Swing oil cylinder for drill jumbo with encoder switching and assembling structures on two sides

Abstract

The utility model provides a drill jumbo swing oil cylinder with a two-side switching assembly encoder structure, which is provided with an outer shell, a left rotating shaft sleeve, a right fixing seat plate, a locking shaft and a fixing shaft sleeve, the left rotating shaft sleeve is positioned on the left side in the outer shell, and the right fixing seat plate is positioned on the right side of the outer shell. The fixed shaft sleeve is located on the outer circumference of the locking shaft, the locking shaft can move left and right in a hole in the left section of the left rotating shaft sleeve and the interior of the fixed shaft sleeve, when the locking shaft moves leftwards, the locking shaft and the left rotating shaft sleeve can be locked and fixed, and when the locking shaft moves rightwards, the locking shaft and the fixed shaft sleeve can be locked and fixed. And the axial outer side end part of the left rotating shaft sleeve and the right side end part of the locking shaft can be connected with an encoder. The encoders can be installed at the two ends of the swing oil cylinder and can be installed according to actual requirements, the rotating angle of the left rotating shaft sleeve can be monitored in real time, and operation is easy and fast. The swing oil cylinder can be widely applied to swing oil cylinders.

Description

Technical Field

[0001] This utility model relates to a swing cylinder, and more particularly to a swing cylinder for a rock drilling rig with a two-sided switching encoder assembly structure. Background Technology

[0002] A swing cylinder is a drive device that uses hydraulic oil to drive an internal mechanical structure, converting hydraulic energy into mechanical energy to achieve the reciprocating swing motion of the output shaft.

[0003] In practical use, in order to monitor the rotation angle of the output shaft in real time, an encoder is usually installed on the output shaft. The encoder provides real-time feedback on the rotation angle of the output shaft and adjusts the rotation angle in real time according to actual needs.

[0004] However, the swing cylinder used in rock drilling rigs has only one side of its output shaft exposed, so the encoder can only be installed on that side. The other side cannot be installed. When there is installation interference on that side, the encoder cannot be installed. This has great limitations and a small range of applications, and ultimately it is impossible to monitor the rotation angle of the output shaft in real time. Utility Model Content

[0005] This utility model addresses the above-mentioned technical problems by providing a rock drilling rig swing cylinder with a dual-side switching encoder mounting structure. Encoders can be installed at both ends of the output shaft of the swing cylinder, and either end can be selected for installation according to actual installation requirements. Both ends can monitor the rotation angle of the output shaft in real time. The operation is simple and quick, with few limitations and a wide range of applications.

[0006] Therefore, the technical solution of this utility model is a rock drilling rig swing cylinder with a two-sided switching assembly encoder structure, which is provided with an outer shell, a left rotating bushing, and a right fixed seat plate. The left rotating bushing is located inside the outer shell on the left side, and the outer circumference of the left rotating bushing is rotatably and sealedly connected to the inner circumference of the outer shell. The right fixed seat plate is located on the right side of the outer shell, and the right fixed seat plate is sealed and fixedly connected to the outer shell.

[0007] The left rotating bushing has a hollow structure and consists of a left section and a right section. The left section of the left rotating bushing has an axial through hole.

[0008] The right-side mounting plate has an axial through hole;

[0009] The housing is also equipped with a locking shaft and a fixing sleeve. The fixing sleeve is located on the outer circumference of the locking shaft. The left inner circumference of the fixing sleeve is sealed to the middle outer circumference of the locking shaft. The right side of the fixing sleeve is located inside the hole on the right fixing plate. The right outer circumference of the fixing sleeve is sealed to the inner circumference of the hole on the right fixing plate.

[0010] The leftmost part of the locking shaft is located inside the hole on the left section of the left rotating bushing, and is sealed to the inner circumference of the hole. The rightmost part of the locking shaft is located inside the hole on the right fixed base plate.

[0011] The outer casing, the left rotating bushing, the right fixed base plate, the locking shaft, and the fixed bushing together form an oil cavity;

[0012] The outer casing is also equipped with a rotary piston, which is located between the fixed bushing and the left rotary bushing. The rotary piston consists of a left section and a right section. The outer circumference of the left section of the rotary piston meshes with the right section of the left rotary bushing. The inner circumference of the left section of the rotary piston is rotaryly sealed to the outer circumference of the left side of the fixed bushing on the locking shaft. The outer circumference of the right section of the rotary piston is rotaryly sealed to the inner circumference of the outer casing. The inner circumference of the right section of the rotary piston meshes with the outer circumference of the fixed bushing.

[0013] The right section of the rotating piston divides the oil chamber into a left oil chamber and a right oil chamber. The outer shell is provided with a left oil hole that runs through both the inside and outside. The inner oil port of the left oil hole is located at the leftmost position of the left oil chamber and is connected to the left oil chamber. The right fixed base plate is provided with a right oil hole that runs through both the inside and outside. The inner oil port of the right oil hole is located at the rightmost position of the right oil chamber and is connected to the right oil chamber.

