High-precision roof breaking device for coal mine goaf

Abstract

A kind of coal mine goaf high-precision disassembly and assembly roof breaking device, including roof breaking component, roof breaking component includes column seat, column jack, impact column, first ball hinge joint, second ball hinge joint, impact column is connected with column seat, column jack is connected with column seat or impact column by second ball hinge joint, second ball hinge joint includes second connecting rod, second ball head, second ball seat, second ball cover, two ends of second connecting rod are connected with column jack and second ball head respectively, second ball seat is connected with column seat or impact column, second ball hinge joint includes at least two pin joint assemblies, pin joint assembly includes cylindrical pin and fourth pin hole opened in second ball seat and fifth pin hole opened in second ball cover, based on the precise cooperation of cylindrical pin with fourth pin hole and fifth pin hole, second ball cover is guided and accurately positioned with second ball seat by two pin joint assemblies, second ball head, second ball seat, second ball cover are accurately aligned, avoid eccentric and eccentric wear.

Description

Technical Field

[0001] This utility model relates to the field of coal mine roof breaking technology, and in particular to a high-precision re-disassembly and reassembly roof breaking device for coal mine goaf areas. Background Technology

[0002] If the roof of the goaf in the longwall mining face of a coal mine does not collapse or the overhang distance exceeds the provisions of the operating procedures, coal mining must be stopped and manual forced roof caving or other measures must be taken to deal with the situation.

[0003] Authorized publication number CN119288483B discloses a coal caving end support for a top coal caving face, including a support body and a roof breaking device. The support body includes a top beam and a base; the roof breaking device includes a column base, an impact column, and a column jack; the column base is connected to the rear of the base, the impact column is rotatably mounted on the column base, and the column jack is connected between the column base and the impact column. The column jack is used to adjust the pitch angle of the column jack, and the impact column can realize roof breaking operation.

[0004] The end support uses a single column jack, which can only achieve the forward and backward swinging of the impact column. To expand the impact column's breaking range and enable its left and right swinging, the design incorporates one or more column jacks, connected to the impact column using a ball joint. The column jacks then drive the impact column to swing. Taking an adjustable precision ball joint disclosed in patent publication number CN216554929U as an example, the adjustable precision ball joint includes a ball head, a ball seat, a ball cap, and fastening bolts connecting the ball seat and the ball cap. Several fastening bolts are typically used to fasten the ball seat and the ball cap. During initial or reinstallation of the ball cap, it is difficult to maintain consistency in the tightening degree and sequence of the fastening bolts, resulting in low repeatability and some degree of eccentricity between the ball head and the ball seat, causing uneven wear. Summary of the Invention

[0005] In view of this, and to address the above-mentioned shortcomings, it is necessary to propose a high-precision re-disassembly and roof-breaking device for coal mine goaf areas.

[0006] A high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas includes a roof-breaking assembly. The roof-breaking assembly includes a column base, column jacks, an impact column, a first ball joint, and a second ball joint. The fixed end of the impact column is connected to the column base via the first ball joint, and the telescopic end of the impact column extends freely upwards. At least two column jacks are arranged circumferentially along the impact column. The fixed end of each column jack is connected to the column base via the second ball joint, and the telescopic end of each column jack is connected to the fixed end of the impact column via the second ball joint. The second ball joint includes a second connecting rod, a second ball head, a second ball seat, and a second ball cap. The first end of the second connecting rod is connected to either the fixed end or the telescopic end of the column jack. The second end of the two connecting rod is connected to the second ball head. The bottom surface of the second ball seat is connected to the fixed end of the column seat or impact column. The top surface of the second ball seat is provided with a hemispherical socket. The diameter of the second ball head is equal to the diameter of the socket of the second ball seat. The second ball cap is provided with a mounting hole for fitting the second connecting rod. The mounting hole of the second ball cap is larger than the outer diameter of the second connecting rod, and the diameter of the mounting hole of the second ball cap is smaller than the diameter of the second ball head. The second ball joint includes at least two pin assemblies. The pin assembly includes a cylindrical pin and a fourth pin hole in the second ball seat and a fifth pin hole in the second ball cap. The cylindrical pin passes through the fourth pin hole and the fifth pin hole in sequence. The cylindrical pin is interference-fitted with both the fourth pin hole and the fifth pin hole.

