Clamp-type ammeter convenient for high-altitude measurement

Abstract

The invention relates to the technical field of ampere meters, in particular to a clamp-type ampere meter convenient for high-altitude measurement, which comprises a supporting vertical rod and a detection unit, a hollow groove is formed in the supporting vertical rod, a winding shaft is rotatably mounted in the hollow groove, and a limiting pull rope is fixedly mounted on the winding shaft; 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 adjusting disc is rotationally installed at the top of the detection unit, an adjusting sliding groove is formed in the top of the adjusting disc, an adjusting sliding block is slidably installed in the adjusting sliding groove, and a clamp type ampere meter is fixedly installed at the top of the adjusting sliding block. According to the invention, the detection unit is designed, the position of an electrical circuit can be positioned in cooperation with a plurality of spring pressing rods during detection, a clamp-type ammeter can be driven to be automatically aligned with the electrical circuit in cooperation with an adjusting disc and an adjusting sliding block, and the problems that in the prior art, personnel operation is not stable, and the working efficiency is high are solved. And the clamp-type ammeter and the electrical circuit cannot be accurately aligned.

Description

Technical Field

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

[0002] A clamp ammeter is an instrument used to measure the current in a running electrical circuit. It can measure the current without cutting off the power.

[0003] General clamp-on ammeters require manual operation and must be clamped on a running electrical line for detection. However, running lines are generally suspended at high altitudes. Currently, the conventional method of operation is to lift the clamp-on ammeter to the height of the electrical line using a pole and perform detection after clamping. However, this method of operation has the following problems when used: 1. Manual support of the pole will cause the clamp-on ammeter at the end of the pole to shake greatly, and the electrical line cannot be accurately aligned to complete clamping, and multiple operations are often required. This reduces the detection efficiency of the clamp-on ammeter when performing high-altitude measurements. At the same time, the operator will become exhausted if he supports the pole for a long time, which will further reduce the detection efficiency. 2. Manual support of the pole will limit the length of the pole, and it is often difficult to detect some electrical lines at higher altitudes. Summary of the invention

[0004] The purpose of the present invention is to solve the problems in the background technology and to propose a clamp-on ammeter which is convenient for high-altitude measurement.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a clamp-type ammeter convenient for high-altitude measurement, comprising a support pole and a detection unit, wherein a hollow groove is opened in the support pole, the hollow groove passes through the top of the support pole, a reel is rotatably installed in the hollow groove, a limit pull rope is fixedly installed on the reel, the detection unit is inserted at the top of the support pole, and the top of the limit pull rope extends out of the hollow groove and is fixedly connected to the bottom of the detection unit; The detection unit has a flat structure, and a drone module is arranged on the outside of the detection unit. An adjustment disk is rotatably installed on the top of the detection unit, an adjustment slot is opened on the top of the adjustment disk, an adjustment slider is slidably installed in the adjustment slot, and a clamp-on ammeter is fixedly installed on the top of the adjustment slider.

[0006] In the above-mentioned clamp-on ammeter that is convenient for high-altitude measurement, a plurality of plug holes evenly distributed along the circumference are provided at the top of the detection unit and located on the outside of the adjustment disk. The plug holes pass through the detection unit, and a spring pressure rod is inserted into the plug holes. An induction module is fixedly installed on the outer wall of the spring pressure rod.

[0007] In the above-mentioned clamp-on ammeter that is convenient for high-altitude measurement, a connecting rod with an arc-shaped structure is fixedly installed on the top of the spring pressure rod, several connecting rods on the spring pressure rod are symmetrically arranged and distributed in a circular ring shape, and elastic pull ropes are fixedly installed between the several connecting rods.

[0008] In the above-mentioned clamp-on ammeter that is convenient for high-altitude measurement, a U-shaped fixing frame is fixedly installed on the top of the adjusting slider and on both sides of the clamp-on ammeter, and two symmetrically arranged inflatable belts are fixedly installed on the inner side wall of the fixing frame. An air pump is fixedly installed inside the fixing frame, and the air pump is connected to one end of the inflatable belt. The two inflatable belts on the same fixing frame are in conflict with each other.

