Static load test device and method for hard ladder

Abstract

The invention discloses a static load test device and method for a hard ladder, the device comprises a telescopic device and a load bearing box, the top of the load bearing box is provided with a hook, the load bearing box is used for providing a pulling force required by a static load test for a stepping gear, the top of the telescopic device is provided with a bearing plane, and the hook is arranged on the bearing plane. A pressure sensor is arranged on the bearing plane, and the bearing box is mounted on the pressure sensor; wherein the pressure sensor is used for detecting the pressure of the bearing box on the telescopic device, and after the hook is in contact with the stepping gear, the height of the telescopic device is gradually reduced until the reading of the pressure sensor reaches a preset stable value, so that the tensile force borne by the stepping gear is gradually increased to a preset test value. According to the invention, the bearing box can be supported in the test process, the test safety can be ensured even if the stepping gear is broken, and the accurate and effective static load on the stepping gear is ensured at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of rigid ladder safety testing, and in particular relates to a rigid ladder static load testing device and method. Background Art

[0002] As a kind of safety tool, the reliability of hard ladder (including bamboo ladder, wooden ladder, aluminum alloy ladder and composite ladder) directly affects personal safety. It needs to be inspected every year. The test cycle is usually one year. Static load test is generally adopted. The current traditional test method is to conduct static load tensile test on each step of the hard ladder in the laboratory. For example, after hanging the tension hook on the step, use a tensioner or manually add a counterweight to apply pressure to the hard ladder for 5 minutes. After the time is up, remove the tension, manually replace the step position to be tested, and conduct the corresponding step test. In this test method, it is necessary to manually replace the tension hook, and when conducting different step tests, in order to ensure the force direction, it is necessary to change the position of the counterweight or the pulling point. The operation frequency of the test personnel is high and the labor intensity is high. In addition, during the test, if the step of the hard ladder breaks, the counterweight or the hook on it is easy to cause damage to the surrounding equipment or personnel, and the safety is poor. Summary of the invention

[0003] The purpose of the present invention is to provide a static load test device and method for a rigid ladder in order to overcome the defects of the prior art. A load-bearing box is used to test the pedals. The load-bearing box can be supported during the test. Even if the pedal breaks, the safety of the test can be guaranteed, while ensuring that the pedals are subjected to accurate and effective static loads.

[0004] The object of the present invention is achieved through the following technical solutions:

[0005] A static load test device for a rigid ladder, comprising a telescopic device and a load-bearing box, wherein a hook is arranged on the top of the load-bearing box, and the load-bearing box is used to provide the step with the tension required for the static load test, and the top of the telescopic device has a bearing plane, a pressure sensor is arranged on the bearing plane, and the load-bearing box is installed on the pressure sensor;

[0006] The pressure sensor is used to detect the pressure of the load-bearing box on the telescopic device. After the hook contacts the step, the height of the telescopic device gradually decreases until the reading of the pressure sensor reaches a preset stable value, so that the tension on the step gradually increases to a preset test value.

[0007] In one embodiment, it further comprises a displacement assembly, the displacement assembly comprises a slide rail and a slide plate arranged on the slide rail, the telescopic device is mounted on the slide plate, and the bottom of the slide plate has a plurality of rollers arranged on the slide rail;

[0008] Through this implementation, since the load-bearing box needs to be gradually displaced during the test to test each pedal gear, and the load-bearing box will make the weight of the entire device heavier after counterweighting, that is, the set displacement assembly is utilized to facilitate the displacement of the telescopic device, thereby reducing the labor intensity of the test personnel.

[0009] In one embodiment, it further comprises a control box, the telescopic device and the pressure sensor are both electrically connected to the control box, and a display screen connected to the pressure sensor is provided on the housing of the control box;

[0010] Through the present embodiment, it is convenient for the test personnel to drive the telescopic device to rise or fall through the control box. For example, when the hook of the load-bearing box is gradually connected to the pedal to be tested, the pressure value received by the pressure sensor gradually decreases. At the same time, the pressure value detected by the pressure sensor can be displayed in real time on the display screen of the control box. That is, it is convenient for the test personnel to observe the force of the pressure sensor at the control box while operating the telescopic device to rise or fall, thereby improving the accuracy of the test and reducing the labor intensity of the test personnel.

