Handheld contact type roughness instrument with probe protection structure

Abstract

The utility model relates to the field of roughness instruments, and discloses a handheld contact type roughness instrument with a probe protection structure, which comprises a roughness instrument body, a probe vertically floating at one end of the roughness instrument body and a contact pin arranged at the lower end of the probe, and the probe protection structure is arranged at one end of the roughness instrument body. The probe protection structure comprises a protection cover arranged outside the probe in a covering mode, a receding groove for the probe to float up and down is formed in the protection cover, an inclined face which is in a splayed shape and is attached to the pipe shaft part at the same time is formed between the bottom of the protection cover and the bottom of the receding groove, and the lower end of the protection cover is provided with a reference plane used for abutting against the plane. The reference plane is connected with the inclined planes, the lower end of the abdicating groove is provided with an opening for the probe to extend to the position between the inclined planes, the opening is lower than or equal to the bottom of the roughmeter body, the contact pin extends out of the reference plane from the abdicating groove when not stressed, the measurement applicability of the roughmeter is improved, and the probe collision probability is remarkably reduced.

Description

Technical Field

[0001] The utility model relates to the field of roughness meters, in particular to a handheld contact roughness meter with a probe protection structure. Background Art

[0002] At present, the commonly used methods for detecting the surface roughness of objects can be divided into contact measurement and non-contact measurement. Contact measurement means that the detection part of the measuring device directly contacts the surface of the object and directly reflects the information of the measured surface.

[0003] The stylus method is a contact measurement method. The structure can be referred to Figure 1 As shown, a very sharp stylus is placed vertically on the surface to be measured and moved horizontally. The stylus will move vertically with the contour of the surface to be measured. This tiny displacement is converted into an electrical signal through a circuit and amplified and processed to obtain the working surface roughness parameter value.

[0004] Due to the production site environment and the need for mobile measurement, there are many small handheld contact roughness meters on the market. They are small, easy to carry, and can be handheld for measurement. They are widely used in production sites and metrology rooms. However, the four sides of the stylus of the handheld contact roughness meters on the market are exposed to the air. Due to the complex on-site environment, the stylus may be damaged by collision if the user makes improper operation. In addition, the existing stylus cannot determine the placement reference when measuring pipe shaft parts with arