A downhole equipment maintenance tool

Abstract

The present invention provides a downhole equipment maintenance tool, which relates to the field of power maintenance tools, comprising: side columns; a wellhead support rod fixedly connected to the top of two side columns by welding; five No. 1 cross bars fixedly arranged between the two No. 1 cross bar support rods; a spring is also provided on the top of each support block; a plurality of anti-slip spikes are fixedly provided on the left and right sides of the bottom of the anti-slip spike support plate; a No. 2 cross bar support rod is slidably embedded and installed on the inner side of each of the two side columns; a total of five No. 2 cross bars are installed between the two No. 2 cross bar support rods; two limit columns are fixedly and symmetrically provided on the top of the four lower No. 2 cross bars; two pull ropes are tied to the top of each of the five No. 2 cross bars; and two tension springs are also fixed on the top of each of the five No. 2 cross bars. This device can automatically adjust during telescopic adjustment, making adjustment more convenient and without the need for additional circuits, thus maintaining low usage costs.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power maintenance tools, in particular to a downhole equipment maintenance tool. Background Art

[0002] In order to improve the aesthetics of the city, power lines are mostly laid underground, and some power wells are set up at corresponding locations. Power equipment is installed in these power wells. When the power equipment needs to be inspected and repaired, maintenance personnel will use ladders and other tools to enter the power wells for inspection and maintenance.

[0003] In order to facilitate maintenance personnel to enter deep wells to repair power equipment, the existing power well inspection ladders also need to take into account the convenience of transportation and save space when placed in a vehicle. Therefore, these ladders are mostly set to a telescopic structure. However, they need to be adjusted manually or controlled by an electric cylinder or motor during extension and retraction, which makes adjustment inconvenient. The cost of use is high after adding circuits. In addition, the tops of these inspection ladders are placed on the edge of the power well when in use. However, if the maintenance personnel use too much force during the inspection, it will bring a reverse force to the inspection ladder, and the top of the inspection ladder is easy to move, resulting in poor stability during use. Summary of the Invention

[0004] In view of this, the present invention provides a downhole equipment maintenance tool to solve the problems of inconvenient telescopic adjustment, high use cost and poor stability of the current power well maintenance ladder.

[0005] The present invention provides a downhole equipment maintenance tool, which specifically includes: a side column; a wellhead support rod is fixedly connected to the top of the two side columns by welding; five support blocks are fixedly provided on one side of the two side columns, and a No. 1 cross bar support rod is slidably installed on the support blocks on one side of the two side columns; a total of five No. 1 cross bars are fixedly provided between the two No. 1 cross bars; a spring is also provided on the top of each support block; an anti-slip spike support plate is slidably provided on the inner side of the wellhead support rod, and an anti-slip spike support plate is provided. The bottom of the nail support plate is fixedly connected to the top of the two No. 1 cross bar support rods; a number of anti-slip nails are fixedly set on the left and right sides of the bottom of the anti-slip nail support plate; a No. 2 cross bar support rod is slidably embedded in the inner sides of the two side columns; a total of five No. 2 cross bars are installed between the two No. 2 cross bar support rods; two limit columns are fixedly and symmetrically set on the tops of the four No. 2 cross bars at the bottom; two pull ropes are tied to the tops of the five No. 2 cross bars; two tension springs are also fixedly set on the tops of the five No. 2 cross bars.

[0006] Furthermore, a cylindrical hole with an inner diameter equal to the outer diameter of the No. 2 cross bar support rod is provided on the inner side of the side column, a rectangular plate is provided on the front and rear sides of the top of the No. 2 cross bar support rod, and a vertical groove with a width equal to the front and rear rectangular plates on the top of the No. 2 cross bar support rod is provided on the front and rear outer walls of the side column.

[0007] Furthermore, a circular plate is provided on both sides of the left and right sides of the No. 2 cross bar, the lowest No. 2 cross bar is fixedly connected to the bottom ends of the two No. 2 cross bar support rods, and a circular hole with an inner diameter equal to the outer diameter of the No. 2 cross bar support rod is provided on the circular plates on the left and right sides of the four No. 2 cross bars above, the top ends of the pull ropes and tension springs at the top of the four No. 2 cross bars below are fixedly connected to the bottom of the No. 2 cross bar above them, and the top ends of the pull ropes and tension springs at the top of the top No. 2 cross bar are fixedly connected to the bottom of the lowest No. 1 cross bar.

