A connecting device for fast hoisting instruments and installation method

Abstract

This invention relates to the field of instrument hoisting technology, and discloses a connection device and installation method for quickly hoisting instruments. The device includes a turntable, a guide block, a turntable cover, and an upper cover. The guide block is movably disposed inside the turntable, and the turntable cover is movably disposed on the upper side of the turntable, with the interior of the turntable cover movably connected to the guide block. The outer periphery of the turntable cover is fixedly connected to the inner wall of the upper cover. The upper surface of the turntable fits against the lower end face of the upper cover, resulting in minimal wear during multiple disassemblies. The guide block extends and connects with a groove inside the upper cover. Simultaneously, the steel balls on the corrugated screws inside the guide block lock with the U-shaped groove inside the upper cover, preventing the safety hazard of instruments loosening and falling after installation. The cooperation between the turntable interior and the guide block makes hoisting instruments more convenient and faster, overcoming the inefficiency problem of traditional threaded connections.

Description

Technical Field

[0001] This invention relates to the field of instrument hoisting technology, and in particular to a connection device and installation method for quickly hoisting instruments. Background Technology

[0002] When installing some instruments and meters, some need to be installed at high locations, which requires hoisting brackets. Hoisting brackets or rods are used to fix the instruments and meters to the brackets or rods, and then hoisting equipment is used to lift them to the designated position. Then, the hoisting brackets or rods are assembled with their matching fixing bases to complete the fixation of the instruments and meters. For example, instruments such as beauty instrument lamp heads, monitors, and projectors sometimes need to be suspended by connecting devices, especially in some fields, such as light-sensing beauty medical instruments, where lamp heads need to be changed frequently and quickly to treat different patients. Therefore, the installation of lamp heads requires the use of connecting devices for suspended installation.

[0003] Application number 202222235131.0 discloses a manual monitor hoisting device, comprising a housing, a display screen fixedly connected to the left end of the housing, several heat dissipation slots on the front and rear right ends of the housing, a fixing block fixedly connected to the middle right end of the housing, a slot on the upper end of the fixing block, a fixing device engaged in the slot, two No. 2 fixing bolts threadedly connected to the front left and rear left ends of the fixing device, four No. 2 fixing bolts in total, a No. 1 fixing bolt threadedly connected to the right end of the fixing device, a connecting device threadedly connected to the fixing device, and No. 3 fixing bolts threadedly connected to the four corners of the lower end of the connecting device. By setting the fixing device and the connecting device and using the threaded connection method, disassembly and installation are convenient, and the height of the monitor can be manually adjusted, making the operation convenient.

[0004] The above-mentioned threaded connection is time-consuming and labor-intensive to install in practical applications, and is also troublesome to maintain and disassemble. It is not conducive to quick installation or disassembly, which affects the efficiency of installation or disassembly. During the installation process, at least two people are required to complete the installation and the threads need to be tightened repeatedly to achieve locking. Moreover, the bolted connection method causes wear on the internal threads of the connecting device when disassembled many times, making the instrument installation unstable, reducing the tensile strength and posing a safety hazard of falling.

[0005] Therefore, it is necessary to solve the above problems by providing a connection device and installation method for quickly hoisting instruments and meters. Summary of the Invention

[0006] The purpose of this invention is to provide a connection device and installation method for quickly hoisting instruments and meters, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a connection device for rapid hoisting of instruments and meters, comprising a turntable, a guide block, a turntable cover, and an upper end cover. The guide block is movably disposed inside the turntable, the turntable cover is movably disposed on the upper side of the turntable, and the interior of the turntable cover is movably connected to the guide block. The outer periphery of the turntable cover is fixedly connected to the inner wall of the upper end cover, and the upper surface of the turntable is in contact with the lower end face of the upper end cover.

[0008] The turntable includes a first connecting post, one end of which is fixedly connected to a knurled sawtooth gear. A boss is fixedly provided at the end of the knurled sawtooth gear away from the first connecting post. A central post is fixedly provided at the end of the boss away from the knurled sawtooth gear. A guide groove is provided on the boss. There are multiple guide grooves, and the multiple guide grooves are evenly distributed around the central post on the boss. The number of guide grooves and guide blocks corresponds one-to-one, and the guide grooves and guide blocks are slidably connected.