[0014] The locking shaft can move left and right in the hole on the left section of the left rotating bushing and inside the fixed bushing. When the locking shaft moves to the left, it can be locked and fixed with the left rotating bushing. When the locking shaft moves to the right, it can be locked and fixed with the fixed bushing.

[0015] An encoder can be connected to both the outer axial end of the left rotating bushing and the right end of the locking shaft.

[0016] Preferably, a locking ring is provided between the right section of the left rotating bushing and the outer shell, the locking ring and the outer shell are rotated and fitted together, and the locking ring and the right section of the left rotating bushing are locked and fixed together by a stop washer;

[0017] The inner circumference of the outer shell is fixedly provided with a first limiting boss and a second limiting boss at the position between the left section of the left rotating bushing and the locking ring. The first limiting boss is axially fitted with the left section of the left rotating bushing, and the second limiting boss is axially fitted with the locking ring, thereby realizing the axial positioning of the left rotating bushing and the locking ring with the outer shell.

[0018] Preferably, the left end face of the locking shaft is located on the axial inner side of the adjacent end face of the hole on the left section of the left rotating bushing, the inner circumference of the hole on the left section of the left rotating bushing is provided with a first locking slope, the left outer circumference of the locking shaft is provided with a second locking slope located to the right of the first locking slope, and the left end of the locking shaft is provided with a first locking hole.

[0019] When it is necessary to lock the locking shaft to the left rotating bushing, a locking block is installed on the left side of the left section of the left rotating bushing. The locking block has an axial through hole. A screw is threaded through the hole on the locking block and locked to the first locking hole. Under the axial support of the locking block and the left rotating bushing, the locking shaft is pulled to the left. A wedge-shaped lock is formed between the first locking slope and the second locking slope, thus finally locking the locking shaft to the left rotating bushing.

[0020] Preferably, the right end face of the locking shaft is located on the axial inner side of the outer end face of the fixed bushing, a fourth locking slope is provided on the left inner circumference of the fixed bushing, a third locking slope is provided on the right outer circumference of the locking shaft located to the left of the fourth locking slope, and a second locking hole is provided at the right end of the locking shaft.

[0021] When it is necessary to lock the locking shaft to the fixed bushing, a locking block is installed on the right side of the fixed bushing. The screw is threaded through the hole on the locking block and locked into the second locking hole. Under the axial support of the locking block and the fixed bushing, the locking shaft is pulled to the right, and a wedge-shaped lock is formed between the third locking slope and the fourth locking slope, thus finally achieving the locking and fixing of the locking shaft and the fixed bushing.

[0022] Preferably, the left end of the locking shaft is provided with a first limiting groove, the left end of the left rotating bushing is provided with a third limiting groove, and the locking block is provided with a limiting boss. When the locking block is locked with the left side of the locking shaft, the limiting boss is located inside the first limiting groove and the third limiting groove at the same time, and is locked to each other.

[0023] The right end of the locking shaft is provided with a second limiting groove, and the right end of the fixed bushing is provided with a limiting groove. When the locking block is locked with the right side of the locking shaft, the limiting boss is located inside the second limiting groove and the limiting groove on the right end of the fixed bushing, and they are locked together.

[0024] Preferably, the inner circumference of the outer shell is provided with multiple axially distributed grooves on the outer side of the first limiting boss. Each groove is provided with a dustproof sealing ring, an oil sealing ring, and a rotating wear-resistant pad. The dustproof sealing ring, the oil sealing ring, and the rotating wear-resistant pad are arranged sequentially from the outside to the inside. The left rotating bushing and the outer shell are connected by a rotary seal through the dustproof sealing ring and the oil sealing ring, respectively. The left rotating bushing and the outer shell are supported by a rotating wear-resistant pad.

[0025] Rotary wear-resistant pads are provided between the first limiting boss and the left section of the left rotating bushing, and between the second limiting boss and the locking ring. Axial rotational support is achieved between the first limiting boss and the left section of the left rotating bushing, and between the second limiting boss and the locking ring, respectively.

[0026] The outer circumference of the locking ring is provided with a groove, and a rotating wear-resistant pad is provided in the groove. The locking ring and the outer shell are rotated and supported by the rotating wear-resistant pad.

[0027] The inner circumference of the hole on the left section of the left rotating bushing is provided with multiple axially distributed grooves. Each groove is provided with a dustproof seal and an oil seal. The dustproof seal and the oil seal are arranged from the outside to the inside. The locking shaft and the hole on the left section of the left rotating bushing are sealed to each other through the dustproof seal and the oil seal.

[0028] The inner circumference of the left section of the rotary piston is provided with multiple axially distributed grooves, and each groove is provided with an oil sealing ring and a rotary wear-resistant pad. The inner circumference of the left section of the rotary piston and the outer circumference of the locking shaft are mutually sealed and mutually supported by the oil sealing ring and the rotary wear-resistant pad, respectively.