[0008] Furthermore, the cross bar No. 1 is located above the five groups of support blocks, and the bottom ends of the springs are in close contact with the top surfaces of the support blocks, and the top ends of the springs are in close contact with the bottom surface of the cross bar No. 1.

[0009] Furthermore, the height of the limiting columns is 10 cm, and the length of the pull ropes is 30 cm.

[0010] Furthermore, a rectangular cavity is provided on the inner side of the wellhead support rod, and the anti-slip nail support plate can slide up and down in this rectangular cavity. Several circular holes are provided on the left and right sides of the bottom of the wellhead support rod, and the outer diameter of the anti-slip nail is equal to the inner diameter of these circular holes.

[0011] Furthermore, when the No. 1 cross bar and the anti-skid nail support plate slide to the top, the bottom ends of the anti-skid nails will be located in the circular holes on the left and right sides of the bottom of the wellhead support bar, and when the No. 1 cross bar and the anti-skid nail support plate slide to the bottom, the bottom ends of the anti-skid nails will extend downward.

[0012] The present invention provides a downhole equipment maintenance tool, which has the following beneficial effects:

[0013] 1. When the No. 2 crossbar in the present invention is stepped on by maintenance personnel, it will automatically fall a certain distance due to the gravity, thereby increasing the overall length of the ladder, making it easier for maintenance personnel to enter the deep well to inspect the power equipment. After the maintenance personnel leave the No. 2 crossbar, the tension spring on the top of the crossbar will pull it up and retract, thereby taking into account the convenience of transportation and saving the space occupied when placed in the car. Compared with the current power well inspection ladder, this device can automatically adjust during telescopic adjustment, which is more convenient to adjust, and there is no need to increase the circuit, keeping the cost of use low.

[0014] 2. When the No. 1 crossbar in the present invention is stepped on, the anti-slip spike support plate and the anti-slip spikes will be driven downward through the No. 1 crossbar support rod, so that the anti-slip spikes can be inserted into the ground to enhance the grip, and when stepping on the No. 2 crossbar, it can also be pulled down, thereby effectively preventing the maintenance ladder from moving, and the anti-slip spikes will slide up and hide when the maintenance personnel leave the ladder. Compared with the current power well maintenance ladder, this device is more stable when in use, and can also prevent the anti-slip spikes from scratching the maintenance personnel when moving, and is also safer to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments are briefly introduced below.

[0016] In the attached figure:

[0017] Figure 1 It is a schematic diagram of the main shaft side structure after the second cross bar is retracted upward in an embodiment of the present invention.

[0018] Figure 2 It is a schematic diagram of the main shaft side structure after the second cross bar portion is moved downward in an embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the main shaft side structure after all the second cross bars are moved downwards according to an embodiment of the present invention.

[0020] Figure 4 It is a partial cross-sectional structural schematic diagram of the cooperation between the side column and the second crossbar support rod according to an embodiment of the present invention.

[0021] Figure 5 It is a schematic diagram of the axial side structure of the second crossbar in an embodiment of the present invention.

[0022] Figure 6 It is a schematic diagram of the partial axial structure of the side column after cutting of an embodiment of the present invention.

[0023] Figure 7 It is a structural schematic diagram of an embodiment of the present invention in which the wellhead support rod is cut and the anti-slip spike support plate is moved upward.

[0024] Figure 8 It is a structural schematic diagram of an embodiment of the present invention in which the wellhead support rod is cut and the anti-slip spike support plate is moved downward.

[0025] Reference Signs List

[0026] 1. Side column; 2. Wellhead support rod; 3. Crossbar No. 1; 4. Support block; 5. Crossbar No. 1 support rod; 6. Spring; 7. Anti-slip support plate; 8. Anti-slip spike; 9. Crossbar No. 2 support rod; 10. Crossbar No. 2; 11. Limit column; 12. Pull rope; 13. Tension spring. DETAILED DESCRIPTION

[0027] In order to make the purpose, solution and advantages of the technical solution of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present invention.