[0007] Preferably, the pin assembly includes a sixth pin hole in the second ball seat, and the cylindrical pin is sequentially inserted into the fourth pin hole, the fifth pin hole, and the sixth pin hole, with the cylindrical pin having an interference fit with the fourth pin hole, the fifth pin hole, and the sixth pin hole.

[0008] Preferably, the second ball joint includes a three-pin assembly, wherein the axes of the cylindrical pins of any two pin assemblies are parallel to each other.

[0009] Preferably, a column jack is installed at each of the three quarter points around the circumference of the impact column.

[0010] Preferably, a column jack is installed at each of the four quarter points around the circumference of the impact column.

[0011] Preferably, the top-breaking component includes a sliding sleeve that can slide along the axial direction of the impact column, and the bottom surface of the second ball seat is connected to the sliding sleeve.

[0012] Preferably, the high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas includes a unit support, which includes a top beam and a support jack. The telescopic end of the support jack is connected to the top beam, and the fixed end of the support jack is connected to the column base.

[0013] Preferably, the top beam is connected to the telescopic end of the supporting jack by a first ball joint, and the column base is connected to the fixed end of the supporting jack by a first ball joint.

[0014] Preferably, the first ball joint includes a first ball cap, a pressure plate, a first ball head, and a first connecting rod. The first ball head is connected to one end of the first connecting rod, and the other end of the first connecting rod is connected to the fixed end of the impact column. The column base is provided with a hemispherical recess with the same diameter as the first ball head. The first ball cap is provided with an installation hole that can be fitted onto the first connecting rod. The diameter of the installation hole of the first ball cap is larger than the outer diameter of the first connecting rod, and the diameter of the installation hole of the first ball cap is smaller than the diameter of the first ball head. The pressure plate is fixed on the column base, and the first ball cap is clamped between the pressure plate and the column base.

[0015] Preferably, a pressure plate is provided on each side of the ball cover.

[0016] Beneficial effects: Based on the precise fit between the cylindrical pin and the fourth and fifth pin holes, the second ball cap is guided by the two pin connection components and precisely positioned with the second ball seat. After the second ball cap is removed from the second ball seat and reinstalled, the second ball head, the second ball seat, and the second ball cap are precisely aligned, avoiding eccentricity and uneven wear. Attached Figure Description

[0017] Figure 1 This is an isometric drawing of the high-precision reassembly and disassembly roof-breaking device for the goaf area of ​​the coal mine.

[0018] Figure 2 This is an isometric view of the second ball joint in its first disassembled state.

[0019] Figure 3 This is an isometric view of the second ball joint in its second disassembled state.

[0020] Figure 4 This is an isometric view of the second ball joint in the third disassembled state.

[0021] Figure 5 This is a schematic diagram of the first installation state of the first ball cover.

[0022] Figure 6 This is a schematic diagram of the second installation state of the first ball cover.

[0023] Figure 7 This is a schematic diagram showing the connection relationship between the first ball cover, pressure plate, and pin.

[0024] Figure 8 This is a schematic diagram showing the connection between the U-shaped clip and the pressure plate.

[0025] Figure 9 This is a schematic diagram of the pin structure.

[0026] Figure 10 This is the front view of the convex block.

[0027] Figure 11 This is a top view of the bump.

[0028] Figure 12 This is a schematic diagram of the U-shaped card.

[0029] In the diagram: 10 top-breaking component, 11 column base, 12 column jack, 13 impact column, 14 first ball joint, 141 first ball head, 142 first connecting rod, 143 first ball cover, 144 pressure plate, 1441 locking hole, 145 pin, 1451 locking groove, 146 U-shaped clip, 15 second ball joint, 151 second ball base, 152 second ball cover, 153 cylindrical pin, 154 second connecting rod, 155 second ball head, 20 unit bracket, 21 top beam, 22 support jack. Detailed Implementation

