Pressure head of compression testing machine

Abstract

The utility model discloses a compression resistance testing machine pressure head, which comprises a leveling seat and a ball cup, the center of the bottom of the leveling seat is sleeved with a self-aligning hemispherical cavity, the center of the top of the ball cup is nested with a hemispherical head matched with the self-aligning hemispherical cavity, and when the leveling seat and the ball cup are assembled, an avoiding space is formed between the leveling seat and the ball cup. According to the utility model, the self-aligning hemispherical cavity and the leveling seat are detachably arranged, and the hemispherical head and the ball head seat are detachably arranged, so that after long-time use, maintenance and replacement are convenient, and the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to a pressure testing device, in particular to a pressure head of a compression testing machine. Background Art

[0002] The surfaces of mortar specimens, concrete specimens, concrete core samples, rock core samples, etc. that need to undergo compressive strength tests usually have flatness deviations and protruding particles. When the pressure head of the pressure testing machine conducts a compressive test on them, the upper and lower surfaces of the specimens are not parallel or there are some protrusions, which causes uneven force on the specimens and causes overload. During the test, the specimens may be damaged on one side, affecting the accuracy of the measured pressure value.

[0003] The utility model patent with publication number CN 217466453 U discloses a test pressure head of a pressure testing equipment, including a leveling seat and a ball head seat, a hemispherical head is integrally installed in the middle of the ball head seat, and a centering hemispherical cavity is integrally opened in the middle of the leveling seat. The integrally arranged hemispherical head and ball head seat are not easy to replace. Utility Model Content

[0004] Purpose of the utility model: The purpose of the utility model is to provide a pressure head of a compression testing machine which is easy to replace and reduces maintenance costs.

[0005] Technical solution: The utility model describes a pressure head of a compression testing machine, comprising a leveling seat and a ball head seat, wherein a center sleeve at the bottom of the leveling seat is provided with a self-aligning hemispherical cavity, and a hemispherical head matching the self-aligning hemispherical cavity is nested at the top center of the ball head seat, and when the leveling seat and the ball head seat are assembled, an avoidance space is formed between the leveling seat and the ball head seat.

[0006] In the utility model, the self-aligning hemispherical cavity and the leveling seat, the hemispherical head and the ball head seat are all detachably arranged, which is convenient for maintenance and replacement after long-term use, thus helping to reduce maintenance costs.

[0007] Preferably, the radii of the self-aligning hemispherical cavity and the hemispherical head are consistent, and a polymer wear-resistant material layer is provided between the two. The polymer wear-resistant material is PTFE.

[0008] Preferably, a groove with a radius greater than that of the leveling seat is provided at the top of the ball head seat, and the bottom of the leveling seat extends into the groove to form an escape space.

[0009] Preferably, the leveling seat and the ball head seat are connected via a leveling screw, and a spring is sleeved on one end of the leveling screw away from the ball head seat.

[0010] Preferably, the leveling seat is provided with a through hole for installing a leveling screw, and the adjusting screw passes through the through hole and is connected to the ball head seat.

[0011] Preferably, a connecting screw is provided on the top of the leveling seat.

[0012] Preferably, the hemispherical head and the center of the self-aligning hemispherical cavity are provided with a cylindrical hole, which is used to reduce the contact area between the hemispherical head and the self-aligning hemispherical cavity, reduce material consumption, and reduce processing volume.

[0013] Beneficial effects: Compared with the prior art, the utility model has the following advantages: 1. Easy maintenance and replacement: the leveling hemispherical cavity and the leveling seat, the hemispherical head and the ball head seat are all detachable, which is convenient for replacement and reduces the maintenance cost after wear; 2. Extended service life: a polymer wear-resistant material is arranged between the leveling hemispherical cavity and the hemispherical head to reduce friction; 3. Easy leveling: the leveling hemispherical cavity and the hemispherical head are relatively movable, and can automatically find the appropriate angle during testing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a front view of the pressure head structure of the utility model;

[0015] Figure 2 It is a top view of the pressure head structure of the utility model;

[0016] Figure 3 This is a front cross-sectional view of the pressure head structure of the utility model. DETAILED DESCRIPTION

[0017] The technical solution of the utility model is further described below in conjunction with the accompanying drawings.