[0028] Example 1: Please refer to Figures 1 to 8 As shown:

[0029] The present invention provides a downhole equipment maintenance tool, comprising a side column 1; a wellhead support rod 2 is fixedly connected to the top of the two side columns 1 by welding, and the side column 1 is used to support the No. 1 cross bar 3 on the inner side of the maintenance ladder. When using this device to go down the well for maintenance, the main body of the ladder can be put into the well first, and then the wellhead support rod 2 will be stuck on the well edge, and then the maintenance personnel can climb down into the well along the ladder; five support blocks 4 are fixedly provided on one side of the two side columns 1, and a No. 1 cross bar support rod 5 is slidably installed on the support blocks 4 on one side of the two side columns 1, and the support blocks 4 are used to slidably support the No. 1 cross bar support rod 5, so that the No. 1 cross bar 3 between the No. 1 cross bar support rods 5 can be slidably supported. When the maintenance personnel step on the No. When the ladder is lifted up, the first step is to lift the ladder and the second step is to lift the ladder up, so that the ladder can be lifted up and the ladder will be lifted up, and the ladder will be able to move freely. When the ladder is lifted up, the bottom end of the ladder will be located in the round holes on the left and right sides of the bottom of the wellhead support rod 2. When the No. 1 crossbar 3 and the anti-skid nail support plate 7 slide down to the bottom, the bottom ends of the anti-skid nails 8 will extend downward, and the anti-skid nail support plate 7 will slide up to the top to hide the anti-skid nails 8, so as to avoid scratching the hands when moving the ladder. When the anti-skid nail support plate 7 slides down to the bottom, the anti-skid nails 8 can be embedded in the ground to enhance the grip. A spring 6 is also provided on the top of the support block 4. The No. 1 crossbar 3 and the No. 1 crossbar support rod 5 will compress the spring 6 when they slide down. When the maintenance personnel leave the ladder, the spring 6 will push the No. 1 crossbar 3 and the No. 1 crossbar support rod 5 to slide up to the top again. At the same time, the anti-skid nail support plate 7 at the top of the No. 1 crossbar support rod 5 will also slide up to the top. The anti-skid nails 8 are also hidden in the round holes on the left and right sides of the bottom of the wellhead support rod 2, so the hands can be avoided from being scratched when moving the ladder later; an anti-skid nail support plate 7 is slidably provided on the inner side of the wellhead support rod 2, and the bottom of the anti-skid nail support plate 7 is fixedly connected to the top of the two No. 1 crossbar support rods 5, and the anti-skid nail support plate 7 is used to support the anti-skid nails 8; a plurality of anti-skid nails 8 are fixedly provided on the left and right sides of the bottom of the anti-skid nail support plate 7. When the anti-skid nail support plate 7 slides down to the bottom, it pushes the anti-skid nails 8 at its bottom through the round holes on the left and right sides of the bottom of the wellhead support rod 2 and extends downward, so that the anti-skid nails 8 can be embedded in the ground to enhance the grip, avoiding the situation where the ladder moves above due to the operating force during the maintenance process;When the maintenance personnel leaves the top of the No. 2 cross bar 10, the tension spring 13 at the top of the No. 2 cross bar 10 will pull the No. 2 cross bar 10 up again until the top of the limiting column 11 is in close contact with the bottom surface of the No. 2 cross bar 10 above, so that the maintenance personnel can climb down the well and perform maintenance. There is a 10cm high slot above the No. 2 crossbar 10. When the maintenance personnel climb down into the well, they can easily put their feet into the slot at the top of the No. 2 crossbar 10 and step on it. Two pull ropes 12 are tied to the top of each of the five No. 2 crossbars 10. When the maintenance personnel step on the top of the No. 2 crossbar 10, the No. 2 crossbar 10 will move downward due to gravity until the pull ropes 12 are fully extended. At this time, the pull ropes 12 can prevent the No. 2 crossbar 10 from falling too much. Two tension springs 13 are also fixed to the top of each of the five No. 2 crossbars 10. When the maintenance personnel leave the top of the No. 2 crossbar 10, the tension springs 13 at the top of the No. 2 crossbar 10 will pull the No. 2 crossbar 10 up again until the top of the limit column 11 is in close contact with the bottom surface of the No. 2 crossbar 10 above. This can automatically shorten the overall length of the ladder, making it more convenient to move the ladder later and saving more space when putting the ladder into a car.