[0011] In one embodiment, the telescopic device is a hydraulic cylinder, an electric hydraulic pump is arranged in the control box, and a control button connected to the electric hydraulic pump is arranged on the housing of the control box.

[0012] In one embodiment, a driving assembly is disposed in the skateboard, an output shaft of the driving assembly is connected to the roller, and a motor of the driving assembly is connected to the control box;

[0013] Through this implementation, that is, the motor of the driving assembly is controlled by the control box, so that the slide connected to the roller is displaced on the slide rail so that the load-bearing box can reach the working position, that is, the tester can complete the entire static load test of the hard ladder at the control box.

[0014] In one embodiment, the load-bearing box has a counterweight space therein, the counterweight space is used to accommodate a counterweight block, and one side of the load-bearing box has an opening;

[0015] Through this implementation, the load-bearing box and the counterweight block are independent of each other, which makes it convenient to transport the entire device. For example, the load-bearing box can be set on the telescopic device, and then the counterweight block can be added to the counterweight space in the load-bearing box. At the same time, it is also convenient to adjust the pressure on the pedal according to the needs of the static load test.

[0016] In one embodiment, a buffer is further provided on the pressure sensor, and the load-bearing box is mounted on the buffer;

[0017] Through this embodiment, the buffer member is provided to increase the deformation space between the load-bearing box and the pressure sensor, so that after the load-bearing box contacts the pedal, the pressure value change speed of the pressure sensor is slowed down, thereby improving the adjustment accuracy;

[0018] The present invention also provides a static load test method for a rigid ladder, based on the above-mentioned automatic static load test device for a rigid ladder, comprising the following steps:

[0019] Step S1, placing the hard ladder in a working state, and obtaining the horizontal distance between two adjacent steps in the hard ladder in the working state;

[0020] Step S2, move the telescopic device to the front end of the first step at the bottom of the hard ladder, add a counterweight block into the load-bearing box, until the reading of the pressure sensor is not less than the sum of the preset test value of the static load of the step and the deadweight value of the load-bearing box, and the reading is the initial pressure value;

[0021] Step S3, driving the telescopic device to gradually rise, so that it drives the load-bearing box to rise to the height of the first step, and then moving it horizontally in the direction close to the first step until the hook of the load-bearing box is located above the first step, and then stopping the telescopic device;

[0022] Step S4, driving the telescopic device to gradually descend until the reading of the pressure sensor reaches the difference between the initial pressure value and the static load preset test value, then stopping the descent and maintaining the preset test time;

[0023] Step S5, drive the telescopic device to gradually rise until the hook of the load-bearing box is above the first step, and according to the horizontal distance between the two adjacent steps obtained in step S1, move the load-bearing box horizontally away from the first step to the front end of the second step, repeat steps S2 to S4, and complete the static load test of each step in the hard ladder one by one.

[0024] In one embodiment, in step S2, the preset test value of the static load of the pedal is 1765N.

[0025] In one embodiment, in step S1, obtaining the horizontal distance between two adjacent steps of a rigid ladder in a working state includes:

[0026] The included angle between the rigid ladder in the working state and its leaning surface is obtained, and the horizontal spacing between the two adjacent steps in the rigid ladder in the working state is obtained according to the height difference between the two adjacent steps in the rigid ladder.

[0027] The beneficial effects of the present invention are:

[0028] (1) The pedal is tested using a load-bearing box, which is set on the telescopic device. A pressure sensor between the telescopic device and the load-bearing box is used to detect the pressure change of the load-bearing box on the telescopic device, so that the load-bearing box can be supported during the test while meeting the static load test requirements of the pedal. Even if the pedal breaks during the test, the safety of the test can be guaranteed, and the pedal can be subjected to an effective static load.

[0029] (2) The control box is used to control the horizontal and vertical displacement of the telescopic device without manual handling. At the same time, the test personnel can observe the changes in the pressure sensor from the display screen of the control box, thereby improving the accuracy of the test and greatly reducing the labor intensity of the test personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0031] Figure 1 A schematic structural diagram of an embodiment of the present invention is shown;

[0032] Figure 2 A schematic structural diagram showing another embodiment of the present invention;

[0033] In the drawings, like reference numerals are used for like parts. The drawings are not necessarily to scale.

