An automatic bottom lifting device for hydraulic support in coal mines

Abstract

The present invention relates to the technical field of hydraulic support bottom lifting, and specifically to an automatic bottom lifting device for a coal mine hydraulic support. It comprises a symmetrically arranged left base and a right base, and a push frame is arranged between the left base and the right base. The automatic bottom lifting device comprises a horizontally arranged driving assembly, a transmission assembly detachably mounted on the push frame, and a connecting assembly for pulling and lifting the support base, the transmission assembly comprises a quick-release bottom plate, a top plate, and a transmission connecting piece, the quick-release bottom plate is detachably mounted on the push frame, the top plate is connected to the quick-release bottom plate, the transmission connecting piece is installed between the quick-release bottom plate and the top plate, the transmission connecting piece is transmission-connected to the connecting assembly, and the connecting assembly is respectively hinged to the left base and the right base. The transmission assembly comprises a quick-release bottom plate, a top plate, and a transmission connecting piece. The present invention solves the problems of large space, unstable transmission, and difficult maintenance of traditional bottom lifting devices, and has the advantages of saving space, stable transmission, convenient maintenance, and adaptability to multiple working conditions, and can improve the working efficiency and safety of coal mine supports.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic support bottom lifting, and in particular to an automatic bottom lifting device for a coal mine hydraulic support. Background Art

[0002] Previous coal mine hydraulic support bottom lifting devices usually have the defects of complex structure and large space occupation. In the limited working space underground in coal mines, such large-volume devices are not only difficult to install, but also affect the layout and operation of other equipment. Moreover, its complex structure makes maintenance and repair more difficult. Once a failure occurs, it often takes a lot of time and manpower to investigate and repair, which seriously affects the production efficiency of coal mines.

[0003] The driving mode and transmission structure design of the traditional bottom lifting device are not reasonable, the force transmission efficiency is low, and the energy loss is large. This not only causes energy waste, but also makes the bottom lifting action not accurate and stable, and is prone to problems such as jamming and asynchronism, affecting the performance and reliability of the entire hydraulic support.

[0004] In addition, traditional devices are not good at adapting to different working conditions. Due to the complex and changeable geological conditions in coal mines, different mining areas and working environments have different requirements for the bottom lifting of hydraulic supports. However, previous devices often lack flexibility and adjustability, making it difficult to meet the diverse working conditions. Summary of the invention

[0005] Based on this, it is necessary to provide a coal mine hydraulic support automatic bottom lifting device to address the existing technical problems.

[0006] In order to solve the problems of the prior art, the technical solution adopted by the present invention is:

[0007] The present invention provides an automatic bottom lifting device for a coal mine hydraulic support. The hydraulic support comprises a symmetrically arranged left base and a right base, the left base and the right base are combined to form a support base, a sliding frame is arranged between the left base and the right base, and the automatic bottom lifting device comprises a horizontally arranged driving component, a transmission component detachably mounted on the sliding frame, and a connecting component for pulling and lifting the support base, the length direction of the driving component is perpendicular to the length direction of the support base, the output end of the driving component is transmission-connected to the transmission component, the transmission component comprises a quick-release bottom plate, a top plate and a transmission connecting piece, the quick-release bottom plate is detachably mounted on the sliding frame, the top plate is slidingly connected to the quick-release bottom plate, the transmission connecting piece is installed between the quick-release bottom plate and the top plate, the transmission connecting piece is transmission-connected to the connecting component, and the connecting component is hinged to the left base and the right base, respectively.

[0008] Preferably, two transmission connecting members are provided, and the two transmission connecting members are symmetrically arranged along the vertical center plane of the bracket base. The transmission connecting member is composed of a first hinged rod, a first hinged seat and a first transmission plate. The first hinged seat is fixedly mounted on the quick-release base plate, one end of the first hinged rod is hinged on the first hinged seat, the other end of the first hinged rod is hinged to the first transmission plate, the first transmission plate is transmission connected to the top plate, and the driving assembly is transmission connected to the first transmission plate.