[0030] Among them, the inner side of the side column 1 is provided with a cylindrical hole with an inner diameter equal to the outer diameter of the No. 2 cross bar support rod 9, and the front and rear sides of the top of the No. 2 cross bar support rod 9 are also provided with a rectangular plate, and the front and rear outer walls of the side column 1 are provided with a vertical groove equal to the width of the front and rear rectangular plates at the top of the No. 2 cross bar support rod 9. When stepping on the top of the No. 2 cross bar 10, the No. 2 cross bar 10 and the No. 2 cross bar support rod 9 will both slide downward, and the No. 2 cross bar support rod 9 will slide down in the cylindrical hole on the inner side of the side column 1 when sliding, and the rectangular plates at the front and rear sides of the top of the No. 2 cross bar support rod 9 will also slide in the vertical grooves on the front and rear outer walls of the side column 1. At the same time, the rectangular plates at the front and rear sides of the top of the No. 2 cross bar support rod 9 and the vertical grooves on the front and rear outer walls of the side column 1 can also play a limiting role to prevent the No. 2 cross bar support rod 9 from falling off from the side column 1.

[0031] Among them, a circular plate is provided on both sides of the left and right sides of the No. 2 crossbar 10, the bottom No. 2 crossbar 10 is fixedly connected to the bottom ends of the two No. 2 crossbar support rods 9, and the circular plates on the left and right sides of the four No. 2 crossbars 10 above are provided with a circular hole with an inner diameter equal to the outer diameter of the No. 2 crossbar support rod 9. The top ends of the pull ropes 12 and tension springs 13 at the top of the four No. 2 crossbars 10 below are fixedly connected to the bottom of the No. 2 crossbar 10 above them, and the top ends of the pull ropes 12 and tension springs 13 at the top of the No. 2 crossbar 10 above them are fixedly connected to the bottom of the No. 1 crossbar 3 at the bottom, so the bottom When the second cross bar 10 moves downward, the second cross bar support rod 9 can slide downward relative to the upper second cross bar 10, thereby cooperating with the lower cross bar 10 to slide down, and after the pull rope 12 is unfolded, the second cross bar 10 can be prevented from falling too much. When the maintenance personnel leave the top of the second cross bar 10, the tension spring 13 at the top of the second cross bar 10 will pull the second cross bar 10 up again until the top of the limit column 11 is in close contact with the bottom surface of the upper second cross bar 10, thereby automatically shortening the overall length of the ladder, making it more convenient to move the ladder later and saving more space when putting the ladder into the car.

[0032] Among them, cross bar No. 1 3 is located above the five groups of support blocks 4 respectively, and the bottom ends of the springs 6 are tightly attached to the top surfaces of the support blocks 4, and the top ends of the springs 6 are tightly attached to the bottom surfaces of the cross bar No. 1 3. Cross bar No. 1 3 and cross bar support rod No. 1 5 will compress the spring 6 when sliding down, and when the maintenance personnel leave the ladder, the spring 6 will push cross bar No. 1 3 and cross bar support rod No. 1 to slide upward to the top again. At the same time, the anti-slip support plate 7 at the top of the cross bar support rod No. 1 5 will also slide up to the top, and the anti-slip nails 8 will also be hidden in the round holes on the left and right sides of the bottom of the wellhead support rod 2, so that hands can be avoided from being scratched when moving the ladder later.

[0033] Among them, the height of the limit column 11 is 10 cm, and the length of the pull rope 12 is 30 cm. Therefore, after the No. 2 cross bar 10 is retracted upward, the height of the empty groove at the top of the No. 2 cross bar 10 is 10 cm. When the maintenance personnel climb down into the well, they can easily put their feet into the empty groove at the top of the No. 2 cross bar 10 and step on it. When the No. 2 top bar 10 slides to the bottom, the pull rope 12 will unfold. At this time, the upper and lower spacing of the No. 2 cross bar 10 will also be 30 cm, which can effectively extend the ladder as a whole.