[0009] When installing instruments, the guide groove inside the boss is designed according to the Archimedes curve, i.e., the constant velocity spiral. During manual operation of the turntable, the speed at which the guide block rotates along the guide groove is proportional to the speed of its radial linear movement within the turntable cover. This allows installers to perceive the movement of the guide block during manual operation, avoiding sudden acceleration or deceleration that could cause the guide block to impact the upper cover and affect its service life. At the same time, the locking connection between the guide block and the upper cover enables quick installation of instruments and overcomes the instability caused by wear during repeated disassembly and assembly of threaded connections, ensuring the safe and reliable installation of instruments.

[0010] Preferably, the guide block includes a square body, and a cylindrical guide rod is fixedly provided on the lower surface of the square body. The cylindrical guide rod is slidably connected to the guide groove on the turntable. A second threaded hole is provided on the lower surface of the square body away from the cylindrical guide rod, and a wave screw is threaded into the interior of the second threaded hole.

[0011] Preferably, the turntable cover includes a mounting cover, which is movably disposed on the outside of the boss. The upper end face of the mounting cover has a recessed groove, and the inner end face of the mounting cover has a clearance groove. The interior of the clearance groove is slidably connected to the cylindrical guide rod on the guide block. The upper end face of the mounting cover has a square guide hole corresponding to the lower side of the recessed groove.

[0012] Preferably, there are multiple clearance grooves and square guide holes, and the number of clearance grooves and square guide holes corresponds one-to-one with the number of guide blocks. The multiple clearance grooves and square guide holes are evenly distributed inside the mounting cover, and each square guide hole has a notch at the end away from the center.

[0013] Preferably, a damper is movably installed inside the settling tank, and the damper surrounds the outside of the central column. A cover plate is provided on the upper surface of the damper. Both the cover plate and the central column have first threaded holes. Countersunk screws are threaded into the first threaded holes. The cover plate and the central column are fixedly connected by countersunk screws.

[0014] Preferably, the upper cover includes a second connecting post, and an upper cover body is fixedly disposed on the lower end face of the second connecting post. The upper cover body is fixedly connected to the turntable cover and surrounds the outside of the turntable cover. A groove is formed inside the upper cover body, and a U-shaped groove is formed inside the groove on the side away from the second connecting post.

[0015] Preferably, the wave screw includes a threaded housing, which is threadedly connected to a second threaded hole on the guide block. A spring is fixedly disposed inside the threaded housing, and a steel ball is movably disposed inside the threaded housing on the side away from the fixed end of the spring.

[0016] An installation method for a connection device for rapid hoisting of instruments and meters includes the following installation steps: S1. When installing instruments and meters, fix them on the turntable using an external device; S2. Connect the assembled turntable with the upper cover, and the controller controls the upper cover to be powered on to lock the turntable cover. S3. Rotate the turntable counterclockwise. The guide groove inside the turntable will push the guide block radially open, so that the guide block extends out from the turntable cover and inserts into the upper cover. S4. When the guide block is inserted into the upper cover, the steel ball of the wave screw inside the guide block pops out from the inside and engages with the U-shaped groove in the upper cover to lock it in place, thus completing the fixation between the turntable and the upper cover and ensuring the installation of the instrument.

[0017] The technical effects and advantages of this invention are as follows: 1. This invention designs the guide groove inside the turntable according to the Archimedes spiral curve, i.e., the constant velocity spiral curve. When the guide block moves along the guide groove, due to the constant velocity ratio of the circular motion and radial motion of the curve, the speed of the guide block rotating along the guide groove is proportional to the speed of its linear motion along the radial direction inside the turntable cover. This makes it easier for installers to perceive the movement state of the guide block during manual operation, and prevents sudden speed changes.

[0018] 2. This invention increases the damping of the turntable by setting a damper inside the connecting device, thereby adjusting the feel of the operator's hand when operating the device and reducing accidental contact. It also adds an auxiliary self-locking function, that is, the connecting device will not automatically pop open due to external vibration when no force is applied to the turntable, thus enhancing the overall stability of the connecting device.