[0009] Preferably, the driving component is a first bidirectional driving cylinder, which is located between two first transmission plates, and two output ends of the first bidirectional driving cylinder are respectively fixedly connected to the side walls of the two first transmission plates close to the first bidirectional driving cylinder.

[0010] Preferably, the connecting components are two first bottom lifting connecting arms, which are symmetrically arranged along the vertical plane of the bracket base, one end of the first bottom lifting connecting arm is hinged to the top plate, and the other ends of the two first bottom lifting connecting arms are respectively hinged to the top of the left base and the right base.

[0011] Preferably, the transmission connection also includes a slider and a sliding guide rail. The slider is fixedly connected to one end of the first transmission plate close to the top plate. The sliding guide rail is fixedly installed on the top plate. The length direction of the sliding guide rail is consistent with the length direction of the driving assembly. The slider is slidably connected to the top plate through the sliding guide rail.

[0012] On the other hand, the transmission connection also includes a second hinged rod, one end of the second hinged rod is hinged to an end of the first transmission plate away from the first hinged rod, and the other end of the second hinged rod is hinged to an end of the top plate close to the left base or the right base, and the length of the first hinged rod is consistent with that of the second hinged rod.

[0013] On the other hand, the driving assembly is two horizontally arranged bottom lifting jacks, which are respectively arranged on the left base and the right base. One end of the bottom lifting jack is hinged to the left base or the right base, and the output end of the bottom lifting jack is hinged to the side wall of the first transmission plate close to the bottom lifting jack.

[0014] On the other hand, there are two groups of transmission connecting parts and they are symmetrically arranged along the vertical center plane of the bracket base. The transmission connecting parts are composed of a cam, a center seat and a resistance block. The driving component is a second two-way driving cylinder. The center seat is fixedly mounted on the quick-release base plate, the second two-way driving cylinder is fixedly mounted on the top plate, the cam is vertically axially mounted on the center seat, the two output ends of the second two-way driving cylinder are transmission-connected with the two cams through a transmission connecting rod, the second two-way driving cylinder is located between the two cams, a flange is provided on the side of the cam close to the left base or the right base, the top plate is lifted and lowered on the quick-release base plate by a telescopic rod, there are two groups of connecting components, the two groups of connecting components are symmetrically arranged along the vertical center plane of the bracket base, the connecting component includes a second bottom lifting connecting arm and a second articulated seat, the second articulated seat is detachably mounted on the quick-release base plate, the center of the second bottom lifting connecting arm is axially connected to the second articulated seat, one end of the second bottom lifting connecting arm is transmission-connected to the left base or the right base, the other end of the second bottom lifting connecting arm is axially connected to the resistance block, and the resistance block is transmission-connected to the cam.

[0015] Preferably, a transmission groove is opened on the side wall of the left base and the right base close to the pushing frame, the transmission groove is horizontally arranged, and the length direction of the transmission groove is consistent with the length direction of the bracket base. A transmission column is fixedly provided on the side of the second bottom lifting connecting arm close to the left base or the right base, and the diameter of the transmission column is greater than the lateral opening width of the transmission groove. A removable cover plate is provided at the front end of the left base and the right base.

[0016] Preferably, the abutment block is abuttingly connected to the outer edge of the cam, and rotating rollers are axially connected to both ends of the abutment block on one side close to the cam.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The automatic bottom lifting device shown in the present invention enhances the adaptability of the device to complex working conditions, makes the bottom lifting action more accurate and smooth, and reduces the occurrence of jams and failures. It optimizes space utilization, and the horizontally arranged drive components, compact transmission connectors and reasonable layout effectively save vertical and horizontal space, which is particularly suitable for narrow and low working spaces in coal mines. It reduces the maintenance cost and difficulty of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of a first embodiment of an automatic bottom lifting device for a coal mine hydraulic support;

