CN204964110U - Fluid pressure type multrirange stack force standard machine - Google Patents

Abstract

The utility model discloses a hydraulic multi-range superposition force standard machine, which comprises an oil cylinder, a large piston ascending oil hole and a large piston descending oil hole are arranged on the wall; the large piston is arranged in the oil cylinder, and the wall is arranged There are a small piston ascending oil hole and a small piston descending oil hole; the small piston is set in the large piston; the large sensor is set on the top of the large piston and a large tray is set between the large piston; the small sensor is set on the top of the small piston; The limiter is arranged between the large piston and the small piston in a sealing manner. In the utility model, the oil liquid enters between the large piston and the bottom of the small piston through the ascending oil hole of the small piston, so that the small sensor applies a loading force to the large tray to measure the small range; the oil enters between the oil cylinder and the bottom of the large piston from the ascending oil hole of the large piston , so that the large piston applies a loading force to the large tray to measure a large range, which can measure both a large range and a small range. The small sensor ensures the stability of the small range test and improves the accuracy of the test.

Description

Hydraulic multi-range superposition force standard machine

technical field

The utility model belongs to the field of mechanical performance detection, in particular to a hydraulic multi-range superposition force standard machine.

Background technique

In recent years, load cells and load cells have been widely used in design departments, machinery, electronics, metallurgy, national defense and construction industries. With the rapid development of the production and use of various sensors, it is urgent for the metrology department to conduct comprehensive and accurate inspections and provide consistent and reliable technical indicators. To this end, our country has built various types of force standard machines.

The force standard machine uses a standard force sensor with higher accuracy than the dynamometer to be verified as a standard, and is connected in series with the calibrated/verified force sensor to load the force standard machine hydraulically or mechanically; due to its low cost, work With high efficiency, it has been widely used in the mechanical performance testing of various load cells, force sensors, and dynamometers in recent years. However, the superimposed force standard machine is heavily dependent on the standard sensor used. The standard sensor is unstable when measuring a small range, and the measurement accuracy is low. In order to solve this problem, the current method is to replace the standard sensor with a small range during the measurement process. This is not only cumbersome to operate and cannot be used for continuous measurement, but also easily causes damage if a small-range standard sensor is used on the large oil cylinder piston.

Utility model content

In order to solve the above technical problems, the utility model provides a hydraulic multi-range superposition force standard machine.

In order to achieve the above object, the technical scheme of the utility model is as follows:

The utility model provides a hydraulic multi-range superposition force standard machine, comprising:

Oil cylinder, the wall of the oil cylinder is provided with a large piston ascending oil hole and a large piston descending oil hole;

The large piston is arranged in the oil cylinder and moves up and down in the oil cylinder. The wall of the large piston is provided with a small piston ascending oil hole and a small piston descending oil hole;

The small piston is arranged in the large piston and moves up and down in the large piston;

The large sensor is arranged on the top of the large piston, and a large tray is arranged between the large sensor and the large piston;

The small sensor is arranged on the top of the small piston and inside the large piston, and a small tray is arranged between the small sensor and the small piston;

The limiter is sealed between the large piston and the small piston.

In the utility model, the oil liquid enters the space between the big piston and the bottom of the small piston through the rising oil hole of the small piston, so that the small sensor moves upward in the big piston and applies a loading force to the big tray for measuring the small range. At this time, the big piston and The large sensor does not work; the oil enters the space between the oil cylinder and the bottom of the large piston from the ascending oil hole of the large piston, so that the large piston moves upward in the oil cylinder to apply a loading force to the large pallet for measuring a large range, at this time the small piston Compared with the existing technology, it can measure both large and small ranges, and is easy to operate, and the small sensor ensures the stability of the small range test and improves the accuracy of the test.

The above-mentioned large piston in the utility model includes a connected large piston head and a large piston connecting portion, the large piston head is connected to the inner wall of the oil cylinder in a sealed manner, the large piston connecting portion is connected to the large tray, and the large piston connecting portion is connected to the inner wall of the oil cylinder An oil inlet space for descending the large piston is arranged between them, and the oil hole for descending the large piston communicates with the oil inlet space for descending the large piston.

The above-mentioned small piston in the utility model includes a connected small piston head and a small piston connecting portion, the small piston head is connected to the inner wall of the large piston in a sealed manner, the small piston connecting portion is connected to the small tray, and the small piston connecting portion is connected to the oil cylinder. A small piston oil overflow space is arranged between the inner walls, and the small piston descending oil hole communicates with the small piston descending oil inlet space.

In the utility model, the bottom of the above-mentioned large piston head is provided with a large boss, and the large diameter of the large boss is smaller than the large diameter of the large piston head; the bottom of the above-mentioned small piston head is provided with a small boss. The major diameter of the boss is smaller than the major diameter of the small piston head.

On the basis of the above-mentioned technical scheme, the following improvements can also be made:

As a preferred solution, the bottom of the above-mentioned small piston and/or large piston is provided with an elastic member.

With the above-mentioned preferred solution, the elastic member avoids suction between the bottom of the small piston and the inner wall of the large piston, and the bottom of the large piston and the inner wall of the oil cylinder. Collisions, prolonging the life of small sensors.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of the present invention.

Fig. 2 is a schematic structural view of another embodiment of the present invention.

Among them, 10. Oil cylinder, 20. Large piston, 21. Large piston ascending oil hole, 22. Large piston descending oil hole, 23. Large tray, 30. Small piston, 31. Small piston ascending oil hole, 32. Small piston descending Oil hole, 33. small tray, 40. large sensor, 50. small sensor, 60. limit piece, 70. elastic piece.

detailed description

Preferred embodiments of the present utility model will be described in detail below in conjunction with the accompanying drawings.

