Measuring device for rapidly measuring height of center of sphere of pressure plate

Abstract

The utility model relates to a detection tool, in particular to a measuring device for quickly measuring the height of the center of sphere of a pressure plate. Comprising a measuring support, a measuring rod and a base. A limiting seat is arranged on the base; the measuring support is arranged above the limiting seat in a spanning manner and is fixed on the base; the upper end of the measuring rod penetrates through the measuring support and is in sliding fit with the measuring support, and the lower end of the measuring rod is a ball head detection end; the axis of the measuring rod coincides with the axis of the limiting seat. The measuring device for quickly measuring the height of the ball center of the pressure plate has the advantages of simple structure, high measuring efficiency and accuracy.

Description

Technical Field

[0001] The utility model relates to a detection tool, in particular to a measuring device for quickly measuring the height of a ball center of a pressure plate. Background Art

[0002] In the straight axis plunger pump, the ball pressure assembly 7 is the core component. Figure 1 , 2 As shown, a pair of friction pairs are formed by the pressure plate 7-1 and the ball joint 7-2, and the ball joint 7-2 is located in the ball socket 7-11 of the pressure plate. Since the ball pressure assembly 7 works under high pressure and high speed, in order to prevent the risk of early wear and failure of the pressure plate 7-1 and the ball joint 7-2 during operation, in addition to having special requirements on the materials, heat treatment, dimensions, roughness, shape and position tolerances of the two parts during the design process, how to ensure and detect unqualified parts in the assembly during the processing process is also a major problem that needs to be solved urgently. Among them, in the ball pressure assembly 7, the ball center height dimension H1 of the pressure plate is also an extremely important dimension in the ball pressure assembly. If H1 is larger than the standard size, the volumetric efficiency of the hydraulic pump will be reduced, and there is even a risk of failure to work; if H1 is smaller than the standard size, the friction pair of the ball pressure assembly 7 will be at risk of early failure, thereby reducing the service life of the hydraulic pump.

[0003] At present, the center height of the pressure plate is mainly processed by forming knives. The center height size is indicated in the process and guaranteed during the processing. Therefore, the center height size of the pressure plate after processing is not checked accordingly. However, the tool will wear during the processing, which will cause the size of the center height of the pressure plate to be out of tolerance during the processing.

[0004] If the ball center height of the pressure plate is measured by a three-coordinate measuring instrument, firstly, the position and number of points collected each time are different, which will inevitably lead to inaccurate measurement; secondly, if each pressure plate is measured by a three-coordinate measuring instrument, the whole measurement process will take too long due to the measurement of the three-coordinate measuring instrument itself, occupying the public resources of other parts measured by the three-coordinate measuring instrument; finally, due to the large customer demand for the ball pressure assembly 7, the efficiency of the three-coordinate measuring instrument cannot meet the demand. It can be seen that the three-coordinate measuring instrument is only suitable for partial sampling of the pressure plate, so it is necessary to design a special measuring device to meet the needs of large-scale testing of enterprises. Utility Model Content

[0005] The axial clearance between the pressure plate and the ball joint will be affected by the over-tolerance of the pressure plate ball center height. Figure 1 As shown, the oil film between the pressure plate and the ball joint is affected, and the life of the plunger pump is affected. The utility model is intended to provide a measuring device for quickly measuring the height of the ball center of the pressure plate, which has the advantages of simple structure, high measurement efficiency and accuracy.

[0006] A measuring device for quickly measuring the spherical center height of a pressing plate in this solution includes a measuring support, a measuring rod, and a base. A limit seat for supporting and limiting the measured part is provided on the base; the measuring support is straddled above the limit seat and fixed to the base to facilitate the insertion and removal of the measured part; the upper end of the measuring rod passes through the measuring support and is slidably matched with it; the lower end of the measuring rod is a spherical head detection end, that is, the spherical head detection end is directly integrally processed at one end of the measuring rod; the axis of the measuring rod coincides with the axis of the limit seat.

[0007] The advantages of the present utility model are as follows: 1) It avoids the situation that the measurement of the spherical center height is inaccurate due to inconsistent positions and numbers of points collected by the three-coordinate measuring instrument; 2) Since the spherical head detection end is directly integrally processed at one end of the measuring rod, it avoids the positioning error of split processing, as well as the processing error and assembly error at the connection between the measuring rod and the spherical head detection end, and has a high detection accuracy; 3) It avoids excessive occupation of the common resources of the three-coordinate measuring instrument, saves the measuring time for processing other parts, and improves the processing efficiency of other parts; 4) By understanding the wear condition of the cutting tool through the detection data, the cutting tool can be updated in time to avoid the generation of defective products and reduce the defective rate; 5) It improves the detection efficiency of the spherical center height dimension of the pressing plate.

[0008] Furthermore, the measuring support includes a support part and a measuring bushing integrally provided. The support part is an inverted U-shaped structure, which has stable support, is easy to fix the measuring support on the base, and is convenient for the insertion and removal of the measured part. The upper end of the measuring rod passes through the measuring bushing and is slidably matched with it.

[0009] Still further, a stop end and a through end are provided at the upper end of the measuring bushing, and the stop end is higher than the through end. The height difference between the stop end and the through end is less than the tolerance value of the spherical center height dimension.

[0010] Even further, a relief groove is provided between the stop end and the through end to facilitate the processing of the stop end and the through end.

[0011] Still further, a limiting member is further included. A limiting groove adapted to it is provided on the measuring rod. The limiting member passes through the measuring bushing and extends into the limiting groove to limit the displacement of the measuring rod. Preferably, the limiting member is a limiting screw or a limiting pin. When the measuring rod is at the lowest position, the upper end of the measuring rod is lower than the through end; when the measuring rod is at the highest position, the upper end of the measuring rod is higher than the stop end.

[0012] Furthermore, a display part is further included. The display part is fixed on the measuring support and is used to display whether the detected pressing plate is qualified.

[0013] Furthermore, the base and the limit seat are of an integral structure, which avoids the processing error and assembly error at the connection between the base and the limit seat and further improves the detection accuracy. Description of the Drawings

[0014] Figure 1 Schematic structural diagram of the ball pressure assembly;

[0015] Figure 2 Schematic structural diagram of the pressure plate;

[0016] Figure 3 Schematic structural diagram of a measuring device for quickly measuring the ball center height of a pressure plate according to the present utility model;

[0017] Figure 4 Front and top views of the measuring support in a measuring device for quickly measuring the ball center height of a pressure plate according to the present utility model;

[0018] Figure 5 Schematic diagram of the measuring rod in a measuring device for quickly measuring the ball center height of a pressure plate according to the present utility model.

[0019] In the figure, 1 is the limit seat, 1-1 is the limit hole, 2 is the measuring support, 2-1 is the support part, 2-2 is the measuring bushing, 2-3 is the stop end, 2-4 is the through end, 2-5 is the relief groove, 3 is the measuring rod, 3-1 is the upper end of the measuring rod, 3-2 is the ball head detection end, 3-3 is the limit groove, 4 is the base, 5 is the limiting member, 7 is the ball pressure assembly, 7-1 is the pressure plate, 7-11 is the ball socket, 7-2 is the ball hinge, H1 is the ball center height dimension, and H2 is the height difference between the stop end and the through end. Specific embodiments

[0020] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0021] According to Figure 1 As shown, if the ball center height dimension H1 of the workpiece to be measured (pressure plate 7-1) is out of tolerance, it will affect the axial clearance between the pressure plate and the ball hinge 7-2, thereby affecting the establishment of the oil film between the two, and further affecting the service life of the plunger pump. At the same time, to shorten the measurement time of the pressure plate and avoid affecting its processing and production efficiency, it will further fail to meet the requirements of large-scale production of enterprises.