[0034] Among them, a rectangular cavity is provided on the inner side of the wellhead support rod 2, and the anti-slip nail support plate 7 can slide up and down in this rectangular cavity. A number of circular holes are provided on the left and right sides of the bottom of the wellhead support rod 2, and the outer diameter of the anti-slip nail 8 is equal to the inner diameter of these circular holes. When the maintenance personnel step on the top of the No. 1 cross bar 3, the No. 1 cross bar 3 and the No. 1 cross bar support rod 5 will slide downward due to gravity under the support of the support block 4, and when the No. 1 cross bar support rod 5 slides down, it can drive the anti-slip nail support plate 7 at its top to slide downward synchronously. At this time, the anti-slip nail support plate 7 will push the anti-slip nail 8 at its bottom to pass through the circular holes on the left and right sides of the bottom of the wellhead support rod 2 and extend downward, so that the anti-slip nail 8 can be embedded in the ground to enhance the grip, thereby avoiding the situation where the ladder moves above due to the operating force during the maintenance process.

[0035] Example 2: Please refer to Figures 1 to 8 As shown:

[0036] A rectangular plate structure is provided on the front and rear sides of the side column 1 close to the No. 1 cross bar 3, and one side of these two rectangular plate structures is tightly attached to the front and rear outer walls of the No. 1 cross bar 3 respectively, so as to prevent the No. 1 cross bar 3 from moving forward and backward, thereby ensuring that the No. 1 cross bar 3 can move up and down stably, and effectively prevent the No. 1 cross bar 3 from falling off from the main part of the ladder, thereby ensuring stability and safety in use.

[0037] The specific usage and function of this embodiment: In the present invention, when using this device to go down the well for maintenance, the main body of the ladder can be placed into the well first, and then the wellhead support rod 2 will be stuck on the well edge, and then the maintenance personnel can climb down into the well along the ladder. When the maintenance personnel step on the top of the No. 1 crossbar 3, the No. 1 crossbar 3 and the No. 1 crossbar support rod 5 will slide downward under the support of the support block 4 due to gravity, and when the No. 1 crossbar support rod 5 slides down, it can drive the anti-skid nail support plate 7 at its top to slide downward synchronously. At this time, the anti-skid nail support plate 7 will push the anti-skid nail 8 at its bottom to pass through the circular holes on the left and right sides of the bottom of the wellhead support rod 2 and extend downward, so that the anti-skid nail The sliding nails 8 are embedded in the ground to enhance the grip, so as to avoid the situation where the ladder moves above due to the force exerted by the maintenance personnel during the maintenance process. When the maintenance personnel step on the top of the No. 2 cross bar 10, the No. 2 cross bar 10 and the No. 2 cross bar support rod 9 will slide downwards. When the No. 2 cross bar support rod 9 slides, it will slide down in the cylindrical hole on the inner side of the side column 1 until the pull rope 12 is fully unfolded. In this way, the ladder can be extended as a whole, making it convenient for maintenance personnel to enter the deep well to repair the power equipment. In addition, the rectangular plates on the front and rear sides of the top of the No. 2 cross bar support rod 9 will also slide in the vertical grooves on the front and rear outer walls of the side column 1. At the same time, the rectangular plates on the front and rear sides of the top of the No. 2 cross bar support rod 9 and The vertical grooves on the front and rear outer walls of the side column 1 can also play a limiting role to prevent the No. 2 crossbar support rod 9 from falling off the side column 1. When the maintenance personnel leave the top of the No. 2 crossbar 10, the tension spring 13 on the top of the No. 2 crossbar 10 will pull the No. 2 crossbar 10 to move up again until the top of the limiting column 11 is in close contact with the bottom surface of the No. 2 crossbar 10 above. In this way, there is a 10 cm high empty groove above the No. 2 crossbar 10. When the maintenance personnel climb down into the well, they can easily put their feet into the empty groove at the top of the No. 2 crossbar 10 and step on it. At the same time, the tension spring 13 on the top of the No. 2 crossbar 10 will also pull the No. 2 crossbar 10 to move up again until the limiting column 11 is in close contact with the bottom surface of the No. 2 crossbar 10 above. The top of the column 11 is in close contact with the bottom surface of the second cross bar 10 above, thereby automatically shortening the overall length of the ladder, making it more convenient to move the ladder later, and saving more space when putting the ladder into the car. The No. 1 cross bar 3 and the No. 1 cross bar support rod 5 will compress the spring 6 when they slide down. When the maintenance personnel leave the ladder, the spring 6 will push the No. 1 cross bar 3 and the No. 1 cross bar support rod 5 to slide upward to the top again. At the same time, the anti-slip support plate 7 at the top of the No. 1 cross bar support rod 5 will also slide up to the top, and the anti-slip nails 8 will also be hidden in the round holes on the left and right sides of the bottom of the wellhead support rod 2, so that hands can be avoided from being scratched when moving the ladder later.