[0018] like Figures 1 to 3 As shown, it is the structural diagram and the main cross-sectional view of the pressure head of the compression testing machine. From top to bottom, they are the connecting screws 8, the leveling seat 3, and the ball head seat 4. The whole device is installed and used with the external structure through the connecting screws 8.

[0019] The bottom of the leveling seat 3 extends outward to form a boss, and the inner center is sleeved with a self-aligning hemispherical cavity 2. A hemispherical head 1 is embedded in the center of the top of the ball head seat 4, and a circular groove is formed. The hemispherical head 1 is concentrically arranged with the groove. The radius of the self-aligning hemispherical cavity 2 and the hemispherical head 1 are consistent. During installation, the self-aligning hemispherical cavity 2 of the leveling seat 3 is snapped onto the hemispherical head 1, and the bottom is extended into the groove. The bottom extension length of the leveling seat 3 is less than the groove height, and the boss radius is less than the groove radius, so as to form an avoidance space, and an upper pressure plate is formed at the bottom of the ball head seat 4. During the test, when the upper pressure plate contacts the test block, the upper pressure plate will rotate and level with the deviation of the test block surface.

[0020] A polymer wear-resistant material layer 5 is provided between the self-aligning hemispherical cavity 2 and the hemispherical head 1, and the polymer wear-resistant material is PTFE. The boss of the leveling seat 3 is provided with through holes in a circumferential array, and the leveling seat 3 and the ball head seat 4 are connected by a leveling screw 9, which is installed in the through hole, and a spring is sleeved on the top of the leveling screw 9, and a gasket 7 is installed between the spring and the through hole. A cylindrical hole is provided at the axis of the hemispherical head 1 and the self-aligning hemispherical cavity 2, and the cylindrical hole is arranged along the axis of the hemispherical head 1 and the self-aligning hemispherical cavity 2, which is used to reduce the contact area between the hemispherical head and the self-aligning hemispherical cavity, reduce material consumption, and reduce processing volume.

Claims

1. A compression testing machine pressure head, comprising a leveling seat (3) and a ball head seat (4), characterized in that: The center of the bottom of the leveling seat (3) is sleeved with a centering hemispherical cavity (2), and the center of the top of the ball head seat (4) is nested with a hemispherical head (1) that matches the centering hemispherical cavity. When the leveling seat and the ball head seat are assembled, an escape space is formed between the leveling seat and the ball head seat.

2. The compression testing machine pressure head according to claim 1, characterized in that: The radii of the self-aligning hemispherical cavity (2) and the hemispherical head (1) are consistent, and a polymer wear-resistant material layer (5) is provided between the two.

3. The compression testing machine pressure head according to claim 1, characterized in that: The top of the ball head seat (4) is provided with a groove whose radius is greater than the radius of the leveling seat (3), and the bottom of the leveling seat (3) extends into the groove to form an escape space.

4. The compression testing machine pressure head according to claim 1, characterized in that: The leveling seat (3) and the ball head seat (4) are connected via a leveling screw (9), and a spring is sleeved on one end of the leveling screw away from the ball head seat.

5. The compression testing machine pressure head according to claim 4, characterized in that: The leveling seat (3) is provided with a through hole for installing a leveling screw.

6. The compression testing machine pressure head according to claim 1, characterized in that: A connecting screw (8) is provided on the top of the leveling seat (3).

7. The compression testing machine pressure head according to claim 1, characterized in that: The center of the self-aligning hemispherical cavity (2) and the hemispherical head (1) is provided with a cylindrical hole.

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