[0020] Figure 2 It is a partial three-dimensional structural schematic diagram of a first embodiment of an automatic bottom lifting device for a coal mine hydraulic support;

[0021] Figure 3 It is a three-dimensional structural schematic diagram of a second embodiment of an automatic bottom lifting device for a coal mine hydraulic support;

[0022] Figure 4 It is a partial three-dimensional structural schematic diagram of a second embodiment of an automatic bottom lifting device for a coal mine hydraulic support;

[0023] Figure 5 It is a three-dimensional structural schematic diagram of a third embodiment of an automatic bottom lifting device for a coal mine hydraulic support;

[0024] Figure 6 It is a front view of a third embodiment of an automatic bottom lifting device for a coal mine hydraulic support;

[0025] Figure 7 It is a three-dimensional structural schematic diagram of a fourth embodiment of an automatic bottom lifting device for a coal mine hydraulic support;

[0026] Figure 8 It is a front view of a fourth embodiment of an automatic bottom lifting device for a coal mine hydraulic support;

[0027] Fig. 9 The present invention is a partial three-dimensional structural schematic diagram of a fourth embodiment of an automatic bottom lifting device for a coal mine hydraulic support.

[0028] The numbers in the figure are:

[0029] 1. Left base; 2. Right base; 3. Bracket base; 4. Sliding frame; 5. Driving assembly; 6. Transmission assembly; 7. Connecting assembly; 8. Quick-release base plate; 9. Top plate; 10. Transmission connecting piece; 11. First hinged rod; 12. First hinged seat; 13. First transmission plate; 14. First two-way driving oil cylinder; 15. First bottom lifting connecting arm; 16. Sliding block; 17. Sliding guide rail; 18. Second hinged rod; 19. Bottom lifting jack; 20. Cam; 21. Center seat; 22. Resistance block; 23. Second two-way driving oil cylinder; 24. Flange; 25. Telescopic rod; 26. Second bottom lifting connecting arm; 27. Second hinged seat; 28. Transmission groove; 29. ​​Transmission column; 30. Removable cover plate; 31. Rotating roller. DETAILED DESCRIPTION

[0030] In order to further understand the features, technical means, specific objectives and functions of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0031] like Figure 1-9The shown embodiment is an automatic bottom lifting device for a coal mine hydraulic support, the hydraulic support comprises a symmetrically arranged left base 1 and a right base 2, the left base 1 and the right base 2 are combined to form a support base 3, a push frame 4 is provided between the left base 1 and the right base 2, the automatic bottom lifting device comprises a horizontally arranged driving assembly 5, a transmission assembly 6 detachably mounted on the push frame 4 and a connecting assembly 7 for pulling and lifting the support base 3, the length direction of the driving assembly 5 is arranged perpendicular to the length direction of the support base 3, the output end of the driving assembly 5 is transmission-connected to the transmission assembly 6, the transmission assembly 6 comprises a quick-release bottom plate 8, a top plate 9 and a transmission connecting member 10, the quick-release bottom plate 8 is detachably mounted on the push frame 4, the top plate 9 is slidingly connected to the quick-release bottom plate 8, the transmission connecting member 10 is installed between the quick-release bottom plate 8 and the top plate 9, the transmission connecting member 10 is transmission-connected to the connecting assembly 7, and the connecting assembly 7 is hinged to the left base 1 and the right base 2, respectively.

[0032] During coal mining operations, the automatic bottom lifting device of the coal mine hydraulic support starts to operate. The horizontally arranged driving assembly 5 is started, and its output end generates power and transmits it to the transmission assembly 6. The quick-release base plate 8 in the transmission assembly 6 is detachably mounted on the push frame 4, which plays an important supporting role and provides a stable foundation for subsequent lifting actions. When the power of the driving assembly 5 is transmitted to the transmission connector 10, the power is further transmitted to the connecting assembly 7 through its transmission action. The connecting assembly 7 is hinged to the left base 1 and the right base 2 respectively, thereby pulling the left base 1 and the right base 2 to realize the upward lifting action of the support base 3 relative to the push frame 4.

