A gate opening measuring device

Abstract

The utility model discloses a gate opening degree measuring device belongs to gate opening degree measurement technical field. Including the opening degree ruler and the traction rope for measuring the gate opening degree, the opening degree ruler is provided with a plurality of, and a plurality of opening degree rulers cooperate each other for showing the gate opening degree, one end of the traction rope is connected with the gate, and the other end of the traction rope is connected with the counterweight alternately around the opening degree ruler, and the pointer matched with the opening degree ruler is arranged on the traction rope, the opening degree ruler is provided with three and vertically distributes along the horizontal direction, is opening degree ruler one, opening degree ruler two and opening degree ruler three respectively, and the maximum value of preceding opening degree ruler is the starting value of following opening degree ruler, the starting value of opening degree ruler one or opening degree ruler four is zero opening degree, and the pointer points to zero opening degree at the beginning. The utility model can improve the applicability on the basis of accurate display gate opening degree, and solves the problem that the gate with too high lift is inconvenient to observe the gate opening degree in the machine room.

Description

Technical Field

[0001] This utility model belongs to the field of gate opening measurement technology, specifically relating to a gate opening measurement device. Background Technology

[0002] Gates are installed on the openings of structures such as spillways, spillways, hydraulic tunnels, and sluices to regulate flow, control upstream and downstream water levels, discharge floodwaters, and remove silt or floating debris. They are an important component of hydraulic structures. To optimize water resource utilization efficiency and ensure the safe and stable operation of water conservancy projects, workers usually need to precisely control the gate opening. Gate opening refers to the degree to which the gate is opened, and it is used to measure the gate's ability to regulate water flow. Specifically, by adjusting the degree of gate opening, the flow rate and velocity of water are controlled, thereby achieving accurate allocation of water resources, effective control of river water levels, and reduction of water waste.

[0003] Gates can be categorized into flat gates, curved gates, miter gates, and sector gates. For flat gates, the gate opening degree refers to its opening height. Measuring the gate opening degree can detect the gate's operational stability, reliability, and anti-interference capability, directly affecting the safe operation of the gate and its hoist. However, existing machine rooms have limited height, making it inconvenient to observe the gate opening degree for some gates with excessively high lifting heads. Therefore, a gate opening degree measuring device is urgently needed. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a gate opening measurement device that can improve applicability while accurately displaying the gate opening and solve the problem that it is inconvenient to observe the gate opening in the machine room for gates with excessively high head.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a gate opening measuring device, comprising an opening gauge and a traction rope for measuring the gate opening, wherein multiple opening gauges are provided, and the multiple opening gauges cooperate with each other to display the gate opening, one end of the traction rope is connected to the gate, and the other end of the traction rope alternately passes around the opening gauge and is connected to a counterweight, and a pointer matching the opening gauge is provided on the traction rope.

[0006] Optionally, three opening gauges are provided and vertically distributed along the horizontal direction, namely opening gauge one, opening gauge two, and opening gauge three, and the maximum value of the former opening gauge is the starting value of the latter opening gauge, and the pointers are corresponding to pointer one, pointer two, and pointer three.

[0007] Optionally, three opening rulers are provided and horizontally distributed along the vertical direction, namely opening ruler four, opening ruler five and opening ruler six, and the maximum value of the former opening ruler is the starting value of the latter opening ruler, and the pointers are corresponding to pointer four, pointer five and pointer six.

[0008] Optionally, a pulley device is provided on the outside of the opening gauge, and the traction rope alternately passes around the opening gauge through the pulley device.

[0009] Optionally, the opening gauge and the pulley device are installed on the inner wall of the machine room.

[0010] Optionally, the gate is provided with a lifting ring, and the traction rope is connected to the gate through the lifting ring.

[0011] Optionally, a platform is provided at the bottom of the machine room, and the platform is provided with opening one and opening two for the traction rope to pass through. The traction rope passes through opening one and is connected to the lifting ring, and the counterweight passes through opening two and hangs vertically.

[0012] Optionally, the initial value of the opening ruler is zero opening, the pointer one initially points to the zero opening, the pointer two points to the initial value of the opening ruler, the pointer one is not within the effective measurement area, and the pointer three points to the initial value of the opening ruler, the pointer two is not within the effective measurement area.