[0019] 3. This invention uses a wave screw and a guide block that extends from the turntable cover and inserts into a groove inside the upper cover body for connection. When the square body on the guide block enters the groove, the inner wall of the lower side of the groove compresses the steel ball inside the wave screw, causing the steel ball to retract into the threaded outer shell. When the wave screw moves with the square body to the U-shaped groove inside the upper cover body, the steel ball is ejected from the threaded outer shell under the action of the spring and locked into the U-shaped groove, thus preventing the instrument from becoming loose after hoisting. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 This is a schematic diagram of the turntable structure of the present invention.

[0022] Figure 3 This is a schematic diagram of the guide block structure of the present invention.

[0023] Figure 4 This is a schematic diagram of the turntable cover structure of the present invention.

[0024] Figure 5 This is a schematic diagram of the turntable cover of the present invention from another perspective.

[0025] Figure 6 This is a schematic diagram of the upper end cap structure of the present invention.

[0026] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at point A in the middle.

[0027] Figure 8 This is a schematic diagram of the wave screw structure of the present invention.

[0028] Figure 9 This is a schematic diagram of the retracted state structure of the guide block of the present invention.

[0029] Figure 10 This is a schematic diagram of the extended state of the guide block in this invention.

[0030] In the diagram: 1. Turntable; 101. First connecting post; 102. Knurled sawtooth gear; 103. Boss; 104. Guide groove; 105. Center post; 106. First threaded hole; 2. Guide block; 201. Square body; 202. Cylindrical guide rod; 203. Second threaded hole; 3. Turntable cover; 301. Mounting cover; 302. Clearance groove; 303. Square guide hole; 304. Countersunk groove; 4. Cover plate; 5. Damper; 6. Upper end cover; 601. Second connecting post; 602. Upper cover body; 603. Groove; 604. U-shaped groove; 7. Countersunk screw; 8. Wave screw; 801. Threaded outer shell; 802. Steel ball; 803. Spring. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0032] First Embodiment This invention provides, for example Figures 1 to 10 The device shown is a connection device for quickly hoisting instruments and meters, including a turntable 1, a guide block 2, a turntable cover 3, and an upper end cover 6. The guide block 2 is movably disposed inside the turntable 1, the turntable cover 3 is movably disposed on the upper side of the turntable 1, and the interior of the turntable cover 3 is movably connected to the guide block 2. The outer periphery of the turntable cover 3 is fixedly connected to the inner wall of the upper end cover 6, and the upper surface of the turntable 1 is in contact with the lower end surface of the upper end cover 6.

[0033] like Figure 1 , Figure 2 As shown, the turntable 1 includes a first connecting post 101. A knurled sawtooth gear 102 is fixedly connected to one end of the first connecting post 101. A boss 103 is fixedly provided at the end of the knurled sawtooth gear 102 away from the first connecting post 101. A central post 105 is fixedly provided at the end of the boss 103 away from the knurled sawtooth gear 102. A guide groove 104 is provided on the boss 103. There are multiple guide grooves 104, and the multiple guide grooves 104 are evenly distributed around the central post 105 on the boss 103. The number of guide grooves 104 and guide blocks 2 are one-to-one, and the guide grooves 104 and guide blocks 2 are slidably connected.

[0034] It is worth noting that the guide groove 104 on the boss 103 is designed according to the Archimedean spiral curve, that is, the constant velocity spiral curve. The Archimedean spiral curve is the trajectory generated by a point moving away from a fixed point at a constant speed while rotating around the fixed point at a constant angular velocity. When the guide block 2 moves along the guide groove 104, due to the constant velocity ratio of the circular motion and radial motion of the curve, the speed of the guide block 2 rotating along the guide groove 104 is proportional to the speed of its linear motion along the radial direction inside the turntable cover 3. This makes it easier for installers to perceive the motion state of the guide block 2 when performing manual operation, and there will be no sudden speed increase or decrease.

[0035] like Figure 3As shown, the guide block 2 includes a square body 201. A cylindrical guide rod 202 is fixedly installed on the lower surface of the square body 201. The cylindrical guide rod 202 is slidably connected to the guide groove 104 on the turntable 1. A second threaded hole 203 is opened on the lower surface of the square body 201 away from the cylindrical guide rod 202. The interior of the second threaded hole 203 is threaded with a wave screw 8.

