A clamp ammeter convenient for high-altitude measurement

Abstract

The present invention relates to the technical field of ammeters, and particularly relates to a clamp ammeter convenient for high-altitude measurement, which includes a support vertical rod and a detection unit. A hollow groove is formed in the support vertical rod, and a winding shaft is rotatably installed in the hollow groove. A limiting pull rope is fixedly installed on the winding shaft, and the top of the limiting pull rope extends out of the hollow groove and is fixedly connected to the bottom of the detection unit. An adjustment disk is rotatably installed at the top of the detection unit, an adjustment sliding groove is formed in the top of the adjustment disk, an adjustment slider is slidably installed in the adjustment sliding groove, and a clamp ammeter is fixedly installed at the top of the adjustment slider. The present invention designs a detection unit, which can position the position of the electrical circuit while detecting, and can drive the clamp ammeter to be automatically aligned with the electrical circuit in cooperation with the adjustment disk and the adjustment slider, solving the problems in the prior art that the operation of personnel is unstable and the clamp ammeter cannot be accurately aligned with the electrical circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of ammeters, and in particular to a clamp ammeter convenient for high-altitude measurement. Background Art

[0002] A clamp ammeter is an instrument used to measure the magnitude of the current in an operating electrical circuit, and it can measure the current without power interruption.

[0003] Generally, a clamp ammeter needs to be manually operated to clamp it on the operating electrical circuit for detection. However, the generally operating circuits are suspended at high altitudes. Currently, the conventional operation method is to lift the clamp ammeter to the height where the electrical circuit is located through a vertical pole, and then perform detection after clamping. However, this operation method has the following problems: 1. Manually supporting the vertical pole by hand will cause the clamp ammeter at the end of the vertical pole to shake greatly, and it cannot be accurately aligned with the electrical circuit to complete clamping, often requiring multiple operations. This situation reduces the detection efficiency of the clamp ammeter during high-altitude measurement. At the same time, the operator will be exhausted after long-term supporting the vertical pole, which will further reduce the detection efficiency; 2. Manually supporting the vertical pole will limit the length of the vertical pole, and it is often difficult to achieve detection when encountering some electrical circuits at higher heights. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the background art, and a clamp ammeter convenient for high-altitude measurement is proposed.

[0005] To achieve the above purpose, the present invention adopts the following technical scheme: A clamp ammeter convenient for high-altitude measurement, including a support vertical pole and a detection unit. A hollow groove is opened in the support vertical pole, the hollow groove penetrates through the top of the support vertical pole, a winding shaft is rotatably installed in the hollow groove, a limiting pulling rope is fixedly installed on the winding shaft, the detection unit is inserted into the top of the support vertical pole, and the top of the limiting pulling rope extends out of the hollow groove and is fixedly connected to the bottom of the detection unit;

[0006] The detection unit has a flat structure, a drone module is arranged on the outer side of the detection unit, an adjustment disk is rotatably installed on the top of the detection unit, an adjustment sliding groove is opened on the top of the adjustment disk, and an adjustment slider is slidably installed in the adjustment sliding groove. A clamp ammeter is fixedly installed on the top of the adjustment slider.

[0007] In the above-mentioned clamp ammeter convenient for high-altitude measurement, a plurality of insertion holes are opened on the top of the detection unit and located outside the adjustment disk, which are evenly distributed along its circumferential direction, the insertion holes penetrate through the detection unit, and spring pressure rods are inserted into the insertion holes. An induction module is fixedly installed on the outer wall of the spring pressure rod.

[0008] In the above-mentioned clamp ammeter convenient for high-altitude measurement, a linkage rod with an arc-shaped structure is fixedly installed at the top of the spring pressure rod. The linkage rods on several spring pressure rods are symmetrically arranged and distributed in a circular ring shape, and an elastic pull rope is fixedly installed between several linkage rods.

[0009] In the above-mentioned clamp ammeter convenient for high-altitude measurement, U-shaped fixed frames are fixedly installed on both sides of the clamp ammeter at the top of the adjusting slider. Two symmetrically arranged inflatable belts are fixedly installed on the inner side wall of the fixed frame. An air pump is fixedly installed inside the fixed frame. The air pump is communicated with one end of the inflatable belt, and the two inflatable belts on the same fixed frame are in contact with each other.

