumference of the inner section of the right rotating shaft sleeve is 15 mm ± 2 mm; The width of the wear-resistant support pad on the outer circumference of the inner section of the right rotating shaft sleeve is 55 mm ± 5 mm.

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