[0034] Reference numerals:

[0035] 1-Hydraulic cylinder, 2-Load-bearing box, 3-Hook, 4-Pressure sensor, 5-Slide plate, 6-Slide rail, 7-Control box, 8-Display screen, 9-Control button, 10-Buffer. DETAILED DESCRIPTION

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] Example 1

[0038] The present invention provides a static load test device for a hard ladder, such as Figure 1 As shown, it includes a telescopic device and a load-bearing box 2, a hook 3 is provided on the top of the load-bearing box 2, the load-bearing box 2 is used to provide the tension required for the static load test to the step, the top of the telescopic device has a bearing plane, a pressure sensor 4 is provided on the bearing plane, and the load-bearing box 2 is installed on the pressure sensor 4;

[0039] The pressure sensor 4 is used to detect the pressure of the load-bearing box 2 on the telescopic device. After the hook 3 contacts the step, the height of the telescopic device gradually decreases until the reading of the pressure sensor 4 reaches a preset stable value, so that the tension on the step gradually increases to a preset test value.

[0040] It should be noted that if Figure 1 As shown, it shows a schematic diagram of the process of placing the load-bearing box 2 on the pressure sensor 4. In this embodiment, the telescopic device is used to support the load-bearing box 2. When the load-bearing box 2 is not in contact with the pedal, the pressure value detected by the pressure sensor 4 is the dead weight of the load-bearing box 2. After the hook 3 of the load-bearing box 2 is hung on the pedal to be tested, the height of the telescopic device is lowered to allow the pedal to participate in the support. When the pressure value detected by the pressure sensor 4 changes to the dead weight of the load-bearing box 2 minus the preset test value, it means that the pressure on the pedal has reached the preset test value. For example, the preset test value is set to 1765N. When the pressure value detected by the pressure sensor 4 is the dead weight of the load-bearing box 2 minus 1765N, the height of the telescopic device is maintained and it remains stationary for 5 minutes to continuously apply a static load test to the pedal. At this time, even if the pedal is damaged, the telescopic device can still support the load-bearing box 2 to avoid the risk of the load-bearing box 2 falling, thereby ensuring the safety of the test and at the same time ensuring that the pedal is subjected to an accurate static load to ensure the accuracy of the test.

[0041] Furthermore, if Figure 1 As shown, it also includes a displacement assembly, which includes a slide rail 6 and a slide plate 5 arranged on the slide rail 6, the telescopic device is installed on the slide plate 5, and the bottom of the slide plate 5 has a plurality of rollers arranged on the slide rail 6;

[0042] It should be noted that, since the load-bearing box 2 needs to be gradually displaced to each step during the test to perform a static load test on each step, and the load-bearing box 2 will cause the weight of the entire device to be relatively large after being counterweighted, the displacement assembly is used to facilitate the displacement of the telescopic device, thereby reducing the labor intensity of the test personnel;

[0043] Furthermore, if Figure 1 As shown, it also includes a control box 7, the telescopic device and the pressure sensor 4 are connected to the control box 7, and a display screen 8 connected to the pressure sensor 4 is provided on the shell of the control box 7;

[0044] It should be noted that the control box 7 is provided to facilitate the test personnel to directly drive the telescopic device to rise or fall through the control box 7, and the control box 7 is connected to the pressure sensor 4 through the sensor wiring. For example, when the hook 3 of the load-bearing box 2 is gradually connected to the step to be tested, the pressure value received by the pressure sensor 4 gradually decreases, and the pressure value detected by the pressure sensor 4 can be displayed in real time on the display screen 8 of the control box 7, which is convenient for the test personnel to observe the force of the pressure sensor 4 at the control box 7 while operating the telescopic device to rise or fall, thereby ensuring the safety of the test personnel, improving the accuracy of the test, and also reducing the labor intensity of the test personnel;

[0045] Specifically, the telescopic device is a hydraulic cylinder 1, an electric hydraulic pump is arranged in the control box 7, a control button 9 connected to the electric hydraulic pump is arranged on the housing of the control box 7, and the electric hydraulic pump is connected to the hydraulic cylinder 1 through a hydraulic control line;

[0046] A driving assembly is arranged inside the slide plate 5, the output shaft of the driving assembly is connected to the roller, and the motor of the driving assembly is connected to the control box 7, that is, the motor of the driving assembly is controlled by the control box 7, so that the slide plate 5 connected to the roller is displaced on the slide rail 6, so that the load-bearing box 2 can reach the working position, that is, the test personnel can complete the entire static load test of the hard ladder at the control box 7;

[0047] Example 2

[0048] In this embodiment, a buffer is added between the load-bearing box and the pressure sensor, and the rest of the same parts as those in Embodiment 1 are not described in detail.