[0010] In the above-mentioned clamp ammeter convenient for high-altitude measurement, several positioning strips evenly distributed along the circumferential direction are fixedly installed on the outer side wall of the inflatable belt. Expansion grooves are opened on the outer walls of several positioning strips. The expansion grooves penetrate through the positioning strips and are communicated with the inflatable belt. Rubber blocks are inserted into the expansion grooves. A rubber layer is fixedly installed between the outer wall of the rubber block and the inner wall of the expansion groove. A spring pull rod is fixedly installed on the side of the rubber block close to the inflatable belt. The telescopic end of the spring pull rod is fixedly installed with a connecting pull rope, and the end of the connecting pull rope away from the spring pull rod is fixedly connected to the inner wall of the inflatable belt.

[0011] In the above-mentioned clamp ammeter convenient for high-altitude measurement, a semi-circular sponge pad is fixedly installed on the inner side wall of the inflatable belt, and the sponge pad is fixedly connected to the inner side wall of the fixed frame.

[0012] In the above-mentioned clamp ammeter convenient for high-altitude measurement, counterweight grooves are opened on both sides of the adjusting chute inside the adjusting disc. Counterweight blocks are slidably installed in the counterweight grooves. Counterweight pull ropes are fixedly installed at both ends of the counterweight blocks. The ends of the counterweight pull ropes away from the counterweight blocks extend into the adjusting chute and are respectively fixedly connected to both ends of the adjusting slider.

[0013] In the above-mentioned clamp ammeter convenient for high-altitude measurement, a plugging rod is fixedly installed at the bottom of the detection unit. The plugging rod is wrapped outside the limiting pull rope. Several buffer rings evenly distributed in a straight line are fixedly installed on the outer wall of the plugging rod. Several spring pressing blocks evenly distributed along the circumferential direction are inserted into the inner wall of the hollow groove. The spring pressing blocks have an arc-shaped structure. Several electric telescopic rods are fixedly installed on the inner wall of the supporting vertical rod below the spring pressing blocks. The telescopic ends of the electric telescopic rods are in contact with the spring pressing blocks.

[0014] Compared with the existing technology, the advantages of this clamp ammeter for convenient high-altitude measurement are as follows: The present invention designs a detection unit. Driven by the support vertical rod, the detection unit can be raised to a specified position for detection. During the detection, several spring pressure rods can be used to position the electrical circuit. Together with the adjustment disk and the adjustment slider, the clamp ammeter can be driven to automatically align with the electrical circuit, facilitating current detection. This solves the problems in the existing technology where the operation of personnel is unstable and the clamp ammeter cannot be accurately aligned with the electrical circuit. Moreover, driven by the drone module, the detection unit can detect electrical circuits at higher positions, further improving the detection efficiency of the clamp ammeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 FIG. is a schematic three-dimensional structure diagram of the support vertical rod and the detection unit in the present invention.

[0016] Figure 2 FIG. is a schematic cross-sectional structure diagram of the detection unit in the present invention.

[0017] Figure 3 FIG. is the present invention Figure 2 FIG. is a partially enlarged schematic structure diagram of part A in the present invention.

[0018] Figure 4 FIG. is the present invention Figure 2 FIG. is a partially enlarged schematic structure diagram of part B in the present invention.

[0019] Figure 5 FIG. is the present invention Figure 2 FIG. is a partially enlarged schematic structure diagram of part C in the present invention.

[0020] Figure 6 FIG. is the present invention Figure 2 FIG. is a partially enlarged schematic structure diagram of part D in the present invention.

[0021] Figure 7 FIG. is the present invention Figure 6 FIG. is a partially enlarged schematic structure diagram of part E in the present invention.

[0022] Figure 8 FIG. is a schematic three-dimensional structure diagram of the detection unit in the present invention.

[0023] Figure 9 FIG. is the present invention Figure 8 FIG. is a partially enlarged schematic structure diagram of part F in the present invention.