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] See Figures 1 to 4 This utility model provides a high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas, including a roof-breaking component 10. The roof-breaking component 10 includes a column base 11, column jacks 12, an impact column 13, a first ball joint 14, and a second ball joint 15. The fixed end of the impact column 13 is connected to the column base 11 by the first ball joint 14, and the telescopic end of the impact column 13 extends freely upward. At least two column jacks 12 are arranged circumferentially along the impact column 13. The fixed end of the column jack 12 is connected to the column base 11 by the second ball joint 15, and the telescopic end of the column jack 12 is connected to the fixed end of the impact column 13 by the second ball joint 15. The second ball joint 15 includes a second connecting rod 154, a second ball head 155, a second ball seat 151, and a second ball cap 152. The first end of the second connecting rod 154 is connected to the fixed end of the column jack 12. Alternatively, the telescopic end can be connected. The second end of the second connecting rod 154 is connected to the second ball head 155. The bottom surface of the second ball seat 151 is connected to the fixed end of the column seat 11 or the impact column 13. The top surface of the second ball seat 151 is provided with a hemispherical socket. The diameter of the second ball head 155 is equal to the diameter of the socket of the second ball seat 151. The second ball cover 152 is provided with a mounting hole that can be fitted into the second connecting rod 154. The mounting hole of the second ball cover 152 is larger than the outer diameter of the second connecting rod 154, and the diameter of the mounting hole of the second ball cover 152 is smaller than the diameter of the second ball head 155. The second ball hinge joint 15 includes at least two pin assembly components. The pin assembly includes a cylindrical pin 153 and a fourth pin hole opened in the second ball seat 151 and a fifth pin hole opened in the second ball cover 152. The cylindrical pin 153 passes through the fourth pin hole and the fifth pin hole in sequence. The cylindrical pin 153 is interference-fitted with both the fourth pin hole and the fifth pin hole.

[0032] The second ball seat 151 and the second ball cover 152 are fixed relative to each other by two pin-connected components. Compared with the fastening bolt connection, the adjustment range of the gap between the second ball seat 151 and the second ball cover 152 is sacrificed in exchange for the precise positioning between the second ball seat 151 and the second ball cover 152.

[0033] The second ball seat 151 and the second ball cover 152 are fixed relative to each other by a three-pin connection assembly. Based on the design concept of "over-positioning", the redundant design improves safety and the extremely high machining precision is used to obtain an extremely stable triangular support structure.

[0034] For example, the impact column 13 is a jack, and a cone-shaped breaker hammer is installed at the telescopic end of the impact column 13. Its specific structure is not limited.

[0035] Beneficial effects: Based on the precise fit between the cylindrical pin 153 and the fourth and fifth pin holes, the second ball cap 152 is guided by the two pin connection components and precisely positioned with the second ball seat 151. After the second ball cap 152 is disassembled from the second ball seat 151 and reinstalled, the second ball head 155, the second ball seat 151, and the second ball cap 152 are precisely aligned, avoiding eccentricity and uneven wear.

[0036] The range of impact column 13 can also be expanded by moving the column base 11 left and right. However, the column base 11 has poor stability when facing complex bottom surfaces.

[0037] See Figures 1 to 4 Furthermore, the pin assembly includes a sixth pin hole opened in the second ball seat 151, and a cylindrical pin 153 sequentially passes through the fourth pin hole, the fifth pin hole, and the sixth pin hole, with the cylindrical pin 153 having an interference fit with the fourth pin hole, the fifth pin hole, and the sixth pin hole.

[0038] See Figures 1 to 4 Furthermore, the second ball joint 15 includes a three-pin assembly, wherein the axes of the cylindrical pins 153 of any two pin assemblies are parallel to each other.

[0039] See Figures 1 to 4 Furthermore, a column jack 12 is installed at each of the three quarter points around the impact column 13.

[0040] See Figures 1 to 4 Furthermore, a column jack 12 is installed at each of the four quarter points around the impact column 13.

[0041] See Figures 1 to 4 Furthermore, the top-breaking component 10 includes a sliding sleeve that can slide along the axial direction of the impact column 13, and the bottom surface of the second ball seat 151 is connected to the sliding sleeve.

[0042] The addition of a sliding sleeve can prevent the impact column 13 from detaching from the column base 11 under the combined force of the column jack 12.

[0043] See Figures 1 to 4 Furthermore, the high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas includes a unit support 20, which includes a top beam 21 and a support jack 22. The telescopic end of the support jack 22 is connected to the top beam 21, and the fixed end of the support jack 22 is connected to the column base 11.

[0044] The support jack 22 is hinged to the column base 11 and the top beam 21, and can also be rotatably connected. The support jack 22 can swing back and forth and left and right relative to the column base 11 or the top beam 21.

