Device and method for measuring gap between bearing nut and safety nut of fixed car lifting jack

Abstract

The invention discloses a device and a method for measuring a gap between a bearing nut and a safety nut of a fixed car lifting jack. The device comprises a main scale and a vernier scale, wherein the vernier scale comprises a vernier part which is arranged on the main scale in a sliding manner and a measuring part which is arranged at the front end of the vernier part; the measuring part is located below the vernier part, and the front measuring end face and the rear measuring end face of the measuring part are both perpendicular to the main ruler. The measuring method comprises the following steps: pressing the front end surface of the main ruler on the lower reference surface of the bearing nut; the vernier scale is adjusted to enable the measuring part to extend into the gap between the bearing nut and the safety nut; continuing to adjust the vernier scale to lightly press the rear measuring end surface of the measuring part on the upper reference surface of the safety nut; the distance between the rear measuring end face of the measuring part and the front end face of the main ruler is the gap between the bearing nut and the safety nut. The device is simple in structure and easy to produce in batches. When the device is used for measuring the gap between the bearing nut and the safety nut of the fixed car lifting jack, the measurement working efficiency and the measurement precision can be remarkably improved.

Description

Technical Field

[0001] The present application relates to the technical field of measuring tools, and in particular to a device and method for measuring the gap between a load-bearing nut and a safety nut of a fixed vehicle lifting machine. Background Art

[0002] The fixed vehicle lift is an essential tool for vehicle maintenance. The bearing nut of the fixed vehicle lift is a key component and plays a bearing role in the vehicle lift operation. When the fixed vehicle lift is newly manufactured, the gap between the bearing nut and the safety nut is 10mm. When the gap between the bearing nut and the safety nut is less than the standard value of 7mm, it means that the bearing nut is worn beyond the limit and must be replaced immediately to avoid the thread breakage caused by the bearing nut being worn beyond the limit, which may cause the vehicle to roll over during the vehicle lift. Therefore, the gap between the bearing nut and the safety nut must be measured regularly during maintenance.

[0003] See also Figure 1 , which is a schematic diagram of the structure of a fixed vehicle lifting machine, includes a bracket box 1 and a bearing nut 2 and a safety nut 3 installed in the bracket box 1. According to on-site surveying and mapping, the total width a of the inner space of the bracket box 1 is 250mm, the diameter R of the bearing nut 2 is 150mm, and the diameter r of the safety nut 3 is 105mm. The widest part of the working space for measuring the gap between the bearing nut 2 and the safety nut 3 is (250mm-105mm) / 2=72.5mm, and the narrowest part is only (250mm-150mm) / 2=50mm. Therefore, the working space for measuring the gap between the bearing nut and the safety nut is narrow.

[0004] The inner measuring jaw of the vernier caliper can be used to measure the gap, but since the diameter of the load-bearing nut and the safety nut differs by 45 mm, and the length of the inner measuring jaw of the vernier caliper is only 10 mm, the vernier caliper cannot be used to measure the gap between the load-bearing nut and the safety nut.

[0005] The existing methods for measuring the gap between the load-bearing nut and the safety nut are: (1) using a steel ruler for measurement. This measurement method itself has a low measurement accuracy of 1 mm. In addition to factors such as reading error and human measurement error, the final measurement cumulative error reaches 1 mm-2 mm. In order to ensure the safety of the fixed crane, the load-bearing nut is often replaced in advance, resulting in high maintenance costs and other problems. (2) Using a thickness gauge for measurement. This measurement method requires the production of a non-standard thickness gauge and takes a long time to measure. A single measurement takes 3 minutes to 5 minutes and the error is also large, reaching 0.3-0.5 mm. Summary of the invention

[0006] The purpose of the present application is to provide a device and method for measuring the gap between the load-bearing nut and the safety nut of a fixed crane, so as to solve the deficiencies mentioned in the background technology. Compared with the method of measuring the gap between the load-bearing nut and the safety nut in the prior art, the device and method of the present application can significantly improve the measurement accuracy and efficiency.

[0007] On the one hand, the device provided in the present application for measuring the gap between the load-bearing nut and the safety nut of a fixed vehicle lifting machine includes a main scale and a vernier scale; wherein the vernier scale includes a vernier part slidably mounted on the main scale, and a measuring part arranged at the front end of the vernier part; the measuring part is located below the vernier part and the front measuring end face and the rear measuring end face of the measuring part are both perpendicular to the main scale.

[0008] In some embodiments, the measurements are 15 mm to 20 mm long and 3 mm to 7 mm wide.