[0024] Figure 10 FIG. is a schematic cross-sectional structure diagram of the linkage rod in the present invention.

[0025] Figure 11 FIG. is the present invention Figure 10 FIG. is a partially enlarged schematic structure diagram of part G in the present invention.

[0026] Figure 12It is a schematic cross-sectional structure diagram of the adjustment disk in the present invention.

[0027] Figure 13 It is the present invention Figure 12 A schematic diagram of a partially enlarged structure at position H in the present invention.

[0028] In the figure: 1. Supporting vertical rod; 101. Hollow groove; 102. Reeling shaft; 103. Limit stay cord; 104. Spring pressing block; 105. Electric telescopic rod; 2. Detection unit; 201. Adjustment disk; 202. Adjustment sliding groove; 203. Adjustment slider; 204. Insertion hole; 205. Spring pressing rod; 206. Linking rod; 207. Elastic stay cord; 208. Fixed frame; 209. Inflatable belt; 210. Positioning strip; 211. Expansion groove; 212. Rubber block; 213. Rubber layer; 214. Spring pull rod; 215. Connecting stay cord; 216. Counterweight groove; 217. Counterweight block; 218. Counterweight stay cord; 219. Insertion rod; 220. Buffer ring. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0031] Referring to Figures 1 - 13 , a clamp ammeter convenient for high-altitude measurement includes a supporting vertical rod 1 and a detection unit 2. A hollow groove 101 is opened in the supporting vertical rod 1, the hollow groove 101 penetrates through the top of the supporting vertical rod 1, a reeling shaft 102 is rotatably installed in the hollow groove 101, a limit stay cord 103 is fixedly installed on the reeling shaft 102, the detection unit 2 is inserted into the top of the supporting vertical rod 1, the top of the limit stay cord 103 extends out of the hollow groove 101 and is fixedly connected to the bottom of the detection unit 2. The supporting vertical rod 1 is used to support the detection unit 2, and the supporting vertical rod 1 can increase the height of the detection unit 2. The detection unit 2 is used to detect the operating electrical circuit.

[0032] The detection unit 2 has a flat plate structure. An unmanned aerial vehicle module is arranged on the outer side of the detection unit 2. A regulating disc 201 is rotatably installed on the top of the detection unit 2. A regulating chute 202 is formed in the top of the regulating disc 201. A regulating slider 203 is slidably installed in the regulating chute 202. A clamp ammeter is fixedly installed on the top of the regulating slider 203. The take-up reel 102 is externally connected to a driving motor with forward and reverse functions. By rotating the take-up reel 102 and cooperating with the limiting pull rope 103, the detection unit 2 can be positioned. When the unmanned aerial vehicle module drives the detection unit 2 to rise, the limiting pull rope 103 can be released synchronously. When the detection unit 2 is retracted, the detection unit 2 can be guided so that the detection unit 2 is accurately inserted into the top of the support vertical rod 1. The regulating slider 203 is electrically driven. When the detection unit 2 rises to the lower part of the electrical circuit, according to the position of the electrical circuit, the regulating disc 201 automatically rotates and cooperates with the automatic movement of the regulating slider 203 to drive the clamp ammeter to move directly below the electrical circuit. At this time, when the detection unit 2 continues to rise, it can be accurately clamped outside the electrical circuit. The clamp ammeter has an automatic opening and closing structure, which solves the problem that the existing clamp ammeter has poor stability during high-altitude detection, resulting in inaccurate positioning, and improves the efficiency of the clamp ammeter during high-altitude detection.

[0033] A plurality of insertion holes 204 are formed in the top of the detection unit 2 and located outside the regulating disc 201, and are evenly distributed along its circumference. The insertion holes 204 penetrate the detection unit 2. Spring pressure rods 205 are inserted into the insertion holes 204. An induction module is fixedly installed on the outer wall of the spring pressure rods 205. A plurality of spring pressure rods 205 are distributed in a circular ring along the regulating disc 201. When the detection unit 2 rises to the lower part of the electrical circuit, the bottom of the electrical circuit will contact the spring pressure rod 205 at the corresponding position. When the detection unit 2 continues to rise, the electrical circuit will squeeze the spring pressure rod 205 in contact with it. When the spring pressure rod 205 is squeezed, a height difference will be generated between it and other non-squeezed spring pressure rods 205. At this time, the corresponding induction module can transmit a signal to the controller, and the controller operates the regulating disc 201 and the regulating slider 203 to move the clamp ammeter quickly to directly below the electrical circuit. When the detection unit 2 rises to the designated position, it can drive the clamp ammeter to accurately clamp on the electrical circuit.