[0013] Optionally, the initial value of the opening ruler four is zero opening, the pointer four initially points to the zero opening, the pointer five points to the initial value of the opening ruler five, the pointer four is not within the effective measurement area, and the pointer six points to the initial value of the opening ruler six, the pointer five is not within the effective measurement area.

[0014] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: (1) In this utility model, by setting a traction rope to connect with the gate and setting an opening scale, the traction rope passes around the opening scale and connects to the counterweight, which can transmit the movement of the gate lifting and lowering to the counterweight and drive the pointer on the traction rope to move. The pointer matches the opening scale, and the opening degree of the gate is displayed in real time and accurately. Moreover, there are multiple opening scales. The traction rope passes around the opening scale alternately and connects to the counterweight, which can display the gate opening degree by coordinating them. According to different usage scenarios, the appropriate number of opening scales can be selected, which improves the applicability of the device and solves the problem that it is not convenient to observe the gate opening degree in the machine room when the gate with too high a head is too high. (2) In this utility model, by setting multiple opening gauges vertically distributed along the horizontal direction, space in the height direction of the machine room can be saved. For some machine rooms with smaller height, it is convenient to observe the gate opening. (3) In this utility model, by setting multiple opening gauges to be distributed horizontally in the opposite direction of the vertical direction, space in the width direction of the machine room can be saved. For some machine rooms with a smaller width direction, it is convenient to observe the gate opening. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a cross-sectional view of a preferred embodiment of the gate opening measuring device of this utility model; Figure 2 This is a schematic diagram of the gate opening measurement device of this utility model when the gate is at zero opening in Embodiment 1; Figure 3 yes Figure 2 Enlarged view of point A in the sectional view shown; Figure 4 This is a schematic diagram of the gate opening measuring device of this utility model when the gate is in the middle stroke. Figure 5 yes Figure 4 Enlarged view of point B in the sectional view shown; Figure 6 This is a schematic diagram of the gate opening measuring device of this utility model when the gate is in the high stroke position; Figure 7 yes Figure 6 Enlarged view of point C in the sectional view shown; Figure 8 This is a schematic diagram of the structure of the gate opening measuring device of this utility model, in embodiment two, where the opening gauge is distributed along the vertical direction.

[0017] Among them, 1. hoist; 101. gate; 111. lifting ring; 2. Scale ruler; 201. Scale ruler one; 202. Scale ruler two; 203. Scale ruler three; 204. Scale ruler four; 205. Scale ruler five; 206. Scale ruler six; 3. Tow rope; 301. Pointer; 311. Pointer one; 312. Pointer two; 313. Pointer three; 314. Pointer four; 315. Pointer five; 316. Pointer six; 4. Counterweight; 5. Computer room; 501. Platform; 511. Opening 1; 512. Opening 2; 6. Pulley system. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0019] It should be noted that if directional indicators (such as up, down, bottom, top, etc.) are involved in this embodiment, these directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. Example 1

[0020] like Figure 1 As shown, a gate opening measurement device includes a hoist 1, a gate 101 connected to the hoist 1, and a machine room 5 located outside the hoist 1. Since the height of the machine room 5 is limited in some locations, it is not convenient to observe the gate opening of some gates 101 with excessively high lifting head. Therefore, this embodiment improves upon this problem.

[0021] Specifically, such as Figure 2 As shown, multiple opening gauges 2 are installed horizontally along the inner wall of the machine room 5. The opening gauges 2 are vertically positioned, with the maximum value of the preceding opening gauge 2 being the starting value of the following opening gauge 2. These opening gauges 2 work together to display the gate opening. A platform 501 is installed at the bottom of the machine room 5. The platform 501 has opening 1 511 and opening 2 512. A lifting ring 111 is installed on the gate 101, and one end of a traction rope 3 is fixedly connected to it. The other end of the traction rope 3 passes through opening 1 511 and alternately passes around the opening gauges 2 and the corresponding opening gauges via a pulley device 6 installed on the inner wall of the machine room 5. The counterweight 4 is connected and can hang vertically through the second opening 512. The traction rope 3 is equipped with a pointer 301 that matches the opening scale 2. The opening degree of the gate can be accurately displayed in real time by matching the pointer with the opening scale. The horizontal direction is the direction from the second opening 512 to the first opening 511. The counterweight 4 can hang vertically because it can hang naturally by its own weight. The opening scale 2 is equipped with a column of scales. One side of the scale is the gate opening degree and the other side is the gate bottom elevation. The pointer 301 can point to the scale to accurately indicate the gate opening degree and the gate bottom elevation.