[0029] The outer circumference of the right section of the rotary piston is provided with multiple axially distributed grooves. Each groove contains an oil sealing ring and a rotary wear-resistant pad. The outer circumference of the right section of the rotary piston and the inner circumference of the outer shell are respectively sealed and supported by the oil sealing ring and the rotary wear-resistant pad.

[0030] The left inner circumference of the fixed bushing is provided with multiple axially distributed grooves, and each groove is provided with a dustproof sealing ring, an oil sealing ring, and a rotating wear-resistant pad. The left inner circumference of the fixed bushing and the outer circumference of the locking shaft are mutually sealed and mutually supported by the dustproof sealing ring, the oil sealing ring, and the rotating wear-resistant pad, respectively.

[0031] Preferably, an oil injection hole and an oil release hole are respectively provided on the outer casing between the dustproof sealing ring and the oil sealing ring on the left side, and the inner oil ports of the oil injection hole and the oil release hole are respectively connected to the left section of the left rotating bushing.

[0032] Preferably, the oil injection hole and the oil release hole are respectively arranged opposite each other on the outer casing along the circumferential direction.

[0033] Preferably, an oil balance valve is provided on the outside of the outer casing, and the oil outlets of the two oil holes on the oil balance valve are respectively connected to the left oil hole and the right oil hole.

[0034] The beneficial effects of this utility model are that by installing a locking shaft inside the outer casing, when installation interference occurs on the left side of the oil cylinder and the encoder cannot be installed, a screw is passed through the hole on the locking block and threaded into the first locking hole. Under the axial support of the locking block and the left rotating bushing, the locking shaft is pulled to the left, and a wedge-shaped lock is formed between the first locking inclined surface and the second locking inclined surface, thus finally achieving the locking and fixing of the locking shaft and the left rotating bushing. The encoder is installed on the right end of the locking shaft. Since the locking shaft and the left rotating bushing rotate synchronously, the encoder can monitor the rotation angle of the left rotating bushing in real time. The operation process is simple and quick, and the effect is significant, without the need for additional adjustment.

[0035] When installation interference occurs on the right side of the hydraulic cylinder, preventing the encoder from being installed, screws are threaded through the holes on the locking block and locked into the second locking hole. Under the axial support of the locking block and the fixed bushing, the locking shaft is pulled to the right, forming a wedge-shaped lock between the third and fourth locking inclined surfaces, ultimately achieving the locking and fixing of the locking shaft and the fixed bushing. The encoder is then installed on the left end of the left rotating bushing. When the hydraulic cylinder is running, the rotating piston rotates and translates, causing the left rotating bushing to rotate in both directions. Both the locking shaft and the fixed bushing remain stationary. The encoder on the left rotating bushing can monitor the rotation angle of the left rotating bushing in real time. The operation process is simple and quick. Attached Figure Description

[0036] Figure 1 This is a perspective view of the utility model;

[0037] Figure 2 This is another perspective view of the present invention;

[0038] Figure 3 This is the right view of this utility model;

[0039] Figure 4 This is a utility model Figure 3 Sectional view of AA;

[0040] Figure 5 This is a utility model Figure 4 Enlarged view at point B in the middle;

[0041] Figure 6 This is a utility model Figure 5 Enlarged view at point C;

[0042] Figure 7 This is a utility model Figure 4 Enlarged view of section J in the middle;

[0043] Figure 8 This is a perspective view of the left rotating bushing in this utility model;

[0044] Figure 9This is a cross-sectional view of the left rotating bushing portion of this utility model;

[0045] Figure 10 This is a cross-sectional view of the fixed bushing portion of this utility model;

[0046] Figure 11 This is a utility model Figure 9 Enlarged view at point D;

[0047] Figure 12 This is a utility model Figure 10 Enlarged view at point E in the middle;

[0048] Figure 13 This is a perspective view of the locking shaft in this utility model;

[0049] Figure 14 This is another perspective view of the locking shaft in this utility model;

[0050] Figure 15 This is a utility model Figure 13 Enlarged view at point F;

[0051] Figure 16 This is a utility model Figure 14 Enlarged view at point G;

[0052] Figure 17 This is a utility model Figure 14 Enlarged view at point H;

[0053] Figure 18 This is a perspective view of the locking block in this utility model.

[0054] Explanation of symbols in the diagram:

[0055] 1. Outer shell; 101. Oil filling hole; 102. First limiting boss; 103. Second limiting boss; 104. Oil release hole; 2. Left side rotating bushing; 201. First locking bevel; 202. Left section of left side rotating bushing; 203. Right section of left side rotating bushing; 204. Third limiting groove; 3. Right side fixed seat plate; 4. Oil balance valve; 5. Locking shaft; 501. First locking hole; 502. Second locking hole; 503. Second locking bevel; 504. Third locking bevel; 5 05. First limiting groove; 506. Second limiting groove; 6. Oil pipe; 7. Locking ring; 8. Rotary piston; 801. Left section of rotary piston; 802. Right section of rotary piston; 9. Fixed bushing; 901. Fourth locking slope; 10. Left oil hole; 11. Right oil hole; 12. Oil cavity; 1201. Left oil cavity; 1202. Right oil cavity; 13. Dustproof sealing ring; 14. Oil sealing ring; 15. Rotary wear-resistant pad; 16. Locking block; 1601. Limiting boss; 17. Stop washer. Detailed Implementation

[0056] The present invention will be further described below with reference to the embodiments.