[0009] In the above-mentioned clamp-on ammeter that is convenient for high-altitude measurement, a number of positioning strips evenly distributed along the circumference are fixedly installed on the outer side wall of the inflatable belt, and expansion grooves are opened on the outer walls of the positioning strips. The expansion grooves penetrate the positioning strips and are connected to the inflatable belt. A rubber block is inserted in the expansion groove, and 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, and a connecting pull rope is fixedly installed on the telescopic end of the spring pull rod, 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.

[0010] In the above-mentioned clamp-on ammeter convenient for high-altitude measurement, a sponge pad with a semicircular structure is fixedly installed on the inner wall of the inflatable belt, and the sponge pad is fixedly connected to the inner wall side of the fixing frame.

[0011] In the above-mentioned clamp-on ammeter that is convenient for high-altitude measurement, counterweight grooves are provided in the adjusting disk and on both sides of the adjusting slide slot, a counterweight block is slidably installed in the counterweight groove, and counterweight ropes are fixedly installed at both ends of the counterweight block, and the end of the counterweight rope away from the counterweight block extends into the adjusting slide slot and is fixedly connected to the two ends of the adjusting slider, respectively.

[0012] In the above-mentioned clamp-on ammeter that is convenient for high-altitude measurement, a plug-in rod is fixedly installed at the bottom of the detection unit, and the plug-in rod is wrapped around the outside of the limit pull rope. A plurality of buffer rings evenly distributed in a straight line are fixedly installed on the outer wall of the plug-in rod, and a plurality of spring pressure blocks evenly distributed along its circumference are inserted on the inner wall of the hollow groove, and the spring pressure blocks are in an arc-shaped structure. A plurality of electric telescopic rods are fixedly installed on the inner wall of the supporting pole and below the spring pressure blocks, and the telescopic ends of the electric telescopic rods are in contact with the spring pressure blocks.

[0013] Compared with the existing technology, the advantages of the clamp-on ammeter which is convenient for high-altitude measurement are as follows: the present invention designs a detection unit, which can be raised to a specified position for detection under the push of a supporting pole, and can locate the position of the electrical circuit in conjunction with a number of spring pressure rods during detection, and can drive the clamp-on ammeter to automatically align with the electrical circuit in conjunction with an adjustment disk and an adjustment slider, which is convenient for current detection, and solves the problem in the existing technology that the operation of personnel is unstable and the clamp-on ammeter cannot be accurately aligned with the electrical circuit, and driven by the drone module, the detection unit can detect electrical circuits at higher places, further improving the detection efficiency of the clamp-on ammeter. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the three-dimensional structure of the supporting pole and the detection unit in the present invention.

[0015] Figure 2 It is a schematic diagram of the cross-sectional structure of the detection unit in the present invention.

[0016] Figure 3 The present invention Figure 2 Schematic diagram of the local enlarged structure at point A in the middle.

[0017] Figure 4 The present invention Figure 2 Schematic diagram of the local enlarged structure at point B in the middle.

[0018] Figure 5 The present invention Figure 2 Schematic diagram of the local enlarged structure at point C in the middle.

[0019] Figure 6 The present invention Figure 2 Schematic diagram of the local enlarged structure at point D in the middle.

[0020] Figure 7 The present invention Figure 6 Schematic diagram of the local enlarged structure at point E in the middle.

[0021] Figure 8 It is a schematic diagram of the three-dimensional structure of the detection unit in the present invention.

[0022] Fig. 9 The present invention Figure 8 Schematic diagram of the local enlarged structure at F in the middle.

[0023] Fig.10 It is a schematic cross-sectional structural diagram of the linkage rod in the present invention.

[0024] Fig.11 The present invention Fig.10 Schematic diagram of the local enlarged structure at G in the middle.

[0025] Fig.12It is a schematic cross-sectional structural diagram of the adjustment disk in the present invention.

[0026] Fig.13 The present invention Fig.12 Schematic diagram of the local enlarged structure at H in the middle.

[0027] In the figure: 1. Support pole; 101. Hollow groove; 102. Winding shaft; 103. Limiting rope; 104. Spring pressure block; 105. Electric telescopic rod; 2. Detection unit; 201. Adjustment disk; 202. Adjustment slide groove; 203. Adjustment slider; 204. Plug-in hole; 205. Spring pressure rod; 206. Linking rod; 207. Elastic rope; 208. Fixed frame; 209. Inflatable belt; 210. Positioning strip; 211. Expansion groove; 212. Rubber block; 213. Rubber layer; 214. Spring pull rod; 215. Connecting rope; 216. Counterweight groove; 217. Counterweight block; 218. Counterweight rope; 219. Plug-in rod; 220. Buffer ring. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are 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 cannot be understood as a limitation on the present invention.