[0036] It is worth noting that during the assembly of the connecting device, the wave screw 8 is pre-installed into the second threaded hole 203.

[0037] like Figure 4 , Figure 5 As shown, the turntable cover 3 includes a mounting cover 301, which is movably disposed on the outside of the boss 103. The upper end face of the mounting cover 301 is provided with a recessed groove 304, and the inner end face of the mounting cover 301 is provided with a clearance groove 302. The interior of the clearance groove 302 is slidably connected to the cylindrical guide rod 202 on the guide block 2. The upper end face of the mounting cover 301 is provided with a square guide hole 303 on the lower side corresponding to the recessed groove 304. There are multiple clearance grooves 302 and square guide holes 303, and the number of clearance grooves 302 and square guide holes 303 corresponds one-to-one with the number of guide blocks 2. Multiple clearance grooves 302 and square guide holes 303 are evenly distributed inside the mounting cover 301. The end of the square guide hole 303 away from the center is provided with a notch.

[0038] It is worth noting that during the installation of the connecting device, the directional body 201 is inserted into one end of the wave screw 8 and rotated into the square guide hole 303. After the square body 201 is inserted into each square guide hole 303, the cylindrical guide rod 202 on the guide block 2 is embedded into the guide groove 104 of the turntable 1 to complete the movement limitation of the guide block 2.

[0039] The size of the clearance groove 302 in the mounting cover 301 matches the size of the cylindrical guide rod 202 on the guide block 2, the size of the square guide hole 303 matches the size of the square body 201 on the guide block 2, and each square guide hole 303 has a notch on the side away from the recess 304, which is used to avoid the wave screw 8.

[0040] A damper 5 is movably installed inside the settling tank 304, and the damper 5 surrounds the outside of the central column 105. A cover plate 4 is provided on the upper surface of the damper 5. Both the cover plate 4 and the central column 105 are provided with first threaded holes 106. The first threaded holes 106 are threaded with countersunk screws 7. The cover plate 4 and the central column 105 are fixedly connected by the countersunk screws 7.

[0041] It is worth noting that the damper 5 needs to be customized according to the size of the connecting device. The damper 5 increases the damping of the turntable 1, adjusts the feel of the operator when operating the device, reduces accidental contact when operating the connecting device, and simultaneously adds an auxiliary self-locking function. That is, when no force is applied to the turntable 1, the connecting device will not automatically pop open due to external vibration, thus enhancing the overall stability of the connecting device.

[0042] like Figure 6 , Figure 7 As shown, the upper cover 6 includes a second connecting post 601. An upper cover body 602 is fixedly disposed on the lower end face of the second connecting post 601. The upper cover body 602 is fixedly connected to the turntable cover 3 and surrounds the outside of the turntable cover 3. A groove 603 is provided inside the upper cover body 602. A U-shaped groove 604 is provided inside the side of the groove 603 away from the second connecting post 601.

[0043] like Figure 8 As shown, the wave screw 8 includes a threaded housing 801, which is threadedly connected to the second threaded hole 203 on the guide block 2. A spring 803 is fixedly installed inside the threaded housing 801, and a steel ball 802 is movably installed on the side of the threaded housing 801 away from the fixed end of the spring 803.

[0044] It is worth noting that during the hoisting and installation of the instruments, the guide block 2 extends from the turntable cover 3 and inserts into the groove 603 inside the upper cover 602 for connection. When the square body 201 on the guide block 2 enters the groove 603, the lower inner wall of the groove 603 compresses the steel ball 802 inside the wave screw 8, causing the steel ball 802 to retract into the threaded outer shell 801. When the wave screw 8 moves with the square body 201 to the U-shaped groove 604 inside the upper cover 602, the steel ball 802 is ejected from the threaded outer shell 801 under the action of the spring 803 and locks into the U-shaped groove 604, thus preventing the instruments from becoming loose after hoisting and completing the hoisting of the instruments.