[0033] The horizontally arranged drive assembly 5 saves vertical space, and is particularly suitable for mining environments with extremely thin coal seams, solving the problem of large space occupied by the traditional vertically arranged bottom lifting device. The removable quick-release bottom plate 8 facilitates the installation, maintenance and replacement of the equipment, and improves the maintainability and service life of the equipment. The coordinated work of the transmission assembly 6 and the connection assembly 7 makes the bottom lifting action more stable and reliable, and improves the working efficiency and safety of the hydraulic support. The overall structural design is reasonable, which can effectively avoid component damage caused by harsh environment, and reduce maintenance costs and downtime.

[0034] In the first embodiment of the present invention:

[0035] There are two groups of transmission connecting members 10, and the two transmission connecting members 10 are symmetrically arranged along the vertical center plane of the bracket base 3. The transmission connecting member 10 is composed of a first hinged rod 11, a first hinged seat 12 and a first transmission plate 13. The first hinged seat 12 is fixedly installed on the quick-release base plate 8, one end of the first hinged rod 11 is hinged on the first hinged seat 12, and the other end of the first hinged rod 11 is hinged to the first transmission plate 13, the first transmission plate 13 is transmission connected to the top plate 9, and the driving assembly 5 is transmission connected to the first transmission plate 13.

[0036] In the automatic bottom lifting device of the coal mine hydraulic support, one end of the first hinged rod 11 is connected to the first hinged seat 12 by an articulated manner, so that it can rotate relatively. The other end of the first hinged rod 11 is also connected to the first transmission plate 13 by an articulated manner. There is a transmission connection relationship between the first transmission plate 13 and the top plate 9, and the drive assembly 5 is in transmission connection with the first transmission plate 13. This compact design effectively saves the space occupied by the device, especially in the limited working space underground in the coal mine. It has significant advantages.

[0037] In the actual working process, when the driving assembly 5 generates power and transmits it to the first transmission plate 13, it drives the first hinged rod 11 to rotate, thereby driving the first transmission plate 13 to perform corresponding actions. The action of the first transmission plate 13 is further transmitted through the transmission connection with the top plate 9, and the top plate 9 drives the bracket base 3 to perform the bottom lifting operation through the connecting assembly 7, and finally realizes the transmission effect on the entire device.

[0038] This symmetrically arranged and compact transmission connector 10 not only ensures uniform distribution of force and balanced and stable movement during the transmission process, but also facilitates daily maintenance work due to the quick-release base plate 8 and reasonable structural layout, and effectively saves the space required for installation and operation, greatly improving the working efficiency and reliability of the entire automatic bottom lifting device.

[0039] The first bidirectional drive oil cylinder 14 is started, and its two output ends perform telescopic movements at the same time. The telescopic force of its output ends can be directly and effectively transmitted to the first transmission plate 13. The first transmission plate 13 performs vertical displacement while moving horizontally, that is, the first transmission plate 13 has an inclined motion trajectory when displacing. During this movement, it can drive the top plate 9 connected to it to achieve the lifting function. It is worth mentioning that during the movement of the top plate 9, it will slide and displace in the vertical direction with the quick-release bottom plate 8. The design of the first bidirectional drive oil cylinder 14 being located between the two first transmission plates 13 makes the structure of the entire device compact, which not only reduces space occupancy, but also provides convenience for maintenance work.

[0040] The connecting component 7 is two first bottom lifting connecting arms 15, which are symmetrically arranged along the vertical plane of the bracket base 3. One end of the first bottom lifting connecting arm 15 is hinged to the top plate 9, and the other ends of the two first bottom lifting connecting arms 15 are respectively hinged to the top of the left base 1 and the right base 2.