[0034] A connecting rod 206 with an arc-shaped structure is fixedly installed on the top of the spring pressure rod 205. The connecting rods 206 on the several spring pressure rods 205 are symmetrically arranged and distributed in a circular ring. An elastic pull rope 207 is fixedly installed between the several connecting rods 206. The connecting rod 206 can increase the contact area between the spring pressure rod 205 and the electrical circuit, and can cope with electrical circuits of various sizes. Since the spring pressure rod 205 and the connecting rod 206 are in a T-shaped structure, there is a certain gap between two adjacent spring pressure rods 205. When the electrical circuit squeezes the corresponding spring pressure rod 205 and contracts, it is easy to get stuck in the gap between the two spring pressure rods 205. The elastic pull rope 207 can prevent the electrical circuit from being stuck in the gap between the two spring pressure rods 205, which facilitates the subsequent detection unit 2 to be separated from the electrical circuit.

[0035] A U-shaped fixing frame 208 is fixedly installed on the top of the adjusting slider 203 and on both sides of the clamp-on ammeter. Two symmetrically arranged inflatable belts 209 are fixedly installed on the inner side wall of the fixing frame 208. An air pump is fixedly installed inside the fixing frame 208, and the air pump is connected to one end of the inflatable belt 209. The two inflatable belts 209 on the same fixing frame 208 conflict with each other. When the clamp-on ammeter on the detection unit 2 is clamped on the electrical circuit, the electrical circuit will be synchronously connected between the U-shaped fixing frames 208. When the electrical circuit is connected between the fixing frames 208, the two inflatable belts 209 will be pushed open. At this time, the two inflatable belts 209 are wrapped around the outside of the electrical circuit. At this time, the inflatable belts 209 are inflated and pressurized by the air pump, so that the two inflatable belts 209 expand and conflict with each other to finally clamp the electrical circuit. At this time, under the clamping action of the two inflated inflatable belts 209, the detection unit 2 can be suspended on the electrical circuit.

[0036] A number of positioning strips 210 evenly distributed along the circumferential direction are fixedly installed on the outer side wall of the inflatable belt 209. Expansion grooves 211 are formed on the outer walls of the number of positioning strips 210. The expansion grooves 211 penetrate through the positioning strips 210 and communicate with the inflatable belt 209. Rubber blocks 212 are inserted into the expansion grooves 211. A rubber layer 213 is fixedly installed between the outer wall of the rubber block 212 and the inner wall of the expansion groove 211. A spring pull rod 214 is fixedly installed on one side of the rubber block 212 close to the inflatable belt 209. A connecting pull rope 215 is fixedly installed at the telescopic end of the spring pull rod 214. One end of the connecting pull rope 215 far from the spring pull rod 214 is fixedly connected to the inner wall of the inflatable belt 209. When the inflatable belt 209 is inflated and expanded, it will drive a number of positioning strips 210 on the outer wall to be tightened synchronously. The tightened positioning strips 210 abut against the outside of the electrical circuit, which can increase the clamping force on the electrical circuit and improve the stability after clamping. After the inflatable belt 209 is inflated and expanded, it will push the rubber block 212 outwards. After being pushed, the rubber block 212 will extend outwards and abut against the outer wall of the electrical circuit. By the abutment of the rubber block 212, the friction coefficient between the electrical circuit and the inflatable belt 209 can be increased, and the clamping effect of the inflatable belt 209 can be further improved.

[0037] A semi-circular sponge pad is fixedly installed on the inner side wall of the inflatable belt 209. The sponge pad is fixedly connected to the inner wall side of the fixing frame 208. The sponge pad can provide preliminary support for the inflatable belt 209 to prevent the two inflatable belts 209 from being too soft when not inflated and expanded, which is convenient for the insertion of the electrical circuit.