[0030] Reference Figure 1-Figure 13 A clamp-on ammeter convenient for high-altitude measurement comprises a supporting pole 1 and a detecting unit 2. A hollow groove 101 is provided in the supporting pole 1, and the hollow groove 101 passes through the top of the supporting pole 1. A winding shaft 102 is rotatably installed in the hollow groove 101, and a limit pull rope 103 is fixedly installed on the winding shaft 102. The detecting unit 2 is inserted into the top of the supporting pole 1, and the top of the limit pull rope 103 extends out of the hollow groove 101 and is fixedly connected to the bottom of the detecting unit 2. The supporting pole 1 is used to support the detecting unit 2, and the supporting pole 1 can increase the height of the detecting unit 2. The detecting unit 2 is used to detect the running electrical circuit.

[0031] The detection unit 2 is a flat plate structure, and a drone module is arranged on the outside of the detection unit 2. An adjusting disk 201 is rotatably installed on the top of the detection unit 2. An adjusting slot 202 is provided on the top of the adjusting disk 201. An adjusting slider 203 is slidably installed in the adjusting slot 202. A clamp-type ammeter is fixedly installed on the top of the adjusting slider 203. The winding shaft 102 is externally connected to a driving motor with forward and reverse functions. The detection unit 2 can be positioned by rotating the winding shaft 102 in cooperation with the limit pull rope 103. The limit pull rope 103 can be released synchronously when the drone module drives the detection unit 2 to rise. When the detection unit 2 is retracted, the detection unit 2 can be positioned. The detection unit 2 is guided so that the detection unit 2 is accurately inserted on the top of the supporting pole 1. The adjusting slider 203 is electrically driven. When the detection unit 2 rises to the bottom of the electrical circuit, the adjusting disk 201 automatically rotates according to the position of the electrical circuit to cooperate with the automatic movement of the adjusting slider 203, driving the clamp-type ammeter to move to the bottom of the electrical circuit. At this time, when the detection unit 2 continues to rise, it can be accurately clamped on the outside of the electrical circuit. The clamp-type ammeter is an automatic opening and closing structure, which solves the problem of inaccurate positioning caused by poor stability of existing clamp-type ammeters during high-altitude detection, and improves the efficiency of the clamp-type ammeter during high-altitude detection.

[0032] A plurality of plug-in holes 204 evenly distributed along the circumference thereof are provided at the top of the detection unit 2 and located on the outside of the adjusting disk 201. The plug-in holes 204 pass through the detection unit 2. A spring pressure rod 205 is inserted in the plug-in hole 204. A sensing module is fixedly installed on the outer wall of the spring pressure rod 205. The plurality of spring pressure rods 205 are distributed in a circular ring shape along the adjusting disk 201. When the detection unit 2 rises to the bottom 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 drop will be generated between the spring pressure rod 205 and other spring pressure rods 205 that have not been squeezed. At this time, the signal can be transmitted to the controller through the corresponding sensing module. The adjusting disk 201 and the adjusting slider 203 are operated by the controller to quickly move the clamp-type ammeter to the bottom of the electrical circuit. When the detection unit 2 rises to the specified position, the clamp-type ammeter can be driven to be accurately clamped on the electrical circuit.

[0033] 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.

[0034] 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.

[0035] A plurality of positioning strips 210 evenly distributed along the circumference of the inflatable belt 209 are fixedly installed on the outer wall of the inflatable belt 209, and expansion grooves 211 are opened on the outer walls of the plurality of positioning strips 210, and the expansion grooves 211 penetrate the positioning strips 210 and are connected to the inflatable belt 209. A rubber block 212 is inserted into the expansion groove 211, and 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, and a connecting pull rope 215 is fixedly installed on the telescopic end of the spring pull rod 214, and the connecting pull rope 215 is away from the spring pull rod 2 One end of 14 is fixedly connected to the inner wall of the inflatable belt 209. When the inflatable belt 209 is inflated, it will drive several positioning strips 210 on the outer wall to be tightened synchronously. The tightened positioning strips 210 will abut against the outside of the electrical circuit, which can increase the clamping force of the electrical circuit and improve the stability after clamping. When the inflatable belt 209 is inflated, it will push the rubber block 212 outward. After being pushed, the rubber block 212 will extend outward and abut against the outer wall of the electrical circuit. The friction coefficient between the electrical circuit and the inflatable belt 209 can be increased through the abutment of the rubber block 212, thereby further improving the clamping effect of the inflatable belt 209.