Claims

1. A downhole equipment maintenance tool, comprising: Side column (1); the top ends of the two side columns (1) are fixedly connected to a wellhead support rod (2) by welding; it is characterized in that five support blocks (4) are fixedly provided on one side of the two side columns (1), and a No. 1 crossbar support rod (5) is slidably installed on the support blocks (4) on one side of the two side columns (1); a total of five No. 1 crossbars (3) are fixedly provided between the two No. 1 crossbar support rods (5); a spring (6) is also provided on the top of each support block (4); an anti-slip nail support plate (7) is slidably provided on the inner side of the wellhead support rod (2), and the bottom of the anti-slip nail support plate (7) is in contact with the two The top of the first cross bar support rod (5) is fixedly connected; a plurality of anti-slip nails (8) are fixedly provided on the left and right sides of the bottom of the anti-slip nail support plate (7); a second cross bar support rod (9) is slidably embedded in the inner side of the two side columns (1); a total of five second cross bars (10) are installed between the two second cross bar support rods (9); two limit columns (11) are fixedly and symmetrically provided on the tops of the four second cross bars (10) at the bottom; two pull ropes (12) are tied to the tops of the five second cross bars (10); and two tension springs (13) are also fixedly provided on the tops of the five second cross bars (10).

2. A downhole equipment maintenance tool according to claim 1, characterized in that: The first crossbar (3) is respectively located above the five groups of support blocks (4), and the bottom ends of the springs (6) are in close contact with the top surfaces of the support blocks (4), and the top ends of the springs (6) are in close contact with the bottom surface of the first crossbar (3).

3. A downhole equipment maintenance tool according to claim 1, characterized in that: A rectangular cavity is provided on the inner side of the wellhead support rod (2), and the anti-slip spike support plate (7) can slide up and down in the rectangular cavity. A plurality of circular holes are provided on both the left and right sides of the bottom of the wellhead support rod (2), and the outer diameter of the anti-slip spike (8) is equal to the inner diameter of these circular holes.

4. A downhole equipment maintenance tool according to claim 1, characterized in that: When the No. 1 cross bar (3) and the anti-skid nail support plate (7) slide up to the top, the bottom ends of the anti-skid nails (8) will be located in the circular holes on the left and right sides of the bottom of the wellhead support bar (2); when the No. 1 cross bar (3) and the anti-skid nail support plate (7) slide down to the bottom, the bottom ends of the anti-skid nails (8) will extend downward.

5. A downhole equipment maintenance tool according to claim 1, characterized in that: The inner side of each side column (1) is provided with a cylindrical hole having an inner diameter equal to the outer diameter of the second crossbar support rod (9), the front and rear sides of the top of the second crossbar support rod (9) are further provided with a rectangular plate, and the front and rear outer walls of each side column (1) are provided with a vertical groove having a width equal to the front and rear rectangular plates of the top of the second crossbar support rod (9).

6. A downhole equipment maintenance tool according to claim 1, characterized in that: A circular plate is provided on both sides of the second cross bar (10); the bottom second cross bar (10) is fixedly connected to the bottom ends of the two second cross bar support rods (9); the circular plates on the left and right sides of the four second cross bars (10) above are each provided with a circular hole with an inner diameter equal to the outer diameter of the second cross bar support rod (9); the top ends of the pull ropes (12) and tension springs (13) at the tops of the four second cross bars (10) below are fixedly connected to the bottom ends of the second cross bars (10) above them; the top ends of the pull ropes (12) and tension springs (13) at the top of the top second cross bar (10) are fixedly connected to the bottom ends of the bottom first cross bar (3).

7. A downhole equipment maintenance tool according to claim 1, characterized in that: The height of the limiting column (11) is 10 cm, and the length of the pull rope (12) is 30 cm.

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