[0057] pass Figures 1-18 As can be seen, the rock drilling rig swing cylinder with a two-sided switching encoder structure has an outer shell 1, a left rotating bushing 2, and a right fixed seat plate 3. The left rotating bushing 2 is located inside the outer shell 1 on the left side, and the outer circumference of the left rotating bushing 2 is rotatably and sealedly connected to the inner circumference of the outer shell 1. The right fixed seat plate 3 is located on the right side of the outer shell 1, and the right fixed seat plate 3 is sealed and fixedly connected to the outer shell 1.

[0058] The left rotating bushing 2 is a hollow structure. The left rotating bushing 2 is composed of a left section 202 and a right section 203. The left section 202 of the left rotating bushing has an axial through hole, and the right fixed base plate 3 has an axial through hole.

[0059] The outer casing 1 is also provided with a locking shaft 5 and a fixing sleeve 9. The fixing sleeve 9 is located on the outer circumference of the locking shaft 5. The left inner circumference of the fixing sleeve 9 is sealed and connected to the outer circumference of the middle position of the locking shaft 5. The right side of the fixing sleeve 9 is located inside the hole on the right fixing plate 3. The right outer circumference of the fixing sleeve 9 is sealed and fixedly connected to the inner circumference of the hole on the right fixing plate 3.

[0060] The leftmost part of the locking shaft 5 is located inside the hole on the left section 202 of the left rotating bushing, and is sealed to the inner circumference of the hole. The rightmost part of the locking shaft 5 is located inside the hole on the right fixed base plate 3.

[0061] The outer casing 1, the left rotating bushing 2, the right fixed base plate 3, the locking shaft 5, and the fixed bushing 9 together form an oil cavity 12.

[0062] The outer casing 1 also houses a rotary piston 8, located between the fixed bushing 9 and the left rotary bushing 2. The rotary piston 8 consists of a left section 801 and a right section 802. The outer circumference of the left section 801 meshes with the right section 203 of the left rotary bushing. The inner circumference of the left section 801 is rotaryly sealed to the locking shaft 5 located on the left outer circumference of the fixed bushing 9. The outer circumference of the right section 802 is rotaryly sealed to the inner circumference of the outer casing 1. The inner circumference of the right section 802 meshes with the outer circumference of the fixed bushing 9. The rotating piston right section 802 divides the oil chamber 12 into a left oil chamber 1201 and a right oil chamber 1202. The outer shell 1 is provided with a left oil hole 10 that penetrates both inside and outside. The inner oil port of the left oil hole 10 is located at the leftmost position of the left oil chamber 1201 and is connected to the left oil chamber 1201. The right fixed seat plate 3 is provided with a right oil hole 11 that penetrates both inside and outside. The inner oil port of the right oil hole 11 is located at the rightmost position of the right oil chamber 1202 and is connected to the right oil chamber 1202.

[0063] The locking shaft 5 can move left and right in the hole on the left section 202 of the left rotating bushing and inside the fixed bushing 9. When the locking shaft 5 moves to the left, the locking shaft 5 and the left rotating bushing 2 can be locked and fixed. When the locking shaft 5 moves to the right, the locking shaft 5 and the fixed bushing 9 can be locked and fixed.

[0064] An encoder can be connected to both the outer axial end of the left rotating bushing 2 and the right end of the locking shaft 5.

[0065] When installation interference occurs on the right side of the hydraulic cylinder, and an encoder needs to be installed on the outer axial end of the left rotating sleeve 2, the locking shaft 5 is moved to the right so that the locking shaft 5 is locked and fixed to the fixed sleeve 9. When the hydraulic cylinder is running, the rotating piston 8 rotates and translates, causing the left rotating sleeve 2 to rotate in both directions. Both the locking shaft 5 and the fixed sleeve 9 remain stationary. At this time, the encoder on the left rotating sleeve 2 can monitor the rotation angle of the left rotating sleeve 2 in real time.

[0066] When installation interference occurs on the left side of the hydraulic cylinder, and an encoder needs to be installed on the right side of the hydraulic cylinder, the encoder can be installed on the right end of the locking shaft 5. At the same time, the locking shaft 5 is moved to the left so that the locking shaft 5 is locked and fixed with the left rotating sleeve 2. When the hydraulic cylinder is running, the rotating piston 8 rotates and translates, causing the left rotating sleeve 2 to rotate in both directions. The left rotating sleeve 2 rotates in both directions, causing the locking shaft 5 to rotate synchronously. At this time, since the locking shaft 5 and the left rotating sleeve 2 rotate synchronously, the encoder on the right side of the locking shaft 5 can monitor the rotation angle of the left rotating sleeve 2 in real time.

