A new type of liquid oxygen rock expansion cracking device

Abstract

The utility model relates to liquid oxygen rock fracturing device technical field especially a kind of novel expansion fracturing device of liquid oxygen rock, including controller, liquid oxygen tank one and flexible membrane sleeve, further include: connecting plate;Liquid oxygen tank two, liquid oxygen tank two side is equipped with electromagnetic three-way valve, connecting plate upside is equipped with A mounting hole and B mounting hole, A mounting hole inboard is equipped with feed pipe, B mounting hole inboard is equipped with exhaust pipe, and connecting unit is equipped between electromagnetic three-way valve and feed pipe and liquid oxygen tank one and liquid oxygen tank two;Ignition unit. By setting oxygen tank one, flexible membrane sleeve, liquid oxygen tank two, electromagnetic three-way valve, connecting unit, under the action of gas delivery pump, gasifier and electromagnetic three-way valve, liquid oxygen is converted into oxygen, then liquid oxygen in pipeline is emptied and flows into flexible membrane sleeve, reduce the damage suffered by pipeline, improve the delivery efficiency of liquid oxygen and the service life of pipeline.

Description

Technical Field

[0001] This utility model relates to the technical field of liquid oxygen rock fracturing devices, and in particular to a novel liquid oxygen rock expansion fracturing device. Background Technology

[0002] Liquid oxygen is the form of oxygen in a liquid state. A liquid oxygen rock fracturing device is a device that uses the phase change expansion of liquid oxygen to break rocks. The core principle is that the high-pressure gas generated by the combustion reaction between liquid oxygen and combustibles drives the rocks to crack.

[0003] In the prior art, according to Chinese patent application number 202420565229.9, a pressurized liquid oxygen phase change gas expansion rock-breaking device is disclosed, which includes a flexible membrane sleeve, an ignition device, a first liquid oxygen tank, a second liquid oxygen tank, and a vaporizer. The flexible membrane sleeve's rock-breaking process does not pollute the environment; moreover, the flexible membrane sleeve has a certain degree of flexibility, facilitating management and transportation, and poses no safety hazards from production to on-site deployment. Furthermore, the expansion capacity of the flexible membrane sleeve is controllable, ensuring the blasting effect. The first liquid oxygen tank and the vaporizer together provide pressurization to the second liquid oxygen tank, which serves as a liquid oxygen supply tank. No additional power is required; the pressurization method described above enables rapid and safe injection of liquid oxygen into the flexible membrane sleeve for subsequent liquid oxygen phase change expansion rock-breaking. The entire device does not involve any explosive or hazardous chemicals, reducing the additional power required for injection and decreasing the overall size of the device while ensuring the safety and efficiency of the liquid oxygen fracturing method for rock breaking.

[0004] In the prior art, according to Chinese patent application number 202420565229.9, a pressurized liquid oxygen phase change gas expansion rock-breaking device is disclosed. This device directly converts liquid oxygen in one liquid oxygen tank into oxygen to propel liquid oxygen in another liquid oxygen tank. During the transportation process, similar to traditional methods, liquid oxygen remains in the pipeline. This affects transportation efficiency, reducing the actual amount of liquid oxygen reaching the flexible membrane sleeve and decreasing the fracturing effect. Furthermore, prolonged retention of residual liquid oxygen in the pipeline leads to unstable pressure due to continuous vaporization, and the increased volume of the vaporized gas places an additional burden on the pipeline's capacity. Long-term use may cause pipeline deformation and damage, affecting the safety and service life of the device. Therefore, we propose a novel liquid oxygen rock expansion fracturing device to solve the above problems. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies. For example, Chinese Patent Application No. 202420565229.9 discloses a pressurized liquid oxygen phase change gas expansion rock-breaking device. This device directly converts liquid oxygen in one liquid oxygen tank into oxygen to propel liquid oxygen in another liquid oxygen tank. During transport, as with traditional methods, liquid oxygen remains in the pipeline. This affects transport efficiency, reducing the amount of liquid oxygen actually reaching the flexible membrane sleeve and decreasing the fracturing effect. Furthermore, prolonged retention of residual liquid oxygen in the pipeline leads to unstable pressure due to continuous vaporization, and the increased volume of the vaporized gas places an additional burden on the pipeline's capacity. Long-term use may cause pipeline deformation and damage, affecting the safety and lifespan of the device. Therefore, this invention proposes a novel liquid oxygen rock expansion fracturing device.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] Design a novel liquid oxygen-induced rock expansion fracturing device, including a controller, a liquid oxygen tank, and a flexible membrane sleeve, and further comprising:

[0008] The connecting plate has a through hole on the upper side of the flexible membrane sleeve. A connecting ring is fixedly connected to the inner wall of the through hole. The connecting ring is located on the lower side of the connecting plate, and the connecting ring and the connecting plate are detachably sealed by bolts evenly distributed in the circumference.

[0009] Liquid oxygen tank two, with an electromagnetic three-way valve on one side, and mounting holes A and B on the upper side of the connecting plate. A feed pipe is installed inside mounting hole A, and an exhaust pipe is installed inside mounting hole B. An electromagnetic valve A is installed at the upper end of the exhaust pipe, and the electromagnetic valve A and the electromagnetic three-way valve are connected to the power supply and controller through wires. A connecting unit is provided between the electromagnetic three-way valve, the feed pipe, liquid oxygen tank one, and liquid oxygen tank two. The connecting unit is used to directionally transport liquid oxygen into the flexible membrane sleeve.

[0010] An ignition unit is located between the inner side of the flexible membrane sleeve and the connecting plate, and the ignition unit is used to ignite the combustible material inside the flexible membrane sleeve.

[0011] Preferably, the connection unit includes a cryogenic liquid transfer pump and a gas transfer pump. A vaporizer is provided between the second liquid oxygen tank and the gas transfer pump. Connecting pipes are installed between the vaporizer inlet and the interface of the second liquid oxygen tank, between the vaporizer outlet and the inlet of the gas transfer pump, and between the cryogenic liquid transfer pump inlet and the interface of the first liquid oxygen tank. An A-connecting pipe is installed between the gas transfer pump outlet and the interface of the solenoid three-way valve. A B-connecting pipe is installed between the cryogenic liquid transfer pump outlet and the interface of the solenoid three-way valve. A B-solenoid valve is installed at the upper end of the feed pipe. A main connecting pipe is installed between the B-solenoid valve interface and the solenoid three-way valve interface. The cryogenic liquid transfer pump, the gas transfer pump, the vaporizer, and the B-solenoid valve are all connected to the controller and the power supply via wires.

[0012] By adopting the above structure, the connecting unit can deliver liquid oxygen into the flexible membrane sleeve, and under the action of the gas delivery pump, vaporizer and solenoid three-way valve, the liquid oxygen is replaced with oxygen, and then the oxygen slowly pushes the residual liquid oxygen in the pipeline to flow directionally into the flexible membrane sleeve.

[0013] Preferably, an auxiliary pipe is installed at the upper interface of the solenoid valve A.

[0014] By employing the above structure, the auxiliary tube is used to assist in the discharge of oxygen from the flexible membrane sleeve.

[0015] Preferably, the ignition unit includes a resistance wire ignition head, and the upper side of the connecting plate is provided with a C-mounting hole. An installation tube is detachably installed inside the C-mounting hole by means of threads. A high-temperature resistant flame-retardant wire is provided through the inner side of the installation tube. One end of the high-temperature resistant flame-retardant wire is connected to the resistance wire ignition head, and the other end of the high-temperature resistant flame-retardant wire is connected to the power supply and the controller. The high-temperature resistant flame-retardant wire and the inner side of the installation tube are provided with positioning parts.

[0016] By adopting the above structure, the ignition unit is used to ignite the combustible material inside the flexible membrane sleeve, and then a combustion reaction occurs rapidly with the aid of liquid oxygen.