[0041] When the device is working, the first two-way driving oil cylinder 14 is started, driving the first transmission plate 13 to move, and then the top plate 9 moves. Due to the hinged relationship between the first bottom lifting connecting arm 15 and the top plate 9, the movement of the top plate 9 is transmitted to the first bottom lifting connecting arm 15, so that the first bottom lifting connecting arm 15 pulls the left base 1 and the right base 2 to achieve the lifting action of the base. This symmetrical arrangement of the first bottom lifting connecting arm 15 can ensure that the left base 1 and the right base 2 are lifted synchronously and smoothly, making the entire bottom lifting process more stable and reliable.

[0042] The transmission connection 10 also includes a slider 16 and a sliding guide rail 17. The slider 16 is fixedly connected to one end of the first transmission plate 13 close to the top plate 9. The sliding guide rail 17 is fixedly installed on the top plate 9. The length direction of the sliding guide rail 17 is consistent with the length direction of the driving component 5. The slider 16 is slidably connected to the top plate 9 through the sliding guide rail 17.

[0043] When the device starts to run, the first transmission plate 13 starts to move under the driving force. At this time, the slider 16 fixedly connected to the first transmission plate 13 slides along the sliding guide rail 17 on the top plate 9. The horizontal displacement of the first transmission plate 13 is guided and limited by the slider 16 and the sliding guide rail 17. In this process, the top plate 9 can be lifted by the slider 16 to transmit the power to the top plate 9. This sliding action makes the movement of the first transmission plate 13 more stable and smooth, avoiding possible jamming or instability.

[0044] In the second embodiment of the present invention:

[0045] The transmission connecting member 10 also includes a second hinged rod 18, one end of the second hinged rod 18 is hinged to an end of the first transmission plate 13 away from the first hinged rod 11, and the other end of the second hinged rod 18 is hinged to an end of the top plate 9 close to the left base 1 or the right base 2. The length of the first hinged rod 11 is consistent with that of the second hinged rod 18.

[0046] In the second embodiment, the difference from the first embodiment is that the first transmission plate 13 in the second embodiment is connected to the top plate 9 by means of the second hinged rod 18. In the first embodiment, since the transmission connection position between the first transmission plate 13 and the top plate 9 will slide and change, when the slider 16 slides to the middle position, it is easy to cause an unbalanced condition of the transmission force to the top plate 9, thereby causing an adverse effect on the transmission process of the connecting assembly 7, and finally may interfere with the effectiveness of the bottom lifting operation. In the second embodiment, since the two ends of the second hinged rod 18 are respectively hinged to the first transmission plate 13 and the top plate 9, the connection position of the second hinged rod 18 and the top plate 9 is fixed during the entire bottom lifting operation, and this connection method avoids the uncertainty and instability caused by sliding. During the transmission process, the force can be transmitted from the first transmission plate 13 to the top plate 9 more directly and smoothly, effectively reducing the loss and uneven distribution of force caused by sliding.

[0047] In the second embodiment, when the first transmission plate 13 moves, the second articulated rod 18 can always maintain a stable transmission angle and force transmission direction, effectively ensuring that the force received by the top plate 9 is uniform and continuous. Compared with the first embodiment, the stability and reliability of the transmission are improved, the efficient and accurate bottom lifting operation is ensured, the equipment failures and operation problems caused by unbalanced transmission force are reduced, and the adaptability and stability of the entire device under complex working conditions are enhanced.

[0048] In the third embodiment of the present invention:

[0049] The driving assembly 5 is two horizontally arranged bottom lifting jacks 19, which are respectively arranged on the left base 1 and the right base 2. One end of the bottom lifting jack 19 is hinged to the left base 1 or the right base 2, and the output end of the bottom lifting jack 19 is fixedly connected to the side wall of the first transmission plate 13 close to the bottom lifting jack 19.