[0045] Working principle: When hoisting and installing instruments, insert the wave screw 8 into the second threaded hole 203 on each guide block 2. Then, rotate one end of the square body on the guide block 2 into the square guide hole 303. After the square body 201 is inserted into each square guide hole 303, insert the cylindrical guide rod 202 on the guide block 2 into the guide groove 104 of the turntable 1. Then, insert the damper 5 into the recess 304 of the turntable cover 3. Then, insert the cover plate 4 into the recess 304 to limit the damper 5. The central column 105 in the turntable 1 is fixed to the cover plate 4 by countersunk screws 7, completing the assembly of the connecting device. Insert the assembled connecting device into the upper end cover 6. When the lower surface of the upper end cover 6 is in contact with the upper surface of the knurled sawtooth gear 102, the controller controls the upper cover to move. When the electromagnetic locking ring inside body 602 is energized, the turntable cover 3 is locked. At this time, the installer holds the knurled sawtooth gear 102 and rotates the turntable 1 counterclockwise. The guide groove 104 inside the turntable 1 pushes the cylindrical guide rod 202 outward along the guide groove 104, so that the cylindrical guide rod 202 pushes the square body 201 to move radially in the square guide hole 303. The cylindrical guide rod 202 pushes the square body 201 out of the square guide hole 303, so that the square body 201 is inserted into the groove 603 of the upper cover body 602 for locking. When the wave screw 8 moves with the square body 201 to the U-shaped groove 604 inside the upper cover body 602, the steel ball 802 pops out from the threaded outer shell 801 under the action of the spring 803 and locks with the U-shaped groove 604, completing the hoisting of the instrument.

[0046] When it is necessary to disassemble the instrument, the installer only needs to rotate the knurled sawtooth gear 102 clockwise. The guide groove 104 inside the turntable 1 will retract the cylindrical guide rod 202 inward. At this time, the cylindrical guide rod 202 will drive the square body 201 to retract radially within the square guide hole 303. During the process of the square body 201 retracting and coming out of the groove 603, the edge of the U-shaped groove 604 will squeeze the steel ball 802 of the wave screw 8 due to the pulling force. The spring 803 will be compressed and the steel ball 802 will retract into the threaded outer shell 801, so that the steel ball 802 will come out of the U-shaped groove 604. The square body 201 will unlock and come out of the groove 603 and be put into the turntable cover 3. Then the controller will de-energize the electromagnetic locking ring inside the upper cover 602 to remove the turntable cover 3 from the upper cover 602, thus completing the disassembly of the instrument.

[0047] After the above operations are performed, the instrument hoisting is more convenient and faster, overcoming the problem of low efficiency in traditional threaded connections. At the same time, the wear is less when disassembling multiple times. The guide block 2 extends and connects with the groove 603 inside the upper cover 602. Meanwhile, the steel ball 802 on the wave screw 8 inside the guide block 2 locks with the U-shaped groove 604 inside the upper cover 602, avoiding the problem of loosening of the instrument after installation. This makes the hoisting of the instrument more stable and avoids excessive disassembly that could cause thread wear. In the subsequent connection process, this could lead to loosening at the connection point, resulting in a decrease in the tensile strength of the connection device and the risk of the instrument falling, posing a safety hazard.