[0017] Preferably, the positioning part includes two positioning blocks, the upper inner side of the mounting tube is provided with two mounting grooves, the outer side of the mounting tube is provided with two threaded holes, the threaded holes are connected to the mounting grooves, the inner side of the mounting groove is provided with two positioning grooves, the inner side of the positioning groove is provided with a guide block, the guide block is fixedly connected to the positioning block, and the inner side of the threaded hole is provided with a set screw through thread engagement.

[0018] By adopting the above structure, the high-temperature resistant flame-retardant wire can be clamped and positioned, and the height of the resistance wire ignition head can be adjusted.

[0019] The novel liquid oxygen rock expansion and fracturing device proposed in this utility model has the following advantages:

[0020] 1. By setting up oxygen tank one, flexible membrane sleeve, liquid oxygen tank two, electromagnetic three-way valve, and connection unit, after a certain amount of liquid oxygen is delivered into the flexible membrane sleeve, the liquid oxygen is converted into oxygen under the action of gas delivery pump, vaporizer, and electromagnetic three-way valve. Then, the oxygen slowly pushes the residual liquid oxygen in the pipeline to flow directionally into the flexible membrane sleeve, which improves the liquid oxygen delivery efficiency, the stability and cleanliness of the delivery process, and at the same time, it empties the liquid oxygen in the pipeline, reduces the damage to the pipeline, and extends the service life of the pipeline.

[0021] 2. By setting up an ignition unit, the positioning part can accurately position and adjust the height of the resistance wire ignition head, so that the burning material burns evenly from the center to the outside, ensuring uniform heat transfer. The generated gas can better expand the flexible membrane sleeve, thereby causing the rock to fracture. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the front side of a novel liquid oxygen rock expansion and fracturing device proposed in this utility model.

[0023] Figure 2 The present utility model proposes Figure 1 A magnified three-dimensional structural diagram of a portion of area A in the middle;

[0024] Figure 3 The present utility model proposes Figure 2 A magnified three-dimensional structural diagram of a portion of area B in the middle section;

[0025] Figure 4 The present utility model proposes Figure 1 A magnified three-dimensional structural diagram of a portion of the central C area;

[0026] Figure 5 The present utility model proposes Figure 1 A magnified three-dimensional structural diagram of a portion of the central D region;

[0027] Figure 6 This is a three-dimensional cross-sectional view of the upper side of a novel liquid oxygen rock expansion and fracturing device proposed in this utility model.

[0028] Figure 7 The present utility model proposes Figure 6 A magnified three-dimensional structural diagram of a portion of the central E region;

[0029] Figure 8 This is a three-dimensional cross-sectional view of the left side of a novel liquid oxygen rock expansion and fracturing device proposed in this utility model.

[0030] Figure 9 The present utility model proposes Figure 8 A magnified three-dimensional structural diagram of a portion of the central F region.

[0031] In the diagram: 1. Liquid oxygen tank one; 2. Flexible membrane sleeve; 3. Connecting plate; 4. Connecting ring; 5. Liquid oxygen tank two; 6. Solenoid three-way valve; 7. Feed pipe; 8. Connecting unit; 81. Cryogenic liquid transfer pump; 82. Gas transfer pump; 83. Vaporizer; 84. Connecting pipe; 85. A-way pipe; 86. B-way pipe; 87. B-solenoid valve; 88. Main pipe; 9. Ignition unit; 91. Resistance wire igniter head; 92. Mounting pipe; 93. High temperature resistant flame retardant wire; 94. Positioning part; 941. Positioning block; 942. Guide block; 943. Top screw; 10. Exhaust pipe; 11. A-solenoid valve; 12. Auxiliary pipe. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0033] Reference Figure 1-9 A novel liquid oxygen rock expansion fracturing device includes a controller, a liquid oxygen tank 1 and a flexible membrane sleeve 2, and also includes a connecting plate 3, a liquid oxygen tank 2 5 and an ignition unit 9.

[0034] The flexible membrane sleeve 2 has a through hole on its upper side, and a connecting ring 4 is fixedly connected to the inner wall of the through hole. Combustible material is filled into the flexible membrane sleeve 2 through the connecting ring 4. The connecting ring 4 is located on the lower side of the connecting plate 3, and the connecting ring 4 and the connecting plate 3 are detachably sealed by bolts evenly distributed around the circumference. A sealing structure is installed between the connecting ring 4 and the connecting plate 3 to ensure the airtightness or liquid tightness of the joint surface between the two.