[0045] See Figures 1 to 4 Furthermore, the top beam 21 is connected to the telescopic end of the supporting jack 22 by the first ball joint 14, and the column base 11 is connected to the fixed end of the supporting jack 22 by the first ball joint 14.

[0046] In one embodiment, the unit support 20 includes clamps, and the supporting jack 22 is connected to the column base 11 via the clamps. The clamp structure can adopt an existing design.

[0047] The support jack 22 extends, the top beam 21 supports the top plate, and the angle of the impact column 13 is adjusted by the column jack 12. The impact column 13 extends, driving the breaker to carry out the roof breaking operation.

[0048] See Figures 1 to 4 Furthermore, the first ball joint 14 includes a first ball cap 143, a pressure plate 144, a first ball head 141, and a first connecting rod 142. The first ball head 141 is connected to one end of the first connecting rod 142, and the other end of the first connecting rod 142 is connected to the fixed end of the impact column 13. The column base 11 is provided with a hemispherical recess with the same diameter as the first ball head 141. The first ball cap 143 is provided with an installation hole that can be fitted into the first connecting rod 142. The diameter of the installation hole of the first ball cap 143 is larger than the outer diameter of the first connecting rod 142, and the diameter of the installation hole of the first ball cap 143 is smaller than the diameter of the first ball head 141. The pressure plate 144 is fixed on the column base 11, and the first ball cap 143 is clamped between the pressure plate 144 and the column base 11.

[0049] See Figures 1 to 4 Furthermore, a pressure plate 144 is provided on each side of the ball cover.

[0050] For example, the first ball joint 14 can be a general ball joint structure, such as the structure of an adjustable precision ball joint disclosed in patent publication number CN216554929U, in which the ball seat and the ball cover are connected by a one-way fastening bolt.

[0051] For the ball joint structures listed above, the numerous fastening bolts make installation cumbersome, especially after they rust, making disassembly and reassembly even more difficult. However, the fixing method using pressure plate 144 greatly simplifies installation. Two straight edges are cut from both sides of the circular first ball cap 143, according to... Figure 5 Position the first ball cap 143 between the two pressure plates 144 as shown. Move the first ball cap 143 downwards so that the upper surface of the first ball cap 143 is lower than the lower surface of the pressure plate 144. Then rotate the first ball cap 143 90°. Figure 6 As shown, the first ball cover 143 is clamped between the column base 11 and the pressure plate 144.

[0052] For the ball joint structures listed above, the tightening of the fastening bolts is often uneven. When the impact column 13 is tilted and subjected to the combined force of the column jack 12, the first ball head 141 will exert local pressure on one side of the ball cap. Some fastening bolts will break first, and the other fastening bolts will be more likely to break, causing the impact column 13 to come out. However, by using the fixing method of the pressure plate 144, the pressure plate 144 bears the force as a whole, and its strength is higher than that of the fastening bolts.

[0053] For example, see Figures 7 to 12 The pressure plate 144, the first ball cap 143, and the column base 11 are respectively provided with a first pin hole, a second pin hole, and a third pin hole. The first and second pin holes are through holes, and the third pin hole is a countersunk hole. The pin shaft 145 passes through the first pin hole, the second pin hole, and the third pin hole in sequence. The pin shaft 145 is interference-fitted with the first pin hole, the second pin hole, and the third pin hole. The pressure plate 144 and the first ball cap 143 can be relatively fixed by the pin shaft 145. The pin shaft 145 and the pressure plate 144 are relatively fixed by the U-shaped clip 146, and a gap is left between the pressure plate 144 and the first ball cap 143. When the impact column 13 is dislodged by the combined force of the column jack 12, the first ball cap 143 will move along the pin shaft 145 to approach the pressure plate 144, thus buffering the damage to the first ball cap 143 and the pressure plate 144.

[0054] For example, see Figures 7 to 12 The pin 145 is provided with an annular groove 1451, and the pressure plate 144 has a protrusion with a first pin hole through it. The protrusion is provided with two parallel locking holes 1441 that pass through the first pin hole. The distance between the two locking holes 1441 is approximately equal to the diameter of the groove 1451. The pin 145 is inserted into the first pin hole, the second pin hole, and the third pin hole. The U-shaped clip 146 is inserted into the locking hole 1441 and locked into the groove 1451, which can prevent the pin 145 from coming out of the first pin hole, the second pin hole, and the third pin hole. The U-shaped clip 146 can be easily removed.