[0067] In one specific embodiment, a locking ring 7 is provided between the right section 203 of the left rotating bushing and the outer shell 1. The locking ring 7 is rotatably fitted with the outer shell 1, and the locking ring 7 and the right section 203 of the left rotating bushing are locked and fixed to each other by a stop washer 17. By installing the locking ring 7, the left rotating bushing 2 can be quickly disassembled and assembled, which is convenient for assembly and maintenance.

[0068] The inner circumference of the outer shell 1 is fixedly provided with a first limiting boss 102 and a second limiting boss 103 at the position between the left section 202 of the left rotating bushing and the locking ring 7. The first limiting boss 102 is axially fitted with the left section 202 of the left rotating bushing, and the second limiting boss 103 is axially fitted with the locking ring 7. This achieves axial limiting between the left rotating bushing 2 and the locking ring 7 and the outer shell 1, effectively preventing axial wobbling of the left rotating bushing 2 when it rotates at high frequency, increasing rotational accuracy and maintaining the stability of the hydraulic cylinder operation.

[0069] In one specific embodiment, the left end face of the locking shaft 5 is located axially inside the adjacent end face of the hole on the left section 202 of the left rotating bushing. A first locking slope 201 is provided on the inner circumference of the hole on the left section 202 of the left rotating bushing. A second locking slope 503 is provided on the right side of the left outer circumference of the locking shaft 5, located on the right side of the first locking slope 201. A first locking hole 501 is provided at the left end of the locking shaft 5. When it is necessary to lock the locking shaft 5 to the left rotating bushing 2, a locking block 1 is installed on the left side of the left section 202 of the left rotating bushing. 6. The locking block 16 has an axial through hole. A screw passes through the hole on the locking block 16 and is threaded into the first locking hole 501. Under the axial support of the locking block 16 and the left rotating bushing 2, the locking shaft 5 is pulled to the left. A wedge-shaped lock is formed between the first locking inclined surface 201 and the second locking inclined surface 503, thus achieving the locking and fixing of the locking shaft 5 and the left rotating bushing 2. The locking and fixing of the locking shaft 5 and the left rotating bushing 2 by the wedge-shaped locking method is simple and quick to operate, with significant effect, and no additional adjustment is required.

[0070] Similarly, the right end face of the locking shaft 5 is located axially inside the outer end face of the fixed bushing 9. The left inner circumference of the fixed bushing 9 is provided with a fourth locking slope 901. The right outer circumference of the locking shaft 5 is provided with a third locking slope 504 located to the left of the fourth locking slope 901. The right end of the locking shaft 5 is provided with a second locking hole 502. When it is necessary to lock the locking shaft 5 and the fixed bushing 9, a locking block 16 is installed on the right side of the fixed bushing 9. The screw passes through the hole on the locking block 16 and is threaded into the second locking hole 502. Under the axial support of the locking block 16 and the fixed bushing 9, the locking shaft 5 is pulled to the right. A wedge-shaped lock is formed between the third locking slope 504 and the fourth locking slope 901, and finally the locking shaft 5 and the fixed bushing 9 are locked.

[0071] In one specific embodiment, the left end of the locking shaft 5 is provided with a first limiting groove 505, the left end of the left rotating bushing 2 is provided with a third limiting groove 204, and the locking block 16 is provided with a limiting boss 1601. When the locking block 16 is locked with the left side of the locking shaft 5, the limiting boss 1601 is simultaneously located inside the first limiting groove 505 and the third limiting groove 204, and is locked to each other, thus completing the locking and fixing between the locking shaft 5 and the left rotating bushing 2. This can prevent the locking shaft 5 and the left rotating bushing 2 from becoming loose when the left rotating bushing 2 rotates frequently, which would cause the rotation angles of the locking shaft 5 and the left rotating bushing 2 to be asynchronous, ultimately affecting the monitoring accuracy of the encoder. The purpose is to install the encoder on the right end of the locking shaft 5.

[0072] Similarly, the right end of the locking shaft 5 is provided with a second limiting groove 506, and the right end of the fixed bushing 9 is provided with a limiting groove. When the locking block 16 is locked with the right side of the locking shaft 5, the limiting boss 1601 is located inside the second limiting groove 506 and the limiting groove on the right end of the fixed bushing 9, and they are locked together to complete the locking and fixing between the locking shaft 5 and the fixed bushing 9. This can prevent the locking shaft 5 from shaking due to the rotational force when the left rotating bushing 2 rotates frequently, which would interfere with the normal rotation of the left rotating bushing 2. The purpose is to install an encoder on the left end of the left rotating bushing 2.