[0035] The ignition unit 9 is located between the inner side of the flexible membrane sleeve 2 and the connecting plate 3. The ignition unit 9 is used to ignite the combustible material inside the flexible membrane sleeve 2.

[0036] The ignition unit 9 includes a resistance wire igniter head 91, which is made of tungsten wire and heats up rapidly after being energized, precisely igniting the combustible material inside the flexible membrane sleeve 2. The upper side of the connecting plate 3 is provided with a C-mounting hole, and an installation tube 92 is detachably installed inside the C-mounting hole by means of threads. A high-temperature resistant flame-retardant wire 93 is passed through the inner side of the installation tube 92. One end of the high-temperature resistant flame-retardant wire 93 is connected to the resistance wire igniter head 91, and the other end of the high-temperature resistant flame-retardant wire 93 is connected to the power supply and controller. The high-temperature resistant flame-retardant wire 93 and the inner side of the installation tube 92 are provided with a positioning part 94 for axially limiting and fixing the high-temperature resistant flame-retardant wire 93. The installation tube 92 is located at the center of the connecting plate 3, so that the resistance wire igniter head 91 is on the central axis of the flexible membrane sleeve 2, so that the resistance wire igniter head 91 can ignite the center end of the combustible material inside the flexible membrane sleeve 2, allowing the combustible material to burn evenly from the center to the outside, ensuring uniform heat transfer. The generated gas can better expand the flexible membrane sleeve 2, thereby causing the rock to fracture.

[0037] The positioning part 94 includes two positioning blocks 941. The upper inner side of the mounting tube 92 is provided with two mounting grooves, and the outer side of the mounting tube 92 is provided with two threaded holes that communicate with the mounting grooves. The inner side of the mounting groove is provided with two positioning grooves, and the inner side of the positioning groove is provided with guide blocks 942. The guide blocks 942 and the positioning blocks 941 are fixedly connected to form an integral positioning structure. The inner side of the threaded hole is provided with a set screw 943 through thread engagement. By rotating the set screw 943, the positioning blocks 941 can be pushed to move along the mounting groove, thereby adjusting the axial position of the positioning blocks 941. The two positioning blocks 941 are located outside the high-temperature resistant flame-retardant wire 93. By using the set screw 943, the two positioning blocks 941 clamp the high-temperature resistant flame-retardant wire 93, thereby positioning the resistance wire ignition head 91. At the same time, by rotating the set screw 943, the position of the positioning blocks 941 can be adjusted, and the height of the resistance wire ignition head 91 can be adjusted by using the high-temperature resistant flame-retardant wire 93, so that the resistance wire ignition head 91 is in a suitable position, thereby improving the ignition efficiency.

[0038] The liquid oxygen tank 2 5 is equipped with an electromagnetic three-way valve 6 on one side. The upper side of the connecting plate 3 is equipped with mounting holes A and B. An exhaust pipe 10 is installed inside the mounting hole B. An auxiliary pipe 12 is installed at the upper interface of the electromagnetic valve 11. The auxiliary pipe 12 can be selected in different lengths according to the requirements, so that the upper end of the auxiliary pipe 12 protrudes through the drilled hole, which is conducive to the discharge of oxygen in the flexible membrane sleeve 2. The upper end of the exhaust pipe 10 is equipped with the electromagnetic valve 11, and the electromagnetic valve 11 and the electromagnetic three-way valve 6 are connected to the power supply and the controller through wires to realize linkage control.

[0039] A feed pipe 7 is installed inside the mounting hole. A connection unit 8 is provided between the electromagnetic three-way valve 6, the feed pipe 7, the liquid oxygen tank 1, and the liquid oxygen tank 2. The connection unit 8 is used to directionally transport liquid oxygen into the flexible membrane sleeve 2.

