Weighing device for elevator inspection

Abstract

The invention discloses a weighing device for elevator inspection, and belongs to the technical field of elevator inspection equipment.The weighing device comprises an iron sand shot storage box, a weighing box, a lifting mechanism and a weighing control system, the lifting mechanism is connected with the iron sand shot storage box and the weighing box, and the weighing control system is arranged between the bottom of the weighing box and a supporting rod; the pressure sensor detects the total mass of the weighing box and iron sand shots in the weighing box, the pressure sensor is connected with a signal detection port of the single-chip microcomputer through the signal processor, the single-chip microcomputer monitors and feeds back the total mass of the weighing box in real time through the pressure sensor, and the operation panel is connected with an input port of the single-chip microcomputer. The pressure display is connected with an output port of the single-chip microcomputer, the relay KM1 is respectively connected with the single-chip microcomputer and the motor start-stop control circuit, and the power supply supplies power to the weighing control system. According to the invention, the test result is more accurate, manual carrying is not needed, the labor cost is saved, the workload of maintenance personnel is greatly reduced, and the inspection work efficiency is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of elevator inspection equipment, and in particular relates to a weighing device for elevator inspection. Background Art

[0002] At present, my country's special equipment safety inspection and testing institutions conduct supervisory inspections and annual regular inspections on elevators in the special equipment catalog in accordance with the "Special Equipment Safety Law". The inspection items include overload protection devices, operation tests, balance coefficient tests, braking tests and other tests. Certain weight materials are required to weigh and test whether the various indicators of the elevator meet the requirements of national standards or inspection regulations.

[0003] Existing special equipment testing institutions basically use standard weights as weighing devices. Most of these standard weights weigh 20 kg / piece or 25 kg / piece. The rated load capacity of an elevator is mostly between several hundred and several thousand kilograms. When conducting tests, several elevator maintenance personnel are required to manually carry dozens of weights into the car; the weight of the weights required for each test is different, and the maintenance personnel have to move them up and down several times to meet the needs of all tests, which is time-consuming and labor-intensive; some communities have many elevators, which need to be inspected and tested one by one, which is labor-intensive and inefficient, resulting in low inspection efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a weighing device for elevator inspection, which makes the test results more accurate, does not require personnel handling, saves labor costs, greatly reduces the workload of maintenance personnel, improves inspection work efficiency, and solves the above-mentioned problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention relates to a weighing device for elevator inspection, comprising an iron sand pill storage box, a weighing box, a lifting mechanism, and a weighing control system. The iron sand pill storage box is placed outside the car or in a vehicle transporting the storage box for storing iron sand pills. The weighing box is placed in the car for loading iron sand pills. A support rod is fixed horizontally at the bottom of the weighing box. The lifting mechanism is connected to the iron sand pill storage box and the weighing box, respectively, for conveying the iron sand pills. The weighing control system is arranged between the bottom of the weighing box and the support rod. The weighing control system includes a pressure sensor, a signal processor, a single-chip microcomputer, an operation panel, a pressure display, a power supply, and a relay KM1. and a motor start-stop control circuit, the pressure sensor detects the total mass of the weighing box and the iron sand pills inside the weighing box, the pressure sensor is connected to the signal detection port of the single-chip microcomputer through the signal processor, the single-chip microcomputer monitors and feeds back the total mass of the weighing box in real time through the pressure sensor, the operation panel is connected to the input port of the single-chip microcomputer, the pressure display is connected to the output port of the single-chip microcomputer, the relay KM1 is respectively connected to the single-chip microcomputer and the motor start-stop control circuit, the power supply supplies power to the weighing control system, and the motor start-stop control circuit is used to control the start and braking of the lifting mechanism.

[0007] Furthermore, the motor start and stop control circuit includes a main circuit and a control circuit. The main circuit is a 220V AC power supply connected to the AC motor of the lifting mechanism through the weight limit switch QS, fuse FU1, and the normally open contact of relay KM; the control circuit is a 220V AC power supply connected to the coil of relay KM through fuse FU2, the normally closed contact of relay KM1, and the automatic reset switch SB, and the normally open contact of relay KM is connected in parallel with the automatic reset switch SB.

[0008] Furthermore, it also includes a weight limit switch QS, which is fixed to the car floor directly below the support rod. When the weight measured by the pressure sensor exceeds the range value or the weighing control system is damaged and the weight of the object exceeds the bearing limit of the weighing box, the support rod touches the weight limit switch QS, and the weight limit switch QS automatically disconnects the power supply of the AC motor of the lifting mechanism.