[0009] In some embodiments, the front end face of the main scale is parallel to the front measuring end face and the rear measuring end face of the measuring part.

[0010] In some embodiments, the scale on the main scale uses the front end of the main scale as the 0 scale; and the 0 scale on the vernier scale is aligned with the rear measuring end surface of the measuring part.

[0011] In some embodiments, the vernier ruler further includes a fastener installed at the top of the vernier portion for locking the vernier portion.

[0012] On the other hand, the present application provides a method for measuring the gap between the load-bearing nut and the safety nut of a fixed vehicle lifting machine, which adopts the above-mentioned device and includes:

[0013] Press the front end face of the main ruler against the lower reference face of the load-bearing nut; adjust the vernier ruler so that the measuring part extends into the gap between the load-bearing nut and the safety nut; continue to adjust the vernier ruler so that the rear measuring end face of the measuring part lightly presses against the upper reference face of the safety nut; the distance between the rear measuring end face of the measuring part and the front end face of the main ruler is the gap between the load-bearing nut and the safety nut.

[0014] In some embodiments, a method for measuring the clearance between a load nut and a safety nut of a fixed-type crane includes:

[0015] Press the front end face of the main scale against the lower reference surface of the load-bearing nut; adjust the vernier scale so that the measuring part extends into the gap between the load-bearing nut and the safety nut; continue to adjust the vernier scale so that the rear measuring end face of the measuring part lightly presses against the upper reference surface of the safety nut; read the scale on the main scale corresponding to the 0 scale on the vernier scale, which is the gap between the load-bearing nut and the safety nut.

[0016] Compared with the prior art, this application has the following advantages and beneficial effects:

[0017] The device of the present application has a simple structure and is easy to mass produce. The device of the present application is used to measure the gap between the load-bearing nut and the safety nut of a fixed crane. A single measurement takes only 1 minute, and the measurement error is only 0.02mm. Compared with the thickness gauge measurement, the measurement efficiency of the device of the present application can be increased by more than 80%; compared with the thickness gauge measurement and the steel plate ruler measurement, the measurement accuracy of the device of the present application is significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a fixed vehicle lifting machine;

[0019] Figure 2 This is a schematic diagram of the structure of the device in the embodiment of the present application;

[0020] Figure 3 This is a schematic diagram of the use of the device in the embodiment of the present application.

[0021] Figure markings: 1-bracket box, 2-bearing nut, 3-safety nut, 4-main scale, 4a-front end face, 5-vernier scale, 6-vernier part, 7-measuring part, 7a-front measuring end face, 7b-rear measuring end face, 8-fastener. DETAILED DESCRIPTION

[0022] The principles and features of the present application are described below in conjunction with embodiments and drawings. The examples given are only used to explain the present application and are not used to limit the scope of the present application.

[0023] Example

[0024] See also Figure 2 , which is a schematic structural diagram of a device for measuring the clearance between a load-bearing nut and a safety nut of a fixed vehicle lifting machine in this embodiment, the device comprises a main scale (4) and a vernier scale (5); the vernier scale (5) comprises a vernier portion (6) slidably mounted on the main scale (4), and a measuring portion (7) arranged at the front end of the vernier portion (6); the measuring portion (7) is located below the vernier portion (6) and the front measuring end face (7a) and the rear measuring end face (7b) of the measuring portion (7) are both perpendicular to the main scale (4); and the front end face (4a) of the main scale (4) is parallel to the front measuring end face (7a) and the rear measuring end face (7b) of the measuring portion (7).

[0025] Considering that the reference surfaces of the load-bearing nut and the safety nut are quite different in size, the diameter R of the load-bearing nut is 150 mm, and the diameter r of the safety nut is 105 mm. In order to enable the measuring portion (7) to be used for measuring the gap between the load-bearing nut and the safety nut of the fixed vehicle lifting machine, in this embodiment, the length b of the measuring portion (7) is set to 20 mm, and the width h of the measuring portion (7) is set to 5 mm, so that the measuring portion (7) can extend into the gap between the load-bearing nut and the safety nut for measurement.

[0026] To facilitate reading, in this embodiment, the scale on the main scale (4) takes the front end of the main scale (4) as the 0 scale; the 0 scale on the vernier scale (5) is aligned with the rear measuring end surface (7b) of the measuring part (7).

[0027] A fastener (8) is also installed at the top of the vernier ruler (5). In this embodiment, the fastener (8) is a locking screw, and the fastener (8) is used to lock the vernier part (6) of the vernier ruler (5).