[0022] A measuring device for quickly measuring the ball center height of the pressure plate 7-1 in this solution, according to Figure 3 As shown, includes a measuring support 2, a measuring rod 3, and a base 4. A limit seat 1 is provided on the base 4, and the measuring support 2 straddles above the limit seat 1 and is fixed to the base 4. Specifically, the limit seat 1 has a limit hole 1-1, which can be a blind hole or a through hole, and the inner diameter of the limit hole 1-1 is adapted to the protruding end of the workpiece to be measured (pressure plate 7-1); there is a certain distance between the measuring support 2 and the limit seat 1 for the workpiece to be measured (pressure plate 7-1) to be inserted and removed. According to Figure 5As shown, the upper end 3-1 of the measuring rod passes through the measuring support 2 and is in sliding fit with it; the lower end of the measuring rod 3 is a spherical head detection end 3-2, that is, the spherical head detection end 3-2 is directly machined and formed at one end of the measuring rod 3; the axis of the measuring rod 3 coincides with the axis of the limiting hole 1-1 on the limiting seat 1. The spherical head diameter of the spherical head detection end 3-2 is the standard size required for detection.

[0023] As a further improvement of the present utility model, according to Figure 4 As shown, the measuring support 2 includes a support part 2-1 and a measuring bushing 2-2 which are integrally arranged. Preferably, the support part 2-1 is an inverted U-shaped structure; the upper end 3-1 of the measuring rod passes through the measuring bushing 2-2 and is in sliding fit with it. Specifically, the inner hole of the measuring bushing 2-2 and the outer circle of the measuring rod 3 are assembled by means of clearance fit.

[0024] As a further improvement of the present utility model, the upper end of the measuring bushing 2-2 is provided with a stop end 2-3 and a through end 2-4, and the stop end 2-3 is higher than the through end 2-4. According to Figure 3 、 4 As shown, the height difference dimension H2 between the stop end and the through end is smaller than the spherical center height dimension H1 of the measured part (press plate 7-1). In this embodiment, the spherical center height dimension H1 of the measured part (press plate 7-1) = L1 ± 0.05. Preferably, the height difference H2 between the stop end and the through end = L1 ± 0.003.

[0025] As a further improvement of the present utility model, a relief groove 2-5 is provided between the stop end 2-3 and the through end 2-4, which is convenient for machining the end faces of the stop end 2-3 and the through end 2-4.

[0026] As a further improvement of the present utility model, it further includes a limiting member 5. According to Figure 3 、 5 As shown, the measuring rod 3 is provided with a limiting groove 3-3 adapted to it, and the limiting member 5 passes through the measuring bushing 2-2 and extends into the limiting groove 3-3. It is used to limit the displacement of the measuring rod 3. In this embodiment, the limiting member 5 is preferably a limiting screw. When the measuring rod 3 is at the lowest position, the upper end 3-1 of the measuring rod is lower than the through end 2-4; when the measuring rod 3 is at the highest position, the upper end 3-1 of the measuring rod is higher than the stop end 2-3.

[0027] As a further improvement of the present utility model, it further includes a display part, and the display part is fixed on the measuring support 2. It is used to display whether the detected press plate 7-1 is qualified. Preferably, the display part is a digital display micrometer, and the probe of the digital display micrometer abuts against the upper end 3-1 of the measuring rod. In this way, it can be determined whether the measured part (press plate 7-1) is qualified through the digital display micrometer; and when the measured part is qualified, whether the upper end 3-1 of the measuring rod is closer to the through end 2-4 or closer to the stop end 2-3.

[0028] As a further improvement of the present utility model, the base 4 and the limit seat 1 are of an integral structure, which avoids the machining error and assembly error at the connection between the base 4 and the limit seat 1, and further improves the detection accuracy.