[0009] Furthermore, the lifting mechanism includes a screw conveyor, which includes a power mechanism, a shell, a screw shaft arranged inside the shell and a spiral blade installed on the screw shaft. The power structure includes an AC motor and a belt transmission mechanism. The AC motor is installed above the shell, and the output shaft of the AC motor is connected to one end of the screw shaft through the belt transmission mechanism. The feed port of the shell is connected to the iron sand pill outlet of the iron sand pill storage box through a thickened tendon pipe, and the discharge port of the shell is connected to the iron sand pill inlet of the weighing box through a thickened tendon pipe, so that the iron sand pills in the iron sand pill storage box can be transported to the weighing box.

[0010] Furthermore, the lifting mechanism also includes a support, and the shell of the screw conveyor is fixed above the support by a hinged connection. The support can adjust the inclination angle of the shell.

[0011] Furthermore, the upper part of the weighing box is square, the lower part is funnel-shaped, and an iron sand shot discharge outlet is opened at the bottom of the weighing box.

[0012] Furthermore, the weighing box is made of a transparent hard plastic material, and scale lines are marked on the wall of the weighing box.

[0013] Furthermore, the iron sand shot is spherical with a diameter of 2 mm.

[0014] Furthermore, it also includes a rubber pad with elastic deformation, and the rubber pad is arranged between the bottom of the weighing box and the support rod.

[0015] Furthermore, universal wheels are installed at the bottom of the iron sand shot storage box and the weighing box.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects:

[0017] The weighing device for elevator inspection of the present invention solves the problem that the previous elevator load test requires maintenance personnel to repeatedly carry multiple weights, which is time-consuming and labor-intensive, resulting in a long inspection time for each elevator and a great test of the maintenance personnel's physical strength. It uses iron sand balls instead of standard weights to perform load tests. The iron sand balls with a diameter of 2 mm are spherical and of appropriate size. They have not only high density but also uniform density. They are ideal weight substitutes for elevator load tests. The present invention displays the weighing weight through a pressure display. When the mass exceeds the initial set value, it can automatically stop adding load, making the test results more accurate. The operation is convenient, safe, reliable, and highly applicable. No personnel transportation is required, which saves labor costs, greatly reduces the workload of maintenance personnel, and improves inspection work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the prior art and the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 Schematic diagram of the structure of a weighing device for elevator inspection according to an embodiment of the present invention;

[0020] Figure 2 This is a circuit principle block diagram of a weighing control system in a weighing device for elevator inspection according to an embodiment of the present invention;

[0021] Figure 3 This is a circuit schematic diagram of a motor start / stop control circuit in a weighing device for elevator inspection according to an embodiment of the present invention;

[0022] Figure 4 The figure is a schematic diagram of the structure inside the casing of a screw conveyor in a weighing device for elevator inspection according to an embodiment of the present invention.

[0023] Explanation of the accompanying symbols: 1. Iron sand pills; 2. Iron sand pill storage box; 3. Weighing box; 4. Iron sand pill discharge outlet; 5. Scale line; 6. Support rod; 7. Rubber pad; 8. Pressure sensor; 9. Signal processor; 10. Single chip microcomputer; 11. Operation panel; 12. Pressure display; 13. Power supply; 14. Relay KM1; 15. Weight limit switch QS; 16. Screw conveyor; 17. AC motor; 18. Belt transmission mechanism; 19. Housing; 20. Screw shaft; 21. Spiral blade; 22. Iron sand pill outlet of the iron sand pill storage box; 23. Iron sand pill inlet of the weighing box; 24. Motor start and stop control circuit; 25. Universal wheel; 26. Support; 27. Iron sand pill inlet of the iron sand pill storage box; 28. Feed inlet of the housing; 29. ​​Discharge outlet of the housing; 30. Weighing control system. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0025] In the description of the present invention, it should be understood that the terms "length," "width," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0026] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal communication between two components or an interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0028] like Figure 1 As shown, the weighing device for elevator inspection of this embodiment includes an iron sand and shot storage box 2, a weighing box 3, a lifting mechanism and a weighing control system 30.

[0029] Among them, the iron sand pill storage box 2 is mainly used to store iron sand pills 1 during transportation. The iron sand pill storage box 2 is made of hard plastic. The iron sand pills 1 with a diameter of 2 mm are spherical, suitable in size, high in density and uniform in density, and easy to transport. They are ideal substitutes for weights in elevator load tests. An iron sand pill outlet 22 of the iron sand pill storage box is opened on the lower side of the iron sand pill storage box 2, and four universal wheels 25 are installed at the bottom of the iron sand pill storage box 2. The universal wheels 25 can not only effectively brake, but also make it easy to move the storage box body, reducing the manpower burden.