[0040] Connection unit 8 includes a cryogenic liquid transfer pump 81 and a gas transfer pump 82. A vaporizer 83 is installed between the liquid oxygen tank 2 5 and the gas transfer pump 82. Connecting pipes 84 are installed between the liquid inlet of the vaporizer 83 and the interface of the liquid oxygen tank 2 5, between the gas outlet of the vaporizer 83 and the gas inlet of the gas transfer pump 82, and between the liquid inlet of the cryogenic liquid transfer pump 81 and the interface of the liquid oxygen tank 1 5. The vaporizer 83 is used to convert the cryogenic liquid oxygen output from the liquid oxygen tank 2 5 into gaseous oxygen. An A-connection pipe 85 is installed between the gas outlet of the gas transfer pump 82 and the interface of the solenoid three-way valve 6. A B-connection pipe 86 is installed between the liquid outlet of the cryogenic liquid transfer pump 81 and the interface of the solenoid three-way valve 6. A B-solenoid valve 87 is installed at the upper end of the feed pipe 7. A main pipe 88 is installed between the interface of the B-solenoid valve 87 and the interface of the solenoid three-way valve 6. The cryogenic liquid transfer pump 81, the gas transfer pump 82, the vaporizer 83, and the B-solenoid valve 84 are connected. All solenoid valves 87 are connected to the controller and power supply via wires, forming an integrated delivery network controlled by the central control system. This enables the directional and quantitative delivery of liquid oxygen to the electromagnetic three-way valve 6, and finally into the flexible membrane sleeve 2. Liquid oxygen in liquid oxygen tank 1 is delivered to the flexible membrane sleeve 2. Liquid oxygen will still remain in the main pipe 88. At this time, under the action of the gas delivery pump 82, vaporizer 83 and electromagnetic three-way valve 6, the liquid oxygen in liquid oxygen tank 2 5 is replaced with oxygen. Then, the oxygen slowly pushes the residual liquid oxygen in the pipeline to flow directionally into the flexible membrane sleeve 2, providing stability and overall cleanliness. A valve can be installed at the main pipe 88 to finally discharge the oxygen in the main pipe 88, which is convenient for subsequent liquid oxygen delivery. A detector is installed at the corresponding position on the B-way pipe 86 between the outlet of the cryogenic liquid delivery pump 81 and the electromagnetic three-way valve 6 to detect the flow rate of liquid oxygen.

[0041] Operating principle:

[0042] Liquid oxygen in liquid oxygen tank 1 flows through connecting pipe 84 to cryogenic liquid transfer pump 81. Then, cryogenic liquid transfer pump 81 transports the liquid oxygen through B-connection pipe 86, solenoid three-way valve 6, B-solenoid valve 87, and main pipe 88 to flexible membrane sleeve 2. After quantitative delivery, the control path of solenoid three-way valve 6 changes, preventing liquid oxygen in liquid oxygen tank 1 from flowing to main pipe 88. At this time, liquid oxygen in liquid oxygen tank 2 (5) flows through connecting pipe 84 to vaporizer 83, converting liquid oxygen into oxygen. Then, the oxygen flows through connecting pipe 84 to gas transfer pump 82, and then... The delivery pump 82 delivers gas to the A-pipe 85 and enters the main pipe 88 through the solenoid three-way valve 6. The oxygen pushes the residual liquid oxygen in the main pipe 88 through the B solenoid valve 87 into the flexible membrane sleeve 2. When all the residual liquid oxygen in the main pipe 88 has flowed into the flexible membrane sleeve 2, the B solenoid valve 87 automatically closes and the A solenoid valve 11 automatically opens to discharge the oxygen that has entered the flexible membrane sleeve 2. After the discharge is complete, the A solenoid valve 11 automatically closes, allowing the flexible membrane sleeve 2 to form a sealed space. The ignition unit 9 ignites the combustible material in the flexible membrane sleeve 2, and the combustion reaction takes place with the help of liquid oxygen.