[0049] It should be noted that if Figure 2 As shown, a buffer 10 is set between the load-bearing box 2 and the pressure sensor 4. The buffer 10 can be composed of an upper plate and a lower plate, and a spring is connected between the upper plate and the lower plate. That is, when the load-bearing box is placed on the buffer 10, the buffer 10 is subjected to the gravity of the load-bearing box 2, and the spring inside it is compressed. At this time, the pressure value of the pressure sensor 4 is the sum of the deadweight of the buffer 10 and the load-bearing box 2, which is recorded as the initial value. After the load-bearing box 2 is hung on the pedal to be tested, the pedal participates in supporting the load-bearing box 2, and the spring inside the buffer 10 can slowly recover, that is, the buffer is set. Component 10 increases the deformation space between the load-bearing box 2 and the pressure sensor 4, that is, after the load-bearing box 2 contacts the step, the speed of change of the pressure value of the pressure sensor 4 is slowed down. When the value displayed by the pressure sensor 4 is the pressure value of the difference between the initial value and 1765N, the descent of the telescopic device is stopped. Compared with Example 1, when the telescopic device maintains the same descent speed, the change speed of the pressure sensor can be made slower, thereby improving the adjustment accuracy, so that in the actual operation process, the load-bearing box 2 can be used to apply an accurate static load to the step;

[0050] Example 3

[0051] This embodiment provides another load-bearing box 2 structure, and the rest of the same parts as those in the embodiment 1 are not described in detail.

[0052] That is, in this embodiment, the load-bearing box 2 has a counterweight space, and the counterweight space is used to accommodate the counterweight block, and one side of the load-bearing box 2 has an opening, that is, the load-bearing box 2 and the counterweight block are independent of each other, which is convenient for transporting the entire device. For example, the load-bearing box 2 can be first set on the telescopic device, and then the counterweight block is added to the counterweight space in the load-bearing box 2. After the test is completed, the counterweight block is first taken out and put away before transporting the load-bearing box 2, which reduces the labor intensity of the test personnel and is also convenient for adjusting the pressure on the pedal according to the needs of the static load test;

[0053] Example 4

[0054] The present invention also provides a static load test method for a rigid ladder, based on the test device of the above embodiment, comprising the following steps:

[0055] Step S1, placing the hard ladder in a working state, and obtaining the horizontal distance between two adjacent steps in the hard ladder in the working state;

[0056] Step S2, move the telescopic device to the front end of the first step at the bottom of the hard ladder, add a counterweight block into the load-bearing box, until the reading of the pressure sensor is not less than the sum of the preset test value of the static load of the step and the deadweight value of the load-bearing box, and the reading is the initial pressure;

[0057] Step S3, driving the telescopic device to gradually rise, so that it drives the load-bearing box to rise to the height of the first step, and then moving it horizontally in the direction close to the first step until the hook of the load-bearing box is located above the first step, and then stopping the telescopic device;

[0058] Step S4, driving the telescopic device to gradually descend until the reading of the pressure sensor reaches the difference between the initial pressure value and the static load preset test value, then stopping the descent and maintaining the preset test time;

[0059] Step S5, drive the telescopic device to gradually rise until the hook of the load-bearing box is above the first step, and according to the horizontal distance between the two adjacent steps obtained in step S1, move the load-bearing box horizontally away from the first step to the front end of the second step, repeat steps S2 to S4, and complete the static load test of each step in the hard ladder one by one.

[0060] Specifically, in step S2, the preset test value of the static load of the pedal is 1765N. If the deadweight pressure value of the load-bearing box is set to G, in step S2, a counterweight block is added to the load-bearing box until the pressure value detected by the pressure sensor is not less than G+1765. This pressure is called the initial pressure, represented by G0. In step S4, when the reading of the pressure sensor is G0-1765, the descent is stopped and the static load test is maintained for 5 minutes.