[0030] like Figure 1 and Figure 4 As shown, the lifting mechanism adopts a screw conveyor 16, which includes a power mechanism, a shell 19, a screw shaft 20 arranged inside the shell 19, and a spiral blade 21 installed on the screw shaft 20. Specifically, the power mechanism includes an AC motor 17 and a belt transmission mechanism 18. The AC motor 17 is installed above the shell 19, and the output shaft of the AC motor 17 is connected to one end of the screw shaft 20 through the belt transmission mechanism 18; the feed port 28 of the shell is connected to the iron sand shot outlet 22 of the iron sand shot storage box through a thickened tendon pipe, and the discharge port 29 of the shell is connected to the iron sand shot inlet 23 of the weighing box through a thickened tendon pipe. The thickened tendon pipe is durable and wear-resistant.

[0031] Furthermore, the lifting mechanism also includes a support 26. The housing 19 of the screw conveyor 16 is fixed to the top of the support 26 by a hinged connection. The tilt angle of the housing 19 can be adjusted as needed, thus having a wide range of applications. The rated voltage of the AC motor 17 is 220VAC, which is the household voltage for urban residents and is very convenient to find and use. When the AC motor 17 is operating, it can drive the screw shaft 20 and the spiral blades 21 to rotate together. The rotating spiral blades 21 push the iron sand pills 1 to transport the screw conveyor 16, and the iron sand pills 1 in the iron sand pill storage box 2 can be transported to the weighing box 3. The transmission flow rate is controllable and the mass loading is uniform and reliable.

[0032] The weighing box 3 is used to load the iron pellets 1. The upper portion of the weighing box 3 is square, and the lower portion is funnel-shaped. A pill outlet 4 is located at the bottom of the funnel-shaped weighing box 3 for discharging the iron pellets 1. During normal operation, the pill outlet 4 is blocked. An iron pellet inlet 23 is located on the upper side of the weighing box 3. The weighing box 3 is made of transparent hard plastic. Scale lines 5 are marked on the wall of the weighing box 3. The scale lines are marked from bottom to top, from small to large, with scales such as 630 kg, 800 kg, 1000 kg, 1050 kg, and 1600 kg, covering the rated load capacity of most elevators. If the weighing control system 30 is damaged and cannot display the load mass, the mass of the load can be calculated by adding the mass of the iron pellets 1 indicated on the scale lines 5 to the known mass of the weighing box 3. Four universal wheels 25 are mounted on the bottom of the weighing box 3 to facilitate its movement.

[0033] In addition to the above structure, a support rod 6 is fixed horizontally at the bottom of the weighing box 3. Figure 2As shown, the weighing control system 30 is arranged between the bottom of the weighing box 3 and the support rod 6. The weighing control system 30 includes a pressure sensor 8, a signal processor 9, a single-chip microcomputer 10, an operation panel 11, a pressure display 12, a power supply 13, a relay KM1 and a motor start-stop control circuit 24. The pressure sensor 8 is connected to the signal detection port of the single-chip microcomputer 10 through the signal processor 9. The single-chip microcomputer 10 monitors and feeds back the total mass of the weighing box 3 in real time through the pressure sensor 8. The operation panel 11 is connected to the input port of the single-chip microcomputer 10, and the pressure display 12 is connected to the output port of the single-chip microcomputer 10. The relay KM1 is respectively connected to the single-chip microcomputer 10 and the motor start-stop control circuit 24. The power supply 13 supplies power to the weighing control system 30. The motor start-stop control circuit 24 is used to control the starting and braking of the AC motor 17. The pressure sensor 8 has high sensitivity and high accuracy. The weighing range of the pressure sensor 8 is 1-2000KG, which can meet the test requirements of all traction-driven passenger elevators. It can detect the total mass of the weighing box 3 and the iron sand pills 1 inside the weighing box 3. The operation panel 11 can input the load value required for the elevator test, and when the total mass reaches the initially set load value required for the elevator test, the pressure sensor 8 will give a signal to the microcontroller 10, which can cut off the power supply of the AC motor 17 and stop conveying the iron sand pills 1. The pressure display 12 can accurately display the amount of mass loading and display the pressure value in real time to achieve accurate measurement of the mass loading.