[0050] In the third embodiment of the present invention, unlike the design in which the first bidirectional driving oil cylinder 14 is located between the two first transmission plates 13 in the first embodiment, the driving assembly 5 in the third embodiment adopts two horizontally arranged bottom lifting jacks 19. One end of the bottom lifting jack 19 is hinged to the left base 1 or the right base 2 to remain fixed, and its output end is hinged to the side wall of the first transmission plate 13 close to the bottom lifting jack 19, so as to transmit the force generated by the telescopic movement to the first transmission plate 13. The two bottom lifting jacks 19 respectively arranged on the left base 1 and the right base 2 are more independent and can independently provide power for both sides of the base, so that the bottom lifting action is more flexible and adaptable to different working conditions. Secondly, the horizontal setting saves vertical space and has better spatial adaptability, which is particularly suitable for the low and narrow working space in the coal mine. Furthermore, this layout mode has improved fault tolerance. If one of them fails, the other can still maintain part of the bottom lifting function, reducing the risk of complete shutdown of the equipment. At the same time, the individual jacks are easier to disassemble and replace, and maintenance is more convenient, which reduces the difficulty and time cost of maintenance. The power distribution is more flexible, and the output force of the jacks on the left and right sides can be flexibly adjusted according to actual needs, making the bottom lifting action more suitable for specific working conditions.

[0051] In the fourth embodiment of the present invention:

[0052] The transmission connecting member 10 is provided with two groups and is symmetrically arranged along the vertical center plane of the bracket base 3. The transmission connecting member 10 is composed of a cam 20, a center seat 21 and a resistance block 22. The driving component 5 is a second two-way driving cylinder 23. The center seat 21 is fixedly mounted on the quick-release bottom plate 8. The second two-way driving cylinder 23 is fixedly mounted on the top plate 9. The cam 20 is vertically axially mounted on the center seat 21. The two output ends of the second two-way driving cylinder 23 are transmission-connected with the two cams 20 through a transmission connecting rod. The second two-way driving cylinder 23 is located between the two cams 20. One side of the cam 20 close to the left base 1 or the right base 2 A flange 24 is provided on the side, and the top plate 9 can be lifted and lowered on the quick-release base plate 8 through a telescopic rod 25. There are two groups of connecting components 7, and the two groups of connecting components 7 are symmetrically arranged along the vertical center plane of the bracket base 3. The connecting component 7 includes a second bottom lifting connecting arm 26 and a second hinge seat 27. The second hinge seat 27 is detachably installed on the quick-release base plate 8. The center of the second bottom lifting connecting arm 26 is axially connected to the second hinge seat 27. One end of the second bottom lifting connecting arm 26 is transmission-connected to the left base 1 or the right base 2, and the other end of the second bottom lifting connecting arm 26 is axially connected to the resistance block 22, and the resistance block 22 is transmission-connected to the cam 20.

[0053] In the fourth embodiment of the present invention, the transmission connecting member 10 is composed of a cam 20, a center seat 21 and a resistance block 22, and the driving component 5 is a second bidirectional driving cylinder 23. During the transmission process, the output end of the second bidirectional driving cylinder 23 is transmission-connected to the cam 20 mounted on the center seat 21 via a transmission connecting rod. When the two output ends of the second bidirectional driving cylinder 23 are extended and retracted at the same time, the two cams 20 are driven to rotate in opposite directions through the transmission connecting rod. The flange 24 on the cam 20 interacts with the resistance block 22 during rotation, thereby driving the connecting component 7 to move. When the cam 20 rotates, the resistance block 22 pushes the second bottom lifting connecting arm 26, and one end of the second bottom lifting connecting arm 26 is transmission-connected to the left base 1 or the right base 2, thereby realizing the bottom lifting action.

[0054] The fourth embodiment shown in the present invention has a compact overall structure and occupies a small space, and is adaptable to the complex working environment underground in coal mines. The second bottom lifting connecting arm 26 in the connecting assembly 7 can be designed in a V-shape, and a part of the second bottom lifting connecting arm 26 is placed inside the bracket base 3, which further reduces the space occupied by the bottom lifting device and can ensure sufficient strength.