[0036] A semicircular sponge pad is fixedly installed on the inner wall of the inflatable belt 209, and 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, thereby facilitating the insertion of electrical circuits.

[0037] Counterweight slots 216 are provided in the adjusting disk 201 and on both sides of the adjusting slot 202. Counterweight blocks 217 are slidably installed in the counterweight slots 216. Counterweight ropes 218 are fixedly installed at both ends of the counterweight block 217. The end of the counterweight rope 218 away from the counterweight block 217 extends into the adjusting slot 202 and is fixedly connected to the two ends of the adjusting slider 203. The counterweight block 217 in the counterweight slot 216 is used to counterweight the detection unit 2 to prevent the detection unit 2 from being tilted due to the center of gravity shift of the detection unit 2 after the adjusting slider 203 drives the clamp-on ammeter to move. When the adjusting slider 203 moves in a specified direction, the counterweight block 217 will be pulled by the counterweight rope 218 to move synchronously in the direction opposite to the moving direction of the adjusting slider 203. The weight of the counterweight block 217 is equivalent to the weight of the adjusting slider 203 and the clamp-on ammeter.

[0038] A plug-in rod 219 is fixedly installed at the bottom of the detection unit 2, and the plug-in rod 219 is wrapped around the outside of the limit pull rope 103. A plurality of buffer rings 220 are fixedly installed 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. A plurality of electric telescopic rods 105 are fixedly installed on the inner wall of the support pole 1 and below the spring pressure blocks 104. The electric telescopic rod 105 The telescopic end of 5 contacts the spring pressure block 104, and the plug-in rod 219 is used to be inserted into the hollow groove 101. The insertion of the plug-in rod 219 can improve the stability of the detection unit 2 in the initial state. At the same time, when the detection unit 2 in the flight state drives the plug-in rod 219 to be inserted into the hollow groove 101 under the traction of the limit pull rope 103, a large impact force will be generated, which is easy to cause damage to the detection unit 2. When the plug-in rod 219 is inserted into the hollow groove 101, it will drive several buffer rings 220 is in intermittent contact with the spring pressure block 104 and squeezes the spring pressure block 104. The continuous contraction and squeezing of the spring pressure block 104 can contact several buffer rings 220, thereby increasing the friction force and slowing down the impact force after the detection unit 2 descends. When the plug-in rod 219 is fully inserted into the hollow groove 101, the telescopic end of the electric telescopic rod 105 is extended and contacted with the spring pressure block 104. At this time, under the limiting action of the telescopic end of the electric telescopic rod 105, the spring pressure block 104 can no longer be extended. At this time, the buffer ring 220 at the specified position can be limited and locked by the spring pressure block 104 to prevent the detection unit 2 from falling during the moving support pole 1 and causing damage to the clamp ammeter. However, when the detection unit 2 needs to be operated to take off, the electric telescopic rod 105 is operated to contract and release the spring pressure block 104. At this time, driven by the drone module, several buffer rings 220 can be driven to squeeze the spring pressure block 104 again and finally bring the plug-in rod 219 out of the hollow groove 101.

[0039] It is further explained that the above-mentioned fixed connection should be understood in a broad sense unless otherwise clearly specified and limited. For example, it can be welding, gluing, or one-piece molding, etc., which are conventional means well known to those skilled in the art.

[0040] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which 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 outside 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).

2. A clamp-on ammeter for high-altitude measurement according to claim 1, characterized in that: 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 outside the adjustment disk (201); the plug holes (204) penetrate 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).

3. A clamp-on ammeter convenient for high-altitude measurement according to claim 2, characterized in that: 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).

4. A clamp-on ammeter convenient 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.

5. A clamp-on ammeter for high-altitude measurement according to claim 4, 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).

6. A clamp-on ammeter for high-altitude measurement according to claim 4, 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).

7. 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).

8. 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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