[0028] The present application eliminates the measuring part installed on the main scale in the traditional vernier caliper, uses the front end face (4a) of the main scale (4) as the measuring end face, and uses the front measuring end face (7a) or the rear measuring end face (7b) of the measuring part (7) as the other measuring end face. The length of the measuring part (7) is 20 mm, thereby realizing the gap measurement of two reference surfaces with large size differences.

[0029] The following will be combined Figure 3 A method for using the device of the present application is provided: pressing the front end face (4a) of the main scale (4) against the lower reference face of the bearing nut; adjusting the vernier scale (5) so that the measuring part (7) extends into the gap between the bearing nut and the safety nut; continuing to adjust the vernier scale (5) so that the rear measuring end face (7b) of the measuring part (7) is lightly pressed against the upper reference face of the safety nut; locking the vernier part (6) of the vernier scale (5) with a fastener (8), taking out the device, and reading the scale corresponding to the 0 scale on the vernier scale (5) on the main scale (4), that is, the distance between the rear measuring end face (7b) of the measuring part (7) and the front end face (4a) of the main scale (4), that is, the gap between the bearing nut and the safety nut.

[0030] Prior to this application, the applicant used a thickness gauge to measure the bearing nut clearance of the fixed frame locomotive, and a single measurement took 3 minutes to 5 minutes. However, with the device of this application, a single measurement took only 1 minute. For the fixed frame locomotive that overhauls 8-car trains, there are 96 bearing nut clearances. Using the device of this application to measure the 96 bearing nut clearances can reduce the working time by 192 minutes to 384 minutes, and the working efficiency can be increased by more than 80%. In addition, the measurement error of the device of this application is only 0.02 mm, which is significantly improved compared with the measurement of steel plate ruler and thickness gauge.

[0031] Therefore, the device of the present application can significantly improve the work efficiency of measuring the clearance of the load-bearing nut and significantly improve the measurement accuracy, so that the load-bearing nut can be replaced in a timely manner to ensure the safety of the fixed frame vehicle during use.

[0032] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A device for measuring the clearance between a load-bearing nut and a safety nut of a fixed vehicle lifting machine, characterized in that: The invention comprises a main scale (4) and a vernier scale (5); the vernier scale (5) comprises a vernier portion (6) slidably mounted on the main scale (4), and a measuring portion (7) arranged at the front end of the vernier portion (6); the measuring portion (7) is located below the vernier portion (6), and the front measuring end surface (7a) and the rear measuring end surface (7b) of the measuring portion (7) are both perpendicular to the main scale (4); the measuring portion (7) is 15 mm to 20 mm long and 3 mm to 7 mm wide.

2. The device according to claim 1, characterized in that: The front end face (4a) of the main scale (4) is parallel to the front measuring end face (7a) and the rear measuring end face (7b) of the measuring part (7).

3. The device according to claim 1, characterized in that: The scale on the main scale (4) takes the front end of the main scale (4) as the 0 scale; and the 0 scale on the vernier scale (5) is aligned with the rear measuring end surface (7b) of the measuring part (7).

4. The device according to claim 1, characterized in that: The vernier ruler (5) also includes a fastener (8) which is mounted on the top of the vernier portion (6) and is used to lock the vernier portion (6).

5. A method for measuring the clearance between a load-bearing nut and a safety nut of a fixed vehicle lifting machine, characterized in that: The device of claim 1 is used for measurement, comprising: The front end face (4a) of the main ruler (4) is pressed against the lower reference face of the bearing nut; the vernier ruler (5) is adjusted so that the measuring part (7) extends into the gap between the bearing nut and the safety nut; the vernier ruler (5) is further adjusted so that the rear measuring end face (7b) of the measuring part (7) is lightly pressed against the upper reference face of the safety nut; the distance between the rear measuring end face (7b) of the measuring part (7) and the front end face (4a) of the main ruler (4) is the gap between the bearing nut and the safety nut.

6. A method for measuring the clearance between a load-bearing nut and a safety nut of a fixed vehicle lifting machine, characterized in that: The device described in claim 3 is used for measurement, comprising: The front end face (4a) of the main scale (4) is pressed against the lower reference surface of the load-bearing nut; the vernier scale (5) is adjusted so that the measuring part (7) extends into the gap between the load-bearing nut and the safety nut; the vernier scale (5) is further adjusted so that the rear measuring end face (7b) of the measuring part (7) is lightly pressed against the upper reference surface of the safety nut; and the scale corresponding to the 0 scale on the vernier scale (5) on the main scale (4) is read, i.e., the gap between the load-bearing nut and the safety nut.

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