[0038] Counterweight grooves 216 are formed on both sides of the adjustment chute 202 inside the adjustment disc 201. Counterweight blocks 217 are slidably installed in the counterweight grooves 216. Weight pull ropes 218 are fixedly installed at both ends of the counterweight blocks 217. One end of the weight pull rope 218 far from the counterweight block 217 extends into the adjustment chute 202 and is fixedly connected to both ends of the adjustment slider 203 respectively. The counterweight blocks 217 in the counterweight grooves 216 are used to counterweight the detection unit 2 to prevent the center of gravity of the detection unit 2 from shifting and tilting after the adjustment slider 203 drives the clamp ammeter to move. When the adjustment slider 203 moves in a specified direction, it will pull the counterweight blocks 217 to move synchronously in the direction opposite to the moving direction of the adjustment slider 203 through the weight pull ropes 218. The weight of the counterweight blocks 217 is equivalent to the weight of the adjustment slider 203 and the clamp ammeter.

[0039] A plugging rod 219 is fixedly installed at the bottom of the detection unit 2. The plugging rod 219 is wrapped around the outer side of the limiting pull rope 103. A number of buffer rings 220 evenly distributed in a straight line are fixedly installed on the outer wall of the plugging rod 219. A number of spring pressing blocks 104 evenly distributed along the circumferential direction thereof are inserted into the inner wall of the hollow groove 101. The spring pressing blocks 104 are of an arc-shaped structure. A number of electric telescopic rods 105 are fixedly installed on the inner wall of the supporting vertical rod 1 and below the spring pressing blocks 104. The telescopic ends of the electric telescopic rods 105 are in contact with the spring pressing blocks 104. The plugging rod 219 is used to be inserted into the hollow groove 101. By inserting the plugging rod 219, the stability of the detection unit 2 in the initial state can be improved. At the same time, when the detection unit 2 in the flight state drives the plugging rod 219 to be inserted into the hollow groove 101 under the traction of the limiting pull rope 103, a large impact force will be generated, which is likely to damage the detection unit 2. When the plugging rod 219 is inserted into the hollow groove 101, it will drive a number of buffer rings 220 to intermittently contact the spring pressing blocks 104 and squeeze the spring pressing blocks 104. Through the continuous contraction and extrusion of the spring pressing blocks 104, the contact with a number of buffer rings 220 can be achieved, the friction force can be increased, and the impact force after the detection unit 2 descends can be slowed down. After the plugging rod 219 is completely inserted into the hollow groove 101, operate the telescopic end of the electric telescopic rod 105 to extend and be in contact with the spring pressing block 104. At this time, under the limiting action of the telescopic end of the electric telescopic rod 105, the spring pressing block 104 can no longer expand and contract. At this time, the buffer ring 220 at a specified position can be limited and locked through the spring pressing block 104, so as to prevent the detection unit 2 from falling during the process of moving the supporting vertical rod 1 and causing damage to the clamp ammeter. However, when it is necessary to operate the detection unit 2 to take off, operate the electric telescopic rod 105 to contract and release the spring pressing block 104. At this time, under the drive of the drone module, a number of buffer rings 220 can be driven to squeeze the spring pressing block 104 again and finally pull the plugging rod 219 out of the hollow groove 101.

[0040] Further explanation, the above-mentioned fixed connection, unless otherwise clearly specified and limited, should be understood in a broad sense. For example, it can be welding, gluing, or integrally formed setting, etc., which are conventional means well-known to those skilled in the art.