[0055] A transmission groove 28 is opened on the side wall of the left base 1 and the right base 2 near the push frame 4. The transmission groove 28 is horizontally arranged, and the length direction of the transmission groove 28 is consistent with the length direction of the bracket base 3. A transmission column 29 is fixedly provided on the side of the second bottom lifting connecting arm 26 near the left base 1 or the right base 2. The diameter of the transmission column 29 is greater than the lateral opening width of the transmission groove 28. A removable cover plate 30 is provided at the front end of the left base 1 and the right base 2.

[0056] During the transmission process, when the second bottom lifting connecting arm 26 moves, its fixed transmission column 29 slides in the transmission groove 28, thereby transmitting force to the left base 1 and the right base 2, and realizing the bottom lifting function. The cooperation between the transmission column 29 and the transmission groove 28 ensures the accurate transmission and direction control of force. Since the diameter of the transmission column 29 is greater than the lateral opening width of the transmission groove 28, the transmission column 29 is effectively prevented from escaping from the transmission groove 28, thereby ensuring the stability and reliability of the transmission. It is particularly worth mentioning that the design of the transmission groove 28 is not only used for the transmission of force, but also mainly for the convenience of installing and removing the connection component 7. This design makes it easier to operate when the connection component 7 needs to be maintained or replaced, reducing operation time and labor costs.

[0057] The abutment block 22 is abutted against the outer edge of the cam 20 , and rotating rollers 31 are axially connected to both ends of the abutment block 22 on one side close to the cam 20 .

[0058] During the transmission process, when the cam 20 rotates, its outer edge contacts and pushes the resistance block 22. The resistance block 22 is driven to move by the flange 24. Since the rotating rollers 31 on the resistance block 22 close to the cam 20 are axially connected at both ends, the friction between the resistance block 22 and the cam 20 is reduced, making the transmission smoother. The design of the rotating roller 31 reduces friction loss and prolongs the service life of the components.

[0059] The overall working principle of the present invention:

[0060] Embodiment 1:

[0061] The first bidirectional driving oil cylinder 14 is located between the two first transmission plates 13. When started, its output end is extended and retracted, directly acting on the first transmission plate 13, and the first hinge rod 11 is driven to deflect through the first transmission plate 13. The running track of the first transmission plate 13 is set tilted, and the movement track of the first transmission plate 13 can be decomposed. The displacement in the horizontal direction is coordinated by the slider 16 fixedly connected to the first transmission plate 13 and the sliding guide 17 fixedly connected to the top plate 9, and in this process, the top plate 9 is driven, so that the top plate 9 moves in the vertical direction, and then drives the top plate 9 connected to it to rise and fall, and transmits power to the top plate 9. The top plate 9 is then hinged with the first bottom lifting connecting arm 15, so that the first bottom lifting connecting arm 15 pulls the left base 1 and the right base 2 to realize the lifting action of the bracket base 3. The structure is compact, space-saving, conducive to limited space operation underground, and convenient for maintenance.

[0062] Embodiment 2:

[0063] The first transmission plate 13 is connected to the top plate 9 through the second hinge rod 18. During the power transmission process, the movement of the first transmission plate 13 is directly transmitted to the top plate 9 through the second hinge rod 18, avoiding instability caused by sliding. Then, the top plate 9 transmits the force to the first bottom lifting connecting arm 15, driving the base to lift up. This avoids uneven transmission force, improves transmission stability, and ensures accurate and efficient bottom lifting operations.

[0064] Embodiment three:

[0065] Two horizontally arranged bottom lifting jacks 19 work on the left base 1 and the right base 2 respectively. When started, the bottom lifting jacks 19 extend and retract, and the output end thereof transmits force to the first transmission plate 13 through the hinge connection with the first transmission plate 13. The first transmission plate 13 then lifts the support base 3 through the top plate 9 and the first bottom lifting connecting arm 15. The two independently arranged bottom lifting jacks 19 are highly independent and adaptable to different working conditions; they have high fault tolerance; they are convenient for maintenance; and they have flexible power distribution.