[0043] In the description of this patent, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; furthermore, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through an intermediate medium; they can be internal connections between two components. For those skilled in the art, the specific meaning of the above terms in this patent can be understood according to the specific circumstances.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A new type of liquid oxygen rock expansion and cracking device, comprising a controller, a liquid oxygen tank (1) and a flexible film sleeve (2), characterized in that, Also includes: The connecting plate (3) has a through hole on the upper side of the flexible membrane sleeve (2), and a connecting ring (4) is fixedly connected to the inner wall of the through hole. The connecting ring (4) is located on the lower side of the connecting plate (3), and the connecting ring (4) and the connecting plate (3) are detachably sealed by bolts evenly distributed in the circumference. Liquid oxygen tank 2 (5), a solenoid three-way valve (6) is provided on one side of the liquid oxygen tank 2 (5), an A mounting hole and a B mounting hole are provided on the upper side of the connecting plate (3), a feed pipe (7) is installed inside the A mounting hole, an exhaust pipe (10) is installed inside the B mounting hole, an A solenoid valve (11) is installed at the upper end of the exhaust pipe (10), and the A solenoid valve (11) and the solenoid three-way valve (6) are connected to the power supply and controller through wires. A connecting unit (8) is provided between the solenoid three-way valve (6), the feed pipe (7), the liquid oxygen tank 1 (1) and the liquid oxygen tank 2 (5), and the connecting unit (8) is used to directionally transport liquid oxygen into the flexible membrane sleeve (2); Ignition unit (9) is located between the flexible membrane sleeve (2) and the connecting plate (3). The ignition unit (9) is used to ignite the combustible material inside the flexible membrane sleeve (2).

2. The liquid oxygen rock new type dilatant cracking device according to claim 1, characterized in that, The connecting unit (8) includes a cryogenic liquid transfer pump (81) and a gas transfer pump (82). A vaporizer (83) is provided between the second liquid oxygen tank (5) and the gas transfer pump (82). Connecting pipes (84) are installed between the liquid inlet of the vaporizer (83) and the interface of the second liquid oxygen tank (5), between the gas outlet of the vaporizer (83) and the gas inlet of the gas transfer pump (82), and between the liquid inlet of the cryogenic liquid transfer pump (81) and the interface of the first liquid oxygen tank (1). The gas outlet of the gas transfer pump (82) and the electromagnetic three An A-pipe (85) is installed between the ports of the valve (6), a B-pipe (86) is installed between the outlet of the cryogenic liquid transfer pump (81) and the port of the electromagnetic three-way valve (6), a B-solenoid valve (87) is installed at the upper end of the feed pipe (7), a main pipe (88) is installed between the port of the B-solenoid valve (87) and the port of the electromagnetic three-way valve (6), and the cryogenic liquid transfer pump (81), gas transfer pump (82), vaporizer (83) and B-solenoid valve (87) are all connected to the controller and power supply through wires.

3. The novel liquid oxygen rock expansion and fracturing device according to claim 1, characterized in that, An auxiliary pipe (12) is installed at the upper interface of the solenoid valve A (11).

4. The novel liquid oxygen rock expansion and fracturing device according to claim 1, characterized in that, The ignition unit (9) includes a resistance wire ignition head (91). The upper side of the connecting plate (3) is provided with a C-mounting hole. An installation tube (92) is detachably installed inside the C-mounting hole by means of a thread. A high-temperature resistant flame-retardant wire (93) is provided through the inner side of the installation tube (92). One end of the high-temperature resistant flame-retardant wire (93) is connected to the resistance wire ignition head (91), and the other end of the high-temperature resistant flame-retardant wire (93) is connected to the power supply and the controller. A positioning part (94) is provided inside the high-temperature resistant flame-retardant wire (93) and the installation tube (92).

5. The novel liquid oxygen rock expansion and fracturing device according to claim 4, characterized in that, The positioning part (94) includes two positioning blocks (941). The upper inner side of the mounting tube (92) is provided with two mounting grooves. The outer side of the mounting tube (92) is provided with two threaded holes. The threaded holes communicate with the mounting grooves. The inner side of the mounting groove is provided with two positioning grooves. The inner side of the positioning groove is provided with a guide block (942). The guide block (942) is fixedly connected to the positioning block (941). The inner side of the threaded hole is provided with a set screw (943) through thread engagement.

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