[0034] When pressure sensor 8 detects a pressure change, the voltage of pressure sensor 8 changes. However, this weak voltage signal needs to be amplified by signal processor 9. The amplified signal is then sent to microcontroller 10. Microcontroller 10 outputs a signal to relay KM1, which controls the opening and closing of relay KM1's normally closed contacts to control motor start / stop control circuit 24, thereby controlling the starting and braking of 220V AC motor 17. Power supply 13 can use 5V DC.

[0035] like Figure 3As shown, the motor start / stop control circuit 24 comprises a main circuit and a control circuit. The main circuit comprises a 220V AC power supply connected to the AC motor 17 via the weight limit switch QS15, fuse FU1, and the normally open contacts of relay KM. The control circuit comprises a 220V AC power supply connected to the coil of relay KM via fuse FU2, the normally closed contacts of relay KM1, and an automatic reset switch SB. The normally open contacts of relay KM are connected in parallel with the automatic reset switch SB. When the automatic reset switch SB is pressed, it automatically opens, energizing the coil of relay KM and closing its normally open contacts, starting the AC motor 17. When the pressure sensor 8 detects that the total weight of the weighing box 3 and the iron pellets 1 has reached an initial setting, the single-chip microcomputer 10 sends a signal to relay KM1, energizing its coil. The normally closed contacts of relay KM1 open, de-energizing the coil of relay KM, and opening its normally open contacts, stopping the AC motor 17.

[0036] In this embodiment, a weight limit switch QS15 is fixed to the elevator floor directly below the support rod 6. This switch not only effectively prevents damage to the pressure sensor 8 due to a weighed weight exceeding its range, but also automatically disconnects the power supply 13 to the AC motor 17 if the weighing control system 30 fails and the weight exceeds the load capacity of the weighing box 3. When the iron sand pellets 1 become excessively heavy, the support rod 6 bends downward due to gravity as the bottom of the weighing box 3 descends. When the support rod 6 contacts the weight limit switch QS15, it opens. This switch is directly connected in series to the 220V main line of the AC motor 17, directly disconnecting the main circuit current. The support rod 6 then counteracts the weight limit switch QS15, preventing it from descending, thereby protecting the pressure sensor 8 and the weighing box 3.

[0037] In order to better protect the weighing box 3, a rubber pad 7 is inserted between the bottom of the weighing box 3 and the support rod 6. The rubber pad 7 has elastic deformation and can restore its original shape, avoiding damage to the weighing box 3 caused by long-term stress and shortening of its service life.

[0038] The working principle of the weighing device for elevator inspection in this embodiment is as follows:

[0039] When the elevator inspection needs to be tested, the weighing box 3 replacing the weights is placed in the car, the iron sand pill storage box 2 is placed outside the car or in the vehicle for transporting the storage box, and the screw conveyor 16 adjusts the inclination angle according to the iron sand pill outlet 22 of the iron sand pill storage box and the iron sand pill inlet 23 of the weighing box. When the angle is appropriate, the feed port 28 of the shell is connected to the iron sand pill outlet 22 of the iron sand pill storage box, and the discharge port 29 of the shell is connected to the iron sand pill inlet 23 of the weighing box.

[0040] After entering the desired parameter mass value on the operation panel 11, the automatic reset switch SB is pressed and automatically pops open. Since the coil of relay KM is energized, the normally open contact of relay KM closes, and the AC motor 17 starts to run. The AC motor 17 starts and drives the spiral blade 21 to rotate, transporting the iron sand pills 1 in the iron sand pill storage box 2 to the weighing box 3. The single-chip microcomputer 10 monitors and feedbacks the total mass of the weighing box 3 in real time through the pressure sensor 8. When the pressure sensor 8 detects that the mass in the weighing box 3 reaches the initial setting value, the single-chip microcomputer 10 controls the coil of relay KM1 to energize, disconnecting the normally closed contact of relay KM1, de-energizing the coil of relay KM, opening the normally open contact of relay KM, and stopping the AC motor 17. At this point, the mass in the weighing device that replaces the weight meets the requirements and can be tested.

[0041] When the weighing control system 30 fails, the weight of the object increases, the support rod 6 touches the weight limit switch QS15, the weight limit switch QS15 is disconnected, and the AC motor 17 is powered off, thereby protecting the pressure sensor 8 and the weighing box 3.

[0042] When the test is complete, adjust the angle of screw conveyor 16 so that the feed port 28 of the housing connects to the iron pellet discharge port 4 of the weighing box 3, and the discharge port 29 of the housing connects to the iron pellet inlet 27 of the iron pellet storage box. Start AC motor 17 to discharge the iron pellets 1 into the iron pellet storage box 2, and proceed to the next test.