[0066] Embodiment 4:

[0067] The two output ends of the second bidirectional driving oil cylinder 23 output synchronously, and drive the cam 20 connected to the center seat 21 with the vertical axis to rotate through the transmission connecting rod. The flanges 24 on both sides of the cam 20 interact with the resistance block 22 to push the resistance block 22. The movement of the resistance block 22 drives the second bottom lifting connecting arm 26, and the second bottom lifting connecting arm 26 is connected to the left base 1 or the right base 2 through the transmission connection to realize the lifting of the bracket base 3. The structure is compact, occupies a small space, and is suitable for the complex environment underground; the connection component 7 can adopt a V-shaped design to reduce space and ensure strength; it is convenient to install and disassemble the connection component 7, and reduce maintenance costs.

[0068] The above embodiments only express one or several implementation modes of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A coal mine hydraulic support automatic bottom lifting device, the hydraulic support comprises a symmetrically arranged left base and a right base, the left base and the right base are combined to form a support base, a push frame is arranged between the left base and the right base, characterized in that: The automatic bottom lifting device includes a horizontally arranged driving assembly, a transmission assembly detachably mounted on the push frame, and a connecting assembly for pulling and lifting the support base. The length direction of the driving assembly is perpendicular to the length direction of the support base. The output end of the driving assembly is connected to the transmission assembly in a transmission manner. The transmission assembly includes a quick-release bottom plate, a top plate, and a transmission connecting piece. The quick-release bottom plate is detachably mounted on the push frame. The top plate is slidably connected to the quick-release bottom plate. The transmission connecting piece is mounted between the quick-release bottom plate and the top plate. The transmission connecting piece is connected to the connecting assembly in a transmission manner. The connecting assembly is hinged to the left base and the right base respectively. The transmission connecting parts are provided with two groups and are symmetrically arranged along the vertical center plane of the bracket base. The transmission connecting parts are composed of a cam, a center seat and a resistance block. The driving assembly is a second two-way driving oil cylinder, the center seat is fixedly mounted on the quick-release base plate, the second two-way driving oil cylinder is fixedly mounted on the top plate, the cam is vertically axially mounted on the center seat, the two output ends of the second two-way driving oil cylinder are transmission connected with the two cams through a transmission connecting rod, the second two-way driving oil cylinder is located between the two cams, a flange is provided on one side of the cam close to the left base or the right base, the top plate is lifted and mounted on the quick-release base plate by a telescopic rod, the connecting assembly is provided with two groups, the two groups of connecting assemblies are symmetrically arranged along the vertical center plane of the bracket base, the connecting assembly includes a second bottom lifting connecting arm and a second articulated seat, the second articulated seat is detachably mounted on the quick-release base plate, the center of the second bottom lifting connecting arm is axially connected to the second articulated seat, one end of the second bottom lifting connecting arm is transmission connected with the left base or the right base, the other end of the second bottom lifting connecting arm is axially connected to the resistance block, and the resistance block is transmission connected with the cam; A transmission groove is opened on the side wall of the left base and the right base on the side close to the pushing frame. The transmission groove is horizontally arranged, and the length direction of the transmission groove is consistent with the length direction of the bracket base. A transmission column is fixedly provided on the side of the second bottom lifting connecting arm close to the left base or the right base. The diameter of the transmission column is greater than the lateral opening width of the transmission groove. A removable cover plate is provided at the front end of the left base and the right base.

2. The automatic bottom lifting device of a coal mine hydraulic support according to claim 1 is characterized in that: The abutment block is abuttingly connected with the outer edge of the cam, and rotating rollers are axially connected on both ends of one side of the abutment block close to the cam.

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