[0022] Preferably, such as Figure 5As shown, three opening gauges 2 are provided and vertically distributed along the horizontal direction, namely opening gauge one 201, opening gauge two 202, and opening gauge three 203. The initial value of opening gauge one 201 is zero opening, the maximum value of opening gauge one 201 is the initial value of opening gauge two 202, and the maximum value of opening gauge two 202 is the initial value of opening gauge three 203. Pointers one 311, two 312, and three 313 are spaced apart on the traction rope 3. Pointer one 311 matches opening gauge one 201, and pointer three 313... Pointer 312 matches with opening ruler 202, and pointer 313 matches with opening ruler 303; the pulley device 6 includes a first pulley group, a second pulley, a third pulley group, a fourth pulley group, and a fifth pulley group, wherein: the first pulley group, the third pulley group, the fourth pulley group, and the fifth pulley group all include a first pulley and a tail pulley. Specifically, the first pulley group is set on the inner wall of the top of the machine room 5, the first pulley in the first pulley group is located above opening 511, the tail pulley in the first pulley group is located above the second pulley, and the second pulley is set on the opening ruler. The third pulley group is located below the starting end of the third pulley group (203). The first and last pulleys of the third pulley group are located above the maximum value end of the third pulley group (203). The first pulley of the third pulley group is located above the position where the second pulley and the third pulley group are vertically tangent on the opposite side of the third pulley group (203). The fourth pulley group is located below the maximum value end of the second pulley group (202). The first and last pulleys of the fourth pulley group are located below the maximum value end of the second pulley group (202). The third... The first pulley of the fourth pulley group is located below the position where the tail pulley of the pulley group is vertically tangent to the side opposite to the opening ruler 203. The fifth pulley group is located above the maximum value end of the opening ruler 201. The first pulley and the tail pulley of the fifth pulley group are located above the side of the maximum value end of the opening ruler 201. The tail pulley of the fourth pulley group is located below the position where the first pulley of the fifth pulley group is vertically tangent to the side opposite to the opening ruler 201, and the tail pulley of the fifth pulley group is located directly above the opening 512.

[0023] Specifically, such as Figure 7As shown, the first pulley, tail pulley, and second pulley are all fixed pulleys with an annular groove in the middle. The traction rope 3 is located in the annular groove. The traction rope 3 passes through the first pulley group, the second pulley, the third pulley group, the fourth pulley group, and the fifth pulley group. That is, the movement path of the traction rope 3 alternately passes through the opening ruler 1 201, the opening ruler 2 202, and the opening ruler 3 203. The traction rope 3 passes through the first pulley group and the second pulley and is located below the starting value end of the opening ruler 3 203. Then, it passes through the third pulley group, the fourth pulley group, and the fifth pulley group and is located above the maximum value end of the opening ruler 3 203, below the maximum value end of the opening ruler 2 202, and above the maximum value end of the opening ruler 1 201 in sequence. Then, the traction rope 3 continues to extend along the opening ruler 1 201 from the maximum value end to the starting value end of the opening ruler 1 201 and connects with the counterweight 4.