[0073] In one specific embodiment, the inner circumference of the outer shell 1 is provided with multiple axially distributed grooves outside the first limiting boss 102. Each groove contains a dustproof sealing ring 13, an oil sealing ring 14, and a rotating wear-resistant pad 15, arranged sequentially from the outside inwards. The left rotating bushing 2 and the outer shell 1 are connected by a rotary seal via the dustproof sealing ring 13 and the oil sealing ring 14, respectively. The left rotating bushing 2 and the outer shell 1 are provided with rotary support via the rotating wear-resistant pad 15. The first limiting boss 102 and the left section 2 of the left rotating bushing are connected by a rotary seal. Rotary wear-resistant pads 15 are provided between the first limiting boss 102 and the left section 202 of the left rotating bushing, and between the second limiting boss 103 and the locking ring 7, respectively. Axial rotational support is achieved between the first limiting boss 102 and the left section 202 of the left rotating bushing, and between the second limiting boss 103 and the locking ring 7, respectively, through the rotary wear-resistant pads 15. The outer circumference of the locking ring 7 is provided with a groove, and the rotary wear-resistant pads 15 are provided in the groove. Rotary support is achieved between the locking ring 7 and the outer shell 1 through the rotary wear-resistant pads 15. The inner circumference of the hole on the left section 202 of the left rotating bushing is provided with multiple axially distributed grooves, and dustproof sealing rings 13 and oil sealing rings are provided in the multiple grooves, respectively. 14. Dustproof sealing rings 13 and oil sealing rings 14 are arranged sequentially from the outside to the inside. The locking shaft 5 and the hole on the left section 202 of the left rotating bushing are mutually sealed by the dustproof sealing rings 13 and the oil sealing rings 14. The inner circumference of the left section 801 of the rotating piston is provided with multiple axially distributed grooves, and the oil sealing rings 14 and rotating wear-resistant pads 15 are respectively provided in the multiple grooves. The inner circumference of the left section 801 of the rotating piston and the outer circumference of the locking shaft 5 are mutually sealed and mutually supported by the oil sealing rings 14 and the rotating wear-resistant pads 15. The outer circumference of the right section 802 of the rotating piston is provided with multiple axially distributed grooves. The grooves are provided with oil sealing rings 14 and rotating wear-resistant pads 15 respectively. The outer circumference of the right section 802 of the rotating piston and the inner circumference of the outer shell 1 are rotated and supported by the oil sealing rings 14 and rotating wear-resistant pads 15 respectively. The left inner circumference of the fixed bushing 9 is provided with multiple axially distributed grooves, and the grooves are provided with dustproof sealing rings 13, oil sealing rings 14 and rotating wear-resistant pads 15 respectively. The left inner circumference of the fixed bushing 9 and the outer circumference of the locking shaft 5 are mutually sealed and mutually supported by the dustproof sealing rings 13, oil sealing rings 14 and rotating wear-resistant pads 15 respectively.

[0074] The dustproof sealing ring 13 is located on the outermost side. Its function is to prevent impurities in the external environment from entering the cylinder and causing contamination and damage to the internal components, thus affecting the service life of the cylinder. The oil sealing ring 14 prevents the hydraulic oil inside the cylinder from leaking outward. Hydraulic oil leakage will directly affect the stability of the cylinder's operating pressure, causing pressure loss and resulting in unstable rotation angles during cylinder operation, thus reducing operating accuracy. The wear-resistant support pad 15 is made of materials with high wear resistance, high dry running characteristics, high support force, and high guiding stability, such as PTFE+copper powder, phenolic cloth, cypress, and nylon. By setting the wear-resistant support pad 15, the stability of the corresponding rotating parts during relative rotation can be improved, and direct friction between rotating parts can be avoided, which can lead to collisions and wear, reducing the service life.

[0075] Furthermore, the wear-resistant support pad 15 also has excellent thermal conductivity, which can reduce the temperature of its surrounding components and prevent high-temperature damage to surrounding components, such as high-temperature damage to the sealing ring.

[0076] In one specific embodiment, an oil filling hole 101 and an oil releasing hole 104, which are through the inside and outside, are respectively provided on the outer casing 1 between the dustproof sealing ring 13 and the oil sealing ring 14 on the left side. A plug is installed on the outer port of the oil filling hole 101 and the oil releasing hole 104, and the inner oil port of the oil filling hole 101 and the oil releasing hole 104 are respectively connected to the left section 202 of the left rotating bushing.

[0077] Since the dust seal 13 and the adjacent oil seal 14 cannot contact the oil during operation, they are prone to wear under prolonged rotation. Therefore, an oil injection hole 101 and an oil release hole 104 are provided between the dust seal 13 and the adjacent oil seal 14. The operator injects lubricating oil, such as grease, into the dust seal 13 and the oil seal 14 through the oil injection hole 101, which can lubricate the dust seal 13 and the oil seal 14, minimizing wear and extending their service life. In addition, after the cylinder has been running for a period of time, the lubricating oil in this area will become contaminated to varying degrees and needs to be replaced. At this time, the lubricating oil inside can be drained through the oil release hole 104, and then new lubricating oil can be added again through the oil injection hole 101 to ensure the sealing performance of the dust seal 13 and the oil seal 14.