[0043] The weighing device for elevator inspection of the present invention displays the weighing weight through a pressure display. When the weight exceeds the initial setting value, it can automatically stop adding load, making the test results more accurate. The device is easy to operate, safe and reliable, and has strong applicability. It does not require human transportation, saves labor costs, greatly reduces the workload of maintenance personnel, and improves inspection work efficiency.

[0044] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A weighing device for elevator inspection, characterized in that: It includes an iron sand pill storage box, a weighing box, a lifting mechanism and a weighing control system. The iron sand pill storage box is placed outside the car or in a vehicle transporting the storage box for storing iron sand pills. The weighing box is placed in the car for loading iron sand pills. A support rod is horizontally fixed at the bottom of the weighing box. The lifting mechanism is respectively connected to the iron sand pill storage box and the weighing box for conveying the iron sand pills. The weighing control system is arranged between the bottom of the weighing box and the support rod. The weighing control system includes a pressure sensor, a signal processor, a single-chip microcomputer, an operation panel, a pressure display, a power supply, a relay KM1 and a motor start-stop control circuit The pressure sensor detects the total mass of the weighing box and the iron sand pills inside the weighing box. The pressure sensor is connected to the signal detection port of the single-chip microcomputer through the signal processor. The single-chip microcomputer monitors and feeds back the total mass of the weighing box in real time through the pressure sensor. The operation panel is connected to the input port of the single-chip microcomputer, and the pressure display is connected to the output port of the single-chip microcomputer. The relay KM1 is respectively connected to the single-chip microcomputer and the motor start-stop control circuit. The power supply supplies power to the weighing control system, and the motor start-stop control circuit is used to control the start and braking of the lifting mechanism.

2. The weighing device for elevator inspection according to claim 1, characterized in that: The motor start and stop control circuit includes a main circuit and a control circuit. The main circuit is a 220V AC power supply that passes through a weight limit switch QS, a fuse FU1, and a normally open contact of a relay KM to connect to the AC motor of the lifting mechanism; the control circuit is a 220V AC power supply that passes through a fuse FU2, a normally closed contact of a relay KM1, and an automatic reset switch SB to connect to the coil of the relay KM, and the normally open contact of the relay KM is connected in parallel with the automatic reset switch SB.

3. The weighing device for elevator inspection according to claim 2, characterized in that: It also includes a weight limit switch QS, which is fixed to the floor of the car just below the support rod. When the weight measured by the pressure sensor exceeds the range value or the weighing control system is damaged and the weight of the object exceeds the bearing limit of the weighing box, the support rod touches the weight limit switch QS, and the weight limit switch QS automatically disconnects the power supply of the AC motor of the lifting mechanism.

4. The weighing device for elevator inspection according to claim 1, characterized in that: The lifting mechanism includes a screw conveyor, which includes a power mechanism, a shell, a screw shaft arranged inside the shell and a spiral blade installed on the screw shaft. The power structure includes an AC motor and a belt transmission mechanism. The AC motor is installed above the shell, and the output shaft of the AC motor is connected to one end of the screw shaft through the belt transmission mechanism. The feed port of the shell is connected to the iron sand pill outlet of the iron sand pill storage box through a thickened tendon pipe, and the discharge port of the shell is connected to the iron sand pill inlet of the weighing box through a thickened tendon pipe, so that the iron sand pills in the iron sand pill storage box can be transported to the weighing box.

5. The weighing device for elevator inspection according to claim 4, characterized in that: The lifting mechanism also includes a support, and the shell of the screw conveyor is fixed on the top of the support by a hinged connection. The support can adjust the inclination angle of the shell.

6. The weighing device for elevator inspection according to claim 1, characterized in that: The upper part of the weighing box is square, the lower part is funnel-shaped, and an iron sand shot discharge outlet is opened at the bottom of the weighing box.

7. The weighing device for elevator inspection according to claim 1, characterized in that: The weighing box is made of a transparent hard plastic material, and scale lines are marked on the wall of the weighing box.

8. The weighing device for elevator inspection according to claim 1, characterized in that: The iron sand shot is spherical with a diameter of 2 mm.

9. The weighing device for elevator inspection according to claim 1, characterized in that: It also includes a rubber pad with elastic deformation, and the rubber pad is arranged between the bottom of the weighing box and the support rod.

10. The weighing device for elevator inspection according to any one of claims 1 to 9, characterized in that: The bottoms of the iron sand shot storage box and the weighing box are both equipped with universal wheels.

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