[0024] Specifically, when the gate is not open, pointer 311 is located to the left of opening scale 201 and points to the initial value of opening scale 201, which is zero opening. As the gate slowly opens and rises, pointer 311 is also pulled by traction rope 3 along opening scale 201. The opening indicated by pointer 311 slowly increases from the initial value of opening scale 201 to the maximum value of opening scale 201. At this time, pointer 312 is located to the left of opening scale 202 and points to the initial value of opening scale 202. As the gate continues to rise, pointers 311 and 312 move towards each other. Both 12 move with the traction rope 3. At this time, pointer 311 is not within the effective measurement area, which refers to the area to the left of the opening scale 201. When pointer 311 is to the left of the opening scale 201, the opening value indicated by pointer 311 on the opening scale 201 is a valid value. When pointer 311 is not to the left of the opening scale 201, the opening value indicated by pointer 311 on the opening scale 201 is an invalid value. The gate then rises, and the opening value indicated by pointer 312 slowly increases from the initial value of the opening scale 202 to the opening value of the opening scale 202. When the gate reaches its maximum value of 2, pointer 313 is located to the left of opening scale 3203 and points to the initial value of opening scale 3203. As the gate continues to rise, pointers 212 and 313 both move with the traction rope 3. At this time, pointer 212 is not within the effective measurement area, which refers to the area to the left of opening scale 202. When pointer 212 is to the left of opening scale 202, pointer 212 points to the effective value of the opening on opening scale 202. When pointer 212 is not to the left of opening scale 202, pointer 212 points to the effective value of the opening on opening scale 202. The opening value on the opening scale 202 is not an effective value; when pointer 1 311 is within the effective measurement area, the opening value on the opening scale 201 pointed to by pointer 1 311 is the real-time opening value during the gate opening process. Only when pointer 1 311 is not within the effective measurement area, the opening value on the opening scale 202 pointed to by pointer 2 312 is the real-time opening value during the gate opening process. When both pointer 1 311 and pointer 2 311 are not within the effective measurement area, the opening value on the opening scale 3 203 pointed to by pointer 3 313 is the real-time opening value during the gate opening process.

[0025] Preferably, the pointer 301 can be made of thermoplastic polyurethane elastomer, thermoplastic vulcanized rubber, spring steel or shape memory alloy.

[0026] Specifically, when the pointer 301 moves with the traction rope 3 around the pulley device 6, it can be squeezed by the fixed pulley and then rebound to match the opening scale 2, so as to display the opening degree of the gate in real time and accurately.

[0027] Preferred, such as Figure 4As shown, an opening three is provided on the gate chamber and directly below the second opening 512. This ensures that when the gate 101 has too high a lift, the counterweight 4 can hang vertically stably, thus ensuring the accuracy of the gate opening measurement. Example 2

[0028] Based on Embodiment 1, this embodiment provides a gate opening measurement device. This embodiment is an optimization based on Embodiment 1 to refine the technical solution. For details not described in this embodiment, please refer to Embodiment 1. This embodiment specifically introduces another arrangement of the opening gauge 2.

[0029] Specifically, such as Figure 8 As shown, three opening gauges 2 are horizontally arranged in the vertical direction: opening gauge four 204, opening gauge five 205, and opening gauge six 206. The initial value of opening gauge four 204 is zero opening, the maximum value of opening gauge four 204 is the initial value of opening gauge five 205, and the maximum value of opening gauge five 205 is the initial value of opening gauge six 206. Pointers four 314, five 315, and six 316 are spaced apart on the traction rope 3, wherein pointer four 314 matches opening gauge four 204. Pointer 5 315 matches with opening scale 5 205, and pointer 6 316 matches with opening scale 6 206; the pulley device 6 includes a sixth pulley group, a seventh pulley group, an eighth pulley group, and a ninth pulley, wherein: the sixth pulley group, the seventh pulley group, and the eighth pulley group each include a first pulley and a tail pulley. Specifically, the ninth pulley and the seventh pulley group are located above opening 1 511, the sixth pulley group and the eighth pulley group are located directly above opening 2 512, and the ninth pulley is set above the starting value end side of opening scale 6 206. The pulley system is located above the maximum value end of the opening size 206 (6mm x 6). The first and last pulleys of the sixth pulley system are located above and below the maximum value end of the opening size 206 (6mm x 6), respectively. The first pulley in the sixth pulley system is flush with the ninth pulley, and the line connecting the first and ninth pulleys is parallel to the extension direction of the opening size 206 (6mm x 6). The seventh pulley system is located to one side of the maximum value end of the opening size 205 (5mm x 5), and the first and last pulleys of the seventh pulley system are located to the side of the maximum value end of the opening size 205 (5mm x 5). Above and below the side, the tail pulley of the sixth pulley group is arranged in the horizontally tangential extension direction of the first pulley of the seventh pulley group opposite to the side of the opening ruler 5 205. The eighth pulley group is arranged on the side of the maximum value end of the opening ruler 4 204. The first pulley and the tail pulley of the eighth pulley group are respectively located above and below the maximum value end of the opening ruler 1 201. The tail pulley of the seventh pulley group is arranged in the horizontally tangential extension direction of the first pulley of the eighth pulley group opposite to the side of the opening ruler 1 201.