[0055] The modules or units in the device of this utility model embodiment can be merged, divided, or deleted according to actual needs.

[0056] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Those skilled in the art can understand that implementing all or part of the above-described embodiments and making equivalent changes in accordance with the claims of the present utility model are still within the scope of the utility model.

Claims

1. A high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas, characterized in that: The system includes a roof-breaking assembly comprising a column base, column jacks, an impact column, a first ball joint, and a second ball joint. The fixed end of the impact column is connected to the column base via the first ball joint, and the telescopic end of the impact column extends freely upwards. At least two column jacks are arranged circumferentially along the impact column. The fixed end of each column jack is connected to the column base via the second ball joint, and the telescopic end of each column jack is connected to the fixed end of the impact column via the second ball joint. The second ball joint includes a second connecting rod, a second ball head, a second ball seat, and a second ball cap. The first end of the second connecting rod is connected to either the fixed end or the telescopic end of the column jack, and the second end of the second connecting rod is connected to the first ball joint. The two ball joints are connected. The bottom surface of the second ball seat is connected to the fixed end of the column seat or impact column. The top surface of the second ball seat is provided with a hemispherical recess. The diameter of the second ball head is equal to the diameter of the recess of the second ball seat. The second ball cap is provided with a mounting hole for fitting the second connecting rod. The mounting hole of the second ball cap is larger than the outer diameter of the second connecting rod, and the diameter of the mounting hole of the second ball cap is smaller than the diameter of the second ball head. The second ball joint includes at least two pin assemblies. The pin assembly includes a cylindrical pin and a fourth pin hole in the second ball seat and a fifth pin hole in the second ball cap. The cylindrical pin passes through the fourth pin hole and the fifth pin hole in sequence. The cylindrical pin is interference-fitted with both the fourth pin hole and the fifth pin hole.

2. The high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas as described in claim 1, characterized in that: The pin assembly includes a sixth pin hole in the second ball seat, and the cylindrical pin is sequentially inserted into the fourth pin hole, the fifth pin hole, and the sixth pin hole, with the cylindrical pin having an interference fit with the fourth pin hole, the fifth pin hole, and the sixth pin hole.

3. The high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas as described in claim 1, characterized in that: The second ball joint includes a three-pin assembly, wherein the axes of the cylindrical pins of any two pin assemblies are parallel to each other.

4. The high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas as described in claim 1, characterized in that: A column jack is installed at each of the three quarter points around the circumference of the impact column.

5. The high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas as described in claim 1, characterized in that: A column jack is installed at each of the four quarter points around the circumference of the impact column.

6. The high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas as described in claim 1, characterized in that: The top-breaking assembly includes a sliding sleeve that can slide along the axial direction of the impact column, and the bottom surface of the second ball seat is connected to the sliding sleeve.

7. The high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas as described in claim 1, characterized in that: The high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas includes a unit support, which includes a top beam and a support jack. The telescopic end of the support jack is connected to the top beam, and the fixed end of the support jack is connected to the column base.

8. The high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas as described in claim 7, characterized in that: The top beam is connected to the telescopic end of the supporting jack by the first ball joint, and the column base is connected to the fixed end of the supporting jack by the first ball joint.

9. The high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas as described in claim 1, characterized in that: The first ball joint includes a first ball cap, a pressure plate, a first ball head, and a first connecting rod. The first ball head is connected to one end of the first connecting rod, and the other end of the first connecting rod is connected to the fixed end of the impact column. The column base is provided with a hemispherical recess with the same diameter as the first ball head. The first ball cap is provided with an installation hole that can be fitted onto the first connecting rod. The diameter of the installation hole of the first ball cap is larger than the outer diameter of the first connecting rod, and the diameter of the installation hole of the first ball cap is smaller than the diameter of the first ball head. The pressure plate is fixed on the column base, and the first ball cap is clamped between the pressure plate and the column base.

10. The high-precision re-disassembly and reassembly roof-breaking device for coal mine goaf areas as described in claim 9, characterized in that: A pressure plate is installed on each side of the ball cover.

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