In order to achieve the purpose of this utility model, as shown in Figure 1, a hydraulic multi-range superposition force standard machine is provided in one of the embodiments of the utility model, including:

The oil cylinder 10 is provided with a large piston ascending oil hole 21 and a large piston descending oil hole 22 on the wall of the oil cylinder 10;

The large piston 20 is arranged in the oil cylinder 10 and moves up and down in the oil cylinder 10. The wall of the large piston 20 is provided with a small piston ascending oil hole 31 and a small piston descending oil hole 32;

The small piston 30 is arranged in the large piston 20 and moves up and down in the large piston 20;

A large sensor 40 is arranged on the top of the large piston 20, and a large tray 23 is arranged between the large sensor 40 and the large piston 20;

A small sensor 50, which is arranged on the top of the small piston 30 and is located in the large piston 20, and a small tray 33 is arranged between the small sensor 50 and the small piston 30;

The limiting member 60 is sealingly arranged between the large piston 20 and the small piston 30 .

In this embodiment, the oil liquid enters the space between the large piston 20 and the bottom of the small piston 30 through the small piston ascending oil hole 31, so that the small sensor 50 moves upward in the large piston 20 and applies a loading force to the large tray 23 for measuring the small range. , at this time the large piston 20 and the large sensor 40 do not work; the oil enters the space between the oil cylinder 10 and the bottom of the large piston 20 from the large piston ascending oil hole 21, so that the large piston 20 moves upward in the oil cylinder 10 to the large tray 23 Apply a loading force to measure a large range. At this time, the small piston 30 and the small sensor 50 do not work. Compared with the prior art, it can measure both a large range and a small range. The operation is convenient, and the small sensor ensures a small range. The stability of the test improves the accuracy of the test.

In this embodiment, the above-mentioned large piston 20 includes a connected large piston head and a large piston connecting portion, the large piston head is connected to the inner wall of the oil cylinder 10 in a sealed manner, the large piston connecting portion is connected to the large tray 23, and the large piston connecting portion is connected to the large tray 23. A large piston descending oil inlet space is arranged between the inner walls of the oil cylinder 10, and the large piston descending oil hole 22 communicates with the large piston descending oil inlet space.

The above-mentioned small piston 30 in this embodiment includes a connected small piston head and a small piston connecting portion, the small piston head is connected to the inner wall of the large piston 20 in a sealed manner, the small piston connecting portion is connected to the small tray 33, and the small piston connecting portion A small piston descending oil inlet space is arranged between the inner wall of the oil cylinder 10, and the small piston descending oil hole 32 communicates with the small piston descending oil inlet space.

In this embodiment, the above-mentioned limiting member 60 includes a mounting part and a limiting part. The mounting part is arranged on the top of the large piston 20 , and the limiting part is arranged in the oil inlet space where the small piston descends and is in sealing connection with the inner wall of the large piston 20 .

In this embodiment, the bottom of the above-mentioned large piston head is provided with a large boss, and the major diameter of the large boss is smaller than the major diameter of the large piston head; the bottom of the above-mentioned small piston head is provided with a small boss. The major diameter of the boss is smaller than the major diameter of the small piston head.

As shown in Figure 2, in order to further optimize the implementation effect of the present utility model, in another embodiment of the present utility model, on the basis of the foregoing, the bottoms of the above-mentioned small piston 30 and the large piston 20 are provided with elastic 70 pieces.

Using the above-mentioned preferred scheme, the elastic member 70 avoids suction between the bottom of the small piston 30 and the inner wall of the large piston 20, the bottom of the large piston 20 and the inner wall of the oil cylinder 10, and on the other hand, prevents the small piston 20 from working. The sensor 50 has a hard collision with the large tray 23, prolonging the service life of the small sensor 50.

What is described above is only the preferred embodiment of the utility model, it should be pointed out that, for those of ordinary skill in the art, without departing from the premise of the utility model creative concept, some deformations and improvements can also be made. Belong to the protection scope of the utility model.

Claims (4)

1. hydraulic type multiple range superposed force Standard Machine, is characterized in that, comprising:

Oil cylinder, the wall body of described oil cylinder is provided with large piston rising oilhole and large piston decline oilhole;

Large piston, it to be arranged in described oil cylinder and to move up and down setting in described oil cylinder, the wall body of described large piston is provided with valve piston rising oilhole and valve piston decline oilhole;

Valve piston, it to be arranged in described large piston and to move up and down setting in described large piston;

Large sensor, it is arranged at described large top land, is provided with large pallet between described large sensor and described large piston;

Little sensor, it is arranged at described valve piston top and is positioned at described large piston, is provided with little pallet between described little sensor and described valve piston;

Locating part, it is arranged between described large piston and described valve piston hermetically.

2. hydraulic type multiple range superposed force Standard Machine according to claim 1, it is characterized in that, described large piston comprises connected large piston crown and large Piston connecting portion, described large piston crown is connected with the inner wall sealing ground of described oil cylinder, described large Piston connecting portion is connected with described large pallet, be provided with large piston decline oil-feed space between described large Piston connecting portion and the inwall of described oil cylinder, described large piston decline oilhole is communicated with described large piston decline oil-feed space.

3. hydraulic type multiple range superposed force Standard Machine according to claim 2, it is characterized in that, described valve piston comprises connected valve piston head and valve piston connecting portion, described valve piston head is connected with the inner wall sealing ground of described large piston, described valve piston connecting portion is connected with described little pallet, be provided with valve piston decline oil-feed space between described valve piston connecting portion and the inwall of described oil cylinder, described valve piston decline oilhole is communicated with described valve piston decline oil-feed space.

4. hydraulic type multiple range superposed force Standard Machine according to claim 3, it is characterized in that, the bottom of described valve piston and/or described large piston is provided with elastic component.