[0061] Specifically, in step S1, the horizontal distance between two adjacent steps in the hard ladder in the working state is obtained, including:

[0062] The included angle between the rigid ladder in the working state and its leaning surface is obtained, and the horizontal spacing between the two adjacent steps in the rigid ladder in the working state is obtained according to the height difference between the two adjacent steps in the rigid ladder.

[0063] It should be noted that this method can effectively improve the safety of the test, avoid damage to surrounding equipment and test personnel, and also ensure the accuracy of the step test;

[0064] Furthermore, control instructions can be pre-entered in the control box to achieve completely unmanned automated testing and reduce labor costs;

[0065] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0066] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. A static load test device for a rigid ladder, characterized in that: It comprises a telescopic device and a load-bearing box, wherein a hook is arranged on the top of the load-bearing box, and the load-bearing box is used to provide the tension required for the static load test to the step, and the top of the telescopic device has a bearing plane, and a pressure sensor is arranged on the bearing plane, and the load-bearing box is installed on the pressure sensor; Among them, the pressure sensor is used to detect the pressure of the load-bearing box on the telescopic device. After the hook contacts the pedal, the height of the telescopic device gradually decreases until the reading of the pressure sensor reaches a preset stable value, so that the tension on the pedal gradually increases to a preset test value.

2. A static load test device for a rigid ladder according to claim 1, characterized in that: It also includes a displacement component, which includes a slide rail and a slide plate arranged on the slide rail, the telescopic device is installed on the slide plate, and the bottom of the slide plate has a plurality of rollers arranged on the slide rail.

3. A static load test device for a rigid ladder according to claim 2, characterized in that: It also includes a control box, the telescopic device and the pressure sensor are electrically connected to the control box, and a display screen connected to the pressure sensor is arranged on the shell of the control box.

4. A static load test device for a rigid ladder according to claim 3, characterized in that: The telescopic device is a hydraulic cylinder, an electric hydraulic pump is arranged in the control box, and a control button connected to the electric hydraulic pump is arranged on the shell of the control box.

5. The static load test device for a rigid ladder according to claim 3, characterized in that: A driving assembly is arranged in the skateboard, an output shaft of the driving assembly is connected to the roller, and a motor of the driving assembly is connected to the control box.

6. The static load test device for a rigid ladder according to claim 1, characterized in that: The load-bearing box has a counterweight space therein, the counterweight space is used to accommodate a counterweight block, and one side of the load-bearing box has an opening.

7. The static load test device for a rigid ladder according to claim 1, characterized in that: The pressure sensor is also provided with a buffer component, and the load-bearing box is installed on the buffer component.

8. A static load test method for a rigid ladder, based on the static load automatic test device for a rigid ladder according to any one of claims 1 to 7, characterized in that: The steps include: Step S1, placing the hard ladder in a working state, and obtaining the horizontal distance between two adjacent steps in the hard ladder in the working state; Step S2, move the telescopic device to the front end of the first step at the bottom of the hard ladder, add a counterweight block into the load-bearing box, until the reading of the pressure sensor is not less than the sum of the preset test value of the static load of the step and the deadweight value of the load-bearing box, and the reading is the initial pressure value; Step S3, driving the telescopic device to gradually rise, so that it drives the load-bearing box to rise to the height of the first step, and then moving it horizontally in the direction close to the first step until the hook of the load-bearing box is located above the first step, and then stopping the telescopic device; Step S4, driving the telescopic device to gradually descend until the reading of the pressure sensor reaches the difference between the initial pressure value and the static load preset test value, then stopping the descent and maintaining the preset test time; Step S5, drive the telescopic device to gradually rise until the hook of the load-bearing box is above the first step, and according to the horizontal distance between the two adjacent steps obtained in step S1, move the load-bearing box horizontally away from the first step to the front end of the second step, repeat steps S2 to S4, and complete the static load test of each step in the hard ladder one by one.

9. A static load test method for a rigid ladder according to claim 8, characterized in that: In step S2, the preset test value of the gear static load is 1765N.

10. A static load test method for a rigid ladder according to claim 8, characterized in that: In step S1, the horizontal distance between two adjacent steps of the hard ladder in the working state is obtained, including: The included angle between the rigid ladder in the working state and its leaning surface is obtained, and the horizontal spacing between the two adjacent steps in the rigid ladder in the working state is obtained according to the height difference between the two adjacent steps in the rigid ladder.

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