[0078] In one specific embodiment, the oil injection hole 101 and the oil release hole 104 are respectively arranged opposite each other on the outer casing 1 along the circumferential direction. By extending the distance between the oil injection hole 101 and the oil release hole 104, the effect of lubricating oil discharge is increased.

[0079] In one specific embodiment, an oil balance valve 4 is provided on the outside of the outer casing 1. The oil outlets of the two oil holes on the oil balance valve 4 are respectively connected to the left oil hole 10 and the right oil hole 11. The oil balance valve 4 can further maintain the stability of pressure during oil transmission, ensure the rotation accuracy of the oil cylinder, and extend its service life.

[0080] However, the above description is only a specific embodiment of this utility model and should not be construed as limiting the scope of implementation of this utility model. Therefore, any substitution of equivalent components or equivalent changes and modifications made in accordance with the scope of protection of this utility model should still fall within the scope of the claims of this utility model.

Claims

1. A rock drilling rig with a dual-side switching encoder assembly structure, characterized in that: The device comprises an outer shell, a left rotating bushing, and a right fixed base plate. The left rotating bushing is located inside the outer shell on the left side, and its outer circumference is rotatably and sealingly connected to the inner circumference of the outer shell. The right fixed base plate is located on the right side of the outer shell and is sealed and fixedly connected to the outer shell. The left rotating bushing has a hollow structure and is composed of a left section and a right section. The left section of the left rotating bushing has an axial through hole. The right-side fixed base plate is provided with an axial through hole; The housing is further provided with a locking shaft and a fixing sleeve. The fixing sleeve is located on the outer circumference of the locking shaft. The left inner circumference of the fixing sleeve is sealed to the middle outer circumference of the locking shaft. The right side of the fixing sleeve is located inside the hole on the right fixing plate. The right outer circumference of the fixing sleeve is sealed to the inner circumference of the hole on the right fixing plate. The leftmost part of the locking shaft is located inside the hole on the left section of the left rotating bushing, and is sealed to the inner circumference of the hole. The rightmost part of the locking shaft is located inside the hole on the right fixed base plate. The outer casing, the left rotating bushing, the right fixed base plate, the locking shaft, and the fixed bushing together form an oil cavity; The outer casing is also equipped with a rotating piston located between the fixed bushing and the left rotating bushing. The rotating piston consists of a left section and a right section. The outer circumference of the left section of the rotating piston meshes with the right section of the left rotating bushing. The inner circumference of the left section of the rotating piston is rotatably sealed to the outer circumference of the fixed bushing on the locking shaft. The outer circumference of the right section of the rotating piston is rotatably sealed to the inner circumference of the outer casing. The inner circumference of the right section of the rotating piston meshes with the outer circumference of the fixed bushing. The right section of the rotating piston divides the oil chamber into a left oil chamber and a right oil chamber. The outer shell is provided with a left oil hole that runs through both the inside and outside. The inner oil port of the left oil hole is located at the leftmost position of the left oil chamber and is connected to the left oil chamber. The right fixed base plate is provided with a right oil hole that runs through both the inside and outside. The inner oil port of the right oil hole is located at the rightmost position of the right oil chamber and is connected to the right oil chamber. The locking shaft can move left and right in the hole on the left section of the left rotating bushing and inside the fixed bushing. When the locking shaft moves to the left, the locking shaft and the left rotating bushing can be locked and fixed. When the locking shaft moves to the right, the locking shaft and the fixed bushing can be locked and fixed. Both the outer axial end of the left rotating bushing and the right end of the locking shaft can be connected to an encoder.

2. The rock drilling rig swing cylinder with a two-sided switching encoder structure according to claim 1, characterized in that: A locking ring is provided between the right section of the left rotating bushing and the outer shell. The locking ring and the outer shell are rotatably fitted together. The locking ring and the right section of the left rotating bushing are locked and fixed to each other by a stop washer. The inner circumference of the outer shell is fixedly provided with a first limiting boss and a second limiting boss at the position between the left section of the left rotating bushing and the locking ring. The first limiting boss is axially fitted with the left section of the left rotating bushing, and the second limiting boss is axially fitted with the locking ring, thereby realizing the axial positioning of the left rotating bushing and the locking ring with the outer shell.

3. The rock drilling rig swing cylinder with a two-sided switching encoder structure according to claim 1, characterized in that: The left end face of the locking shaft is located on the axial inner side of the adjacent end face of the hole on the left section of the left rotating bushing. The inner circumference of the hole on the left section of the left rotating bushing is provided with a first locking slope. The left outer circumference of the locking shaft is provided with a second locking slope located to the right of the first locking slope. The left end of the locking shaft is provided with a first locking hole. When it is necessary to lock the locking shaft to the left rotating bushing, a locking block is installed on the left side of the left section of the left rotating bushing. The locking block has an axial through hole. A screw is threaded through the hole on the locking block and locked to the first locking hole. Under the axial support of the locking block and the left rotating bushing, the locking shaft is pulled to the left. A wedge-shaped lock is formed between the first locking slope and the second locking slope, thus finally locking the locking shaft to the left rotating bushing.