[0030] Specifically, such as Figure 8As shown, the first pulley, the tail pulley, and the ninth pulley are all fixed pulleys with an annular groove in the middle. The traction rope 3 is located in the annular groove. The traction rope 3 passes around the ninth pulley, the sixth pulley group, the seventh pulley group, and the eighth pulley group. That is, the movement path of the traction rope 3 alternately passes around the opening ruler 4 204, the opening ruler 5 205, and the opening ruler 6 206. The traction rope 3 passes around the ninth pulley and is located above the starting value end of the opening ruler 6 206. Then, it passes through the sixth pulley group, the seventh pulley group, and the eighth pulley group and is located on one side of the maximum value end of the opening ruler 6 206, one side of the maximum value end of the opening ruler 5 205, and one side of the maximum value end of the opening ruler 4 204, respectively. Then, the traction rope 3 is connected to the counterweight 4, and the counterweight 4 hangs vertically as it passes through the opening 2 512.

[0031] Specifically, such as Figure 8As shown, when the gate is not open, pointer 4 314 is above the opening scale 4 204 and points to the initial value of the opening scale 4 204, which is zero opening. As the gate slowly opens and rises, pointer 4 314 is also pulled by the traction rope 3 along the opening scale 4 204. The opening indicated by pointer 4 314 slowly increases from the initial value of the opening scale 4 204 to the maximum value of the opening scale 4 204. At this time, pointer 5 315 is above the opening scale 5 205 and points to the initial value of the opening scale 5 205. As the gate continues to rise, pointer 4 314 and pointer 5 315 move together. All 15 move with the traction rope 3. At this time, pointer 4 314 is not within the effective measurement area, which refers to the area above the opening scale 4 204. When pointer 4 314 is above the opening scale 4 204, the opening value pointed to by pointer 4 314 on the opening scale 4 204 is a valid value. When pointer 4 314 is not above the opening scale 4 204, the opening value pointed to by pointer 4 314 on the opening scale 4 204 is an invalid value. The gate then rises, and the opening value pointed to by pointer 5 315 slowly increases from the initial value of opening scale 5 205 to opening scale 5 20. When the gate reaches its maximum value of 5, pointer 316 is located to the left of opening scale 206 and points to the initial value of opening scale 206. As the gate continues to rise, pointers 315 and 316 both move with the traction rope 3. At this time, pointer 315 is not within the effective measurement area, which refers to the area to the left of opening scale 205. When pointer 315 is to the left of opening scale 205, the opening value indicated by pointer 315 is the valid value. When pointer 315 is not to the left of opening scale 205, the opening value indicated by pointer 315 is the valid value. The opening value on the opening scale 205 is not a valid value; when the pointer 314 is within the valid measurement area, the opening value on the opening scale 204 pointed to by the pointer 314 is the real-time opening value during the gate opening process. Only when the pointer 314 is not within the valid measurement area, the opening value on the opening scale 205 pointed to by the pointer 315 is the real-time opening value during the gate opening process. When neither the pointer 314 nor the pointer 315 is within the valid measurement area, the opening value on the opening scale 206 pointed to by the pointer 316 is the real-time opening value during the gate opening process.