[0041] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A clamp-on ammeter convenient for high-altitude measurement, comprising a support pole (1) and a detection unit (2), characterized in that: A hollow groove (101) is provided in the support pole (1), the hollow groove (101) passes through the top of the support pole (1), a reel (102) is rotatably mounted in the hollow groove (101), a limit pull rope (103) is fixedly mounted on the reel (102), the detection unit (2) is inserted into the top of the support pole (1), the top of the limit pull rope (103) extends out of the hollow groove (101) and is fixedly connected to the bottom of the detection unit (2); The detection unit (2) is of a flat plate structure, a drone module is arranged on the outside of the detection unit (2), an adjustment disk (201) is rotatably mounted on the top of the detection unit (2), an adjustment slide groove (202) is provided on the top of the adjustment disk (201), an adjustment slider (203) is slidably mounted in the adjustment slide groove (202), and a clamp-on ammeter is fixedly mounted on the top of the adjustment slider (203); A plurality of plug holes (204) evenly distributed along the circumference of the detection unit (2) are provided at the top of the detection unit (2) and located on the outside of the adjustment disk (201); the plug holes (204) pass through the detection unit (2); a spring pressure rod (205) is inserted into the plug hole (204); and a sensing module is fixedly mounted on the outer wall of the spring pressure rod (205); A connecting rod (206) with an arc-shaped structure is fixedly installed on the top of the spring pressure rod (205); a plurality of connecting rods (206) on the spring pressure rod (205) are symmetrically arranged and distributed in a circular ring; and an elastic pull rope (207) is fixedly installed between the plurality of connecting rods (206).

2. A clamp-on ammeter for high-altitude measurement according to claim 1, characterized in that: A U-shaped fixing frame (208) is fixedly mounted on the top of the adjusting slider (203) and on both sides of the clamp-on ammeter. Two symmetrically arranged air belts (209) are fixedly mounted on the inner side wall of the fixing frame (208). An air pump is fixedly mounted inside the fixing frame (208). The air pump is connected to one end of the air belt (209). The two air belts (209) on the same fixing frame (208) are in contact with each other.

3. A clamp-on ammeter convenient for high-altitude measurement according to claim 2, characterized in that: A plurality of positioning strips (210) evenly distributed along the circumference of the inflatable belt (209) are fixedly mounted on the outer wall of the inflatable belt (209); an expansion groove (211) is formed on the outer walls of the plurality of positioning strips (210); the expansion groove (211) penetrates the positioning strip (210) and is connected to the inflatable belt (209); a rubber block (212) is inserted into the expansion groove (211); a rubber layer (213) is fixedly mounted between the outer wall of the rubber block (212) and the inner wall of the expansion groove (211); a spring pull rod (214) is fixedly mounted on the side of the rubber block (212) close to the inflatable belt (209); a connecting pull rope (215) is fixedly mounted on the telescopic end of the spring pull rod (214); and one end of the connecting pull rope (215) away from the spring pull rod (214) is fixedly connected to the inner wall of the inflatable belt (209).

4. A clamp-on ammeter convenient for high-altitude measurement according to claim 2, characterized in that: A sponge pad with a semicircular structure is fixedly mounted on the inner side wall of the inflatable belt (209), and the sponge pad is fixedly connected to the inner wall side of the fixing frame (208).

5. The clamp-on ammeter for high-altitude measurement according to claim 1, characterized in that: A counterweight groove (216) is provided in the adjusting disk (201) and on both sides of the adjusting slot (202). A counterweight block (217) is slidably mounted in the counterweight groove (216). Counterweight pull ropes (218) are fixedly mounted at both ends of the counterweight block (217). One end of the counterweight pull rope (218) away from the counterweight block (217) extends into the adjusting slot (202) and is fixedly connected to both ends of the adjusting slider (203).

6. The clamp-on ammeter for high-altitude measurement according to claim 1, characterized in that: A plug-in rod (219) is fixedly mounted on the bottom of the detection unit (2), the plug-in rod (219) is wrapped around the outside of the limit pull rope (103), a plurality of buffer rings (220) are fixedly mounted on the outer wall of the plug-in rod (219) and are evenly distributed in a straight line, a plurality of spring pressure blocks (104) are inserted on the inner wall of the hollow groove (101) and are evenly distributed along its circumference, the spring pressure blocks (104) are in an arc-shaped structure, and a plurality of electric telescopic rods (105) are fixedly mounted on the inner wall of the support pole (1) and below the spring pressure blocks (104), the telescopic ends of the electric telescopic rods (105) being in contact with the spring pressure blocks (104).

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