4. The rock drilling rig swing cylinder with a two-sided switching encoder structure according to claim 3, characterized in that: The right end face of the locking shaft is located on the axial inner side of the outer end face of the fixed bushing. The left inner circumference of the fixed bushing is provided with a fourth locking slope. The right outer circumference of the locking shaft is provided with a third locking slope located to the left of the fourth locking slope. The right end of the locking shaft is provided with a second locking hole. When it is necessary to lock the locking shaft to the fixed bushing, a locking block is installed on the right side of the fixed bushing. The screw is threaded through the hole on the locking block and locked into the second locking hole. Under the axial support of the locking block and the fixed bushing, the locking shaft is pulled to the right, and a wedge-shaped lock is formed between the third locking slope and the fourth locking slope, thus finally achieving the locking and fixing of the locking shaft and the fixed bushing.

5. The rock drilling rig swing cylinder with a two-sided switching encoder structure according to claim 4, characterized in that: The left end of the locking shaft is provided with a first limiting groove, the left end of the left rotating bushing is provided with a third limiting groove, and the locking block is provided with a limiting boss. When the locking block is locked to the left side of the locking shaft, the limiting boss is located inside the first limiting groove and the third limiting groove at the same time, and is locked to each other. The right end of the locking shaft is provided with a second limiting groove, and the right end of the fixed bushing is provided with a limiting groove. When the locking block is locked to the right side of the locking shaft, the limiting boss is located inside the second limiting groove and the limiting groove on the right end of the fixed bushing, and they are locked together.

6. The rock drilling rig swing cylinder with a two-sided switching encoder structure according to claim 5, characterized in that: The inner circumference of the outer shell is provided with multiple axially distributed grooves on the outside of the first limiting boss. Each of the multiple grooves is provided with a dustproof sealing ring, an oil sealing ring, and a rotating wear-resistant pad. The dustproof sealing ring, the oil sealing ring, and the rotating wear-resistant pad are arranged sequentially from the outside to the inside. The left rotating bushing and the outer shell are connected by a rotary seal through the dustproof sealing ring and the oil sealing ring, respectively. The left rotating bushing and the outer shell are supported by a rotating wear-resistant pad. Rotary wear-resistant pads are provided between the first limiting boss and the left section of the left rotating bushing, and between the second limiting boss and the locking ring. Axial rotational support is achieved between the first limiting boss and the left section of the left rotating bushing, and between the second limiting boss and the locking ring, respectively, through the rotary wear-resistant pads. The outer circumference of the locking ring is provided with a groove, and a rotating wear-resistant pad is provided in the groove. The locking ring and the outer shell are rotated and supported by the rotating wear-resistant pad. The inner circumference of the hole on the left section of the left rotating bushing is provided with multiple axially distributed grooves, and each of the multiple grooves is provided with a dustproof sealing ring and an oil sealing ring. The dustproof sealing ring and the oil sealing ring are arranged sequentially from the outside to the inside. The locking shaft and the hole on the left section of the left rotating bushing are mutually sealed by the dustproof sealing ring and the oil sealing ring. The inner circumference of the left section of the rotary piston is provided with multiple axially distributed grooves, and each of the multiple grooves is provided with an oil sealing ring and a rotating wear-resistant pad. The inner circumference of the left section of the rotary piston and the outer circumference of the locking shaft are mutually sealed and mutually supported by the oil sealing ring and the rotating wear-resistant pad, respectively. The outer circumference of the right section of the rotary piston is provided with multiple axially distributed grooves, and each of the multiple grooves is provided with an oil sealing ring and a rotary wear-resistant pad. The outer circumference of the right section of the rotary piston and the inner circumference of the outer shell are respectively rotated and supported by the oil sealing ring and the rotary wear-resistant pad. The left inner circumference of the fixed bushing is provided with multiple axially distributed grooves, and each of the multiple grooves is provided with a dustproof sealing ring, an oil sealing ring, and a rotating wear-resistant pad. The left inner circumference of the fixed bushing and the outer circumference of the locking shaft are mutually sealed and mutually supported by the dustproof sealing ring, the oil sealing ring, and the rotating wear-resistant pad, respectively.

7. The rock drilling rig swing cylinder with a two-sided switching encoder structure according to claim 6, characterized in that: The outer casing is provided with an oil injection hole and an oil release hole that pass through the inside and outside of the casing between the dustproof sealing ring and the oil sealing ring on the left side. The inner oil ports of the oil injection hole and the oil release hole are respectively connected to the left section of the left rotating bushing.

8. The rock drilling rig swing cylinder with a two-sided switching encoder structure according to claim 7, characterized in that: The oil injection hole and the oil release hole are respectively arranged opposite each other on the outer shell along the circumferential direction.

9. The rock drilling rig swing cylinder with a two-sided switching encoder structure according to claim 1, characterized in that: An oil balance valve is provided on the outside of the outer casing, and the oil outlets of the two oil holes on the oil balance valve are respectively connected to the left oil hole and the right oil hole.

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