[0032] Working principle: In different gate opening measurement environments, select an appropriate number of opening gauges 2 according to requirements and environmental characteristics, and install the pulley device 6 and the opening gauges 2 in suitable positions. The traction rope 3 is alternately routed around the opening gauges 2 via the pulley device 6 and connected to the counterweight 4. Figure 2 As shown, when gate 101 is fully closed, as Figure 3 and Figure 8As shown, pointer 311 should point to the zero opening on opening scale 201, or pointer 314 should point to the zero opening on opening scale 204. As the gate 101 opens and rises, and the counterweight 4 descends, pointer 311 rises along opening scale 201 until it points to the maximum value on opening scale 201. Then, pointer 312 points to the initial value on opening scale 202. Figure 4 As shown, when the gate 101 continues to rise and the counterweight 4 continues to fall, the pointer 311 moves along with the traction rope 3 past the fifth pulley block, continuing to move towards the starting value end of the opening scale 201. Figure 5 As shown, at this time, the opening value pointed to by pointer 311 is invalid. Attention should be paid to the scale pointed to by pointer 312. Simultaneously, pointer 312 moves along the opening scale 202 until it reaches its maximum value. Then, pointer 313 points to the starting value of the opening scale 203. Figure 6 As shown, as the gate 101 continues to rise and the counterweight 4 continues to fall, pointer 313 moves along the opening scale 203, as... Figure 7 As shown, at this time, pointer 2 312 passes around the fourth pulley group with the traction rope 3, and the opening value pointed to by pointer 2 312 is invalid. At this time, we only need to pay attention to the opening value pointed to by pointer 3 313 on the opening scale 3 203 until the gate 101 stops rising and the counterweight 4 stops falling. The opening value pointed to by pointer 3 313 on the opening scale 3 203 is the opening value of the gate 101 in the open state at this time.

[0033] Based on the preferred embodiments of this utility model described above, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A gate opening measurement device, characterized in that: It includes an opening gauge (2) for measuring the gate opening degree and a traction rope (3). Multiple opening gauges (2) are provided, and multiple opening gauges (2) cooperate with each other to display the gate opening degree. One end of the traction rope (3) is connected to the gate (101), and the other end of the traction rope (3) alternately passes around the opening gauge (2) and is connected to the counterweight (4). The traction rope (3) is provided with a pointer (301) that matches the opening gauge (2).

2. The gate opening measuring device according to claim 1, characterized in that: The opening ruler (2) is provided in three vertically distributed along the horizontal direction, namely opening ruler one (201), opening ruler two (202) and opening ruler three (203), and the maximum value of the previous opening ruler (2) is the starting value of the next opening ruler (2). The pointer (301) corresponds to pointer one (311), pointer two (312) and pointer three (313).

3. The gate opening measuring device according to claim 1, characterized in that: The opening ruler (2) is provided in three parts and is horizontally distributed along the vertical direction. They are opening ruler four (204), opening ruler five (205) and opening ruler six (206). The maximum value of the previous opening ruler (2) is the starting value of the next opening ruler (2). The pointer (301) corresponds to pointer four (314), pointer five (315) and pointer six (316).

4. The gate opening measuring device according to claim 2 or 3, characterized in that: A pulley device (6) is provided on the outside of the opening ruler (2), and the traction rope (3) alternately passes around the opening ruler (2) through the pulley device (6).

5. The gate opening measuring device according to claim 4, characterized in that: The opening ruler (2) and the pulley device (6) are installed on the inner wall of the machine room (5).

6. The gate opening measuring device according to claim 5, characterized in that: The gate (101) is provided with a lifting ring (111), and the traction rope (3) is connected to the gate (101) through the lifting ring (111).

7. The gate opening measuring device according to claim 6, characterized in that: The bottom of the machine room (5) is provided with a platform (501). The platform (501) is provided with an opening (511) and an opening (512) for the traction rope (3) to pass through. The traction rope (3) passes through the opening (511) and is connected to the lifting ring (111). The counterweight (4) passes through the opening (512) and hangs vertically.

8. The gate opening measuring device according to claim 2, characterized in that: The initial value of the opening ruler one (201) is zero opening. The pointer one (311) initially points to the zero opening. When the pointer two (312) points to the initial value of the opening ruler two (202), the pointer one (311) is not in the effective measurement area. When the pointer three (313) points to the initial value of the opening ruler three (203), the pointer two (312) is not in the effective measurement area.

9. The gate opening measuring device according to claim 3, characterized in that: The initial value of the opening ruler four (204) is zero opening. The pointer four (314) initially points to the zero opening. When the pointer five (315) points to the initial value of the opening ruler five (205), the pointer four (314) is not in the effective measurement area. When the pointer six (316) points to the initial value of the opening ruler six (206), the pointer five (315) is not in the effective measurement area.

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