[0029] During use, first place the pressing plate 7-1 on the limit seat 1, and place the protruding end of the pressing plate 7-1 into the limit hole 1-1. At this time, the center of the ball socket 7-11 is located on the axis of the limit hole 1-1 to achieve the support and limitation of the pressing plate 7-1 and complete the clamping of the pressing plate 7-1. Then lower the measuring rod 3 until its spherical head detection end 3-2 is in close contact with the ball socket 7-11 of the pressing plate 7-1 to completely position the pressing plate 7-1. At this time, if the upper end 3-1 of the measuring rod is between the through end 2-4 and the non-through end 2-3, according to Figure 3 as shown, at this time, the spherical center height dimension H1 of the pressing plate 7-1 is determined to be qualified; if the upper end 3-1 of the measuring rod is below the through end 2-4 or above the non-through end 2-3, then the spherical center height dimension H1 of the pressing plate 7-1 is determined to be unqualified. The position of the upper end 3-1 of the measuring rod can be assisted in determination by using a feeler gauge or a fingernail.

[0030] When measuring the spherical center height dimension of the pressing plate 7-1 with a three-coordinate measuring instrument, the time consumed for each piece is 2 min 30 s. However, when using the present utility model to measure the spherical center height dimension of the pressing plate 7-1, the time consumed for each piece is only 10 - 15 s. It can be seen that the present utility model greatly saves time, improves the detection efficiency of the pressing plate 7-1, and does not affect the pressing plate 7-1 from entering the next processing step.

[0031] When the upper end 3-1 of the measuring rod is between the through end 2-4 and the non-through end 2-3, but the upper end 3-1 of the measuring rod is close to the non-through end 2-3, it is necessary to timely check the wear condition of the cutting tool, or adjust the position of the cutting tool, or replace with a new cutting tool, so as to avoid the spherical center height dimension of the pressing plate 7-1 exceeding the tolerance during the processing due to the wear of the cutting tool.

[0032] In this embodiment, the base 4 and the limit seat 1, and the support part 2-1 and the measuring bushing 2-2 can all be integrally processed, which avoids the error caused by multiple positioning in the case of split processing, as well as the machining error and assembly error at the connection between the two, and ensures that the present utility model has a high detection accuracy.

[0033] The above are only the embodiments of the present utility model. Common general knowledge such as specific structures and characteristics in the solutions is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present utility model, several deformations and improvements can still be made, and these should also be regarded as the protection scope of the present utility model, and these will not affect the implementation effect of the present utility model and the practicality of the patent.

Claims

1. A measuring device for quickly measuring the center height of a pressure plate, characterized in that: It includes a measuring support, a measuring rod and a base; a limit seat is provided on the base; the measuring support is straddled above the limit seat and fixed on the base; the upper end of the measuring rod passes through the measuring support and slidably cooperates with the measuring support, and the lower end of the measuring rod is a ball head detection end; the axis of the measuring rod coincides with the axis of the limit seat.

2. A measuring device for quickly measuring the center height of a pressing plate according to claim 1, characterized in that: The measuring support comprises a supporting portion and a measuring bushing, wherein the supporting portion is an inverted U-shaped structure; the upper end of the measuring rod passes through the measuring bushing and is slidably matched therewith.

3. A measuring device for quickly measuring the center height of a pressing plate according to claim 2, characterized in that: The upper end of the measuring bushing is provided with a stop end and a through end, and the stop end is higher than the through end.

4. A measuring device for quickly measuring the center height of a pressing plate according to claim 3, characterized in that: A clearance groove is arranged between the stop end and the through end.

5. The measuring device for quickly measuring the center height of a pressing plate according to claim 2, characterized in that: It also includes a limiting piece. The measuring rod is provided with a limiting groove adapted thereto. The limiting piece passes through the measuring bushing and extends into the limiting groove.

6. A measuring device for quickly measuring the center height of a pressing plate according to claim 1 or 2, characterized in that: It also includes a display part, which is fixed on the measuring support.

7. The measuring device for quickly measuring the center height of a pressing plate according to claim 1, characterized in that: The base and the limiting seat are an integrated structure.

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