[0048] Second Embodiment An installation method for a connection device for rapid hoisting of instruments and meters includes the following installation steps: S1. When installing instruments and meters, fix the instruments and meters on turntable 1 using an external device; S2. The assembled turntable 1 is fitted with the upper cover 6, and the controller controls the upper cover 6 to be powered on to lock the turntable cover 3. S3. Rotate the turntable 1 counterclockwise. The guide groove 104 inside the turntable 1 will push the guide block 2 radially open, so that the guide block 2 extends out from the turntable cover 3 and inserts into the upper cover 6. S4. When the guide block 2 is inserted into the upper cover 6, the steel ball 802 of the wave screw 8 inside the guide block 2 pops out from the inside and engages with the U-shaped groove 604 inside the upper cover 6 to lock it, thus completing the fixation between the turntable 1 and the upper cover 6 and the installation of the instrument.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A connection device for rapid hoisting of instruments and meters, characterized in that: It includes a turntable (1), a guide block (2), a turntable cover (3) and an upper cover (6). The guide block (2) is movably disposed inside the turntable (1). The turntable cover (3) is movably disposed on the upper side of the turntable (1), and the interior of the turntable cover (3) is movably connected to the guide block (2). The outer periphery of the turntable cover (3) is fixedly connected to the inner wall of the upper cover (6). The upper surface of the turntable (1) is in contact with the lower end face of the upper cover (6). The turntable (1) includes a first connecting post (101), one end of which is fixedly connected to a knurled sawtooth gear (102). A boss (103) is fixedly provided at the end of the knurled sawtooth gear (102) away from the first connecting post (101). A central post (105) is fixedly provided at the end of the boss (103) away from the knurled sawtooth gear (102). A guide groove (104) is provided on the boss (103). There are multiple guide grooves (104), and multiple guide grooves (104) are evenly distributed on the boss (103) around the central post (105). The number of guide grooves (104) and guide blocks (2) are one-to-one, and the guide grooves (104) and guide blocks (2) are slidably connected. The guide block (2) includes a square body (201), and a cylindrical guide rod (202) is fixedly provided on the lower surface of the square body (201). The cylindrical guide rod (202) is slidably connected to the guide groove (104) on the turntable (1). A second threaded hole (203) is provided on the lower surface of the square body (201) away from the cylindrical guide rod (202). The interior of the second threaded hole (203) is threaded with a wave screw (8). The turntable cover (3) includes a mounting cover (301), which is movably disposed on the outside of the boss (103). The upper end face of the mounting cover (301) is provided with a recess (304), and the inner end face of the mounting cover (301) is provided with a clearance groove (302). The interior of the clearance groove (302) is slidably connected to the cylindrical guide rod (202) on the guide block (2). The upper end face of the mounting cover (301) is provided with a square guide hole (303) on the lower side of the recess (304). The upper cover (6) includes a second connecting post (601), and an upper cover body (602) is fixedly provided on the lower end face of the second connecting post (601). The upper cover body (602) is fixedly connected to the turntable cover (3), and the upper cover body (602) surrounds the outside of the turntable cover (3). A groove (603) is provided inside the upper cover body (602), and a U-shaped groove (604) is provided inside the side of the groove (603) away from the second connecting post (601). The wave screw (8) includes a threaded housing (801), which is threadedly connected to the second threaded hole (203) on the guide block (2). A spring (803) is fixedly installed inside the threaded housing (801), and a steel ball (802) is movably installed on the side of the threaded housing (801) away from the fixed end of the spring (803).

2. The connection device for rapid hoisting of instruments and meters according to claim 1, characterized in that: There are multiple clearance grooves (302) and square guide holes (303), and the clearance grooves (302) and square guide holes (303) are in a one-to-one correspondence with the number of guide blocks (2). Multiple clearance grooves (302) and square guide holes (303) are evenly distributed inside the mounting cover (301), and each square guide hole (303) has a notch at the end away from the center.

3. The connection device for rapid hoisting of instruments and meters according to claim 2, characterized in that: The damper (5) is movably installed inside the sink (304), and the damper (5) surrounds the outside of the central column (105). The upper surface of the damper (5) is provided with a cover plate (4). The cover plate (4) and the central column (105) are both provided with a first threaded hole (106). The first threaded hole (106) is internally threaded with a countersunk screw (7). The cover plate (4) and the central column (105) are fixedly connected by the countersunk screw (7).

4. A method for installing a connection device for rapid hoisting of instruments and meters, wherein the method utilizes the connection device for rapid hoisting of instruments and meters as described in claim 1 to install the instruments and meters, characterized in that: Includes the following steps: S1. When installing instruments, fix them on the turntable (1) using an external device; S2. The assembled turntable (1) is fitted with the upper cover (6), and the controller controls the upper cover (6) to be energized to lock the turntable cover (3). S3. Rotate the turntable (1) counterclockwise. The guide groove (104) inside the turntable (1) will push the guide block (2) radially open, so that the guide block (2) extends out from the turntable cover (3) and inserts into the upper cover (6). S4. When the guide block (2) is inserted into the upper cover (6), the steel ball (802) of the ball screw (8) inside the guide block (2) pops out from the inside and engages with the U-shaped groove (604) inside the upper cover (6) to lock it, thus completing the fixing between the turntable (1) and the upper cover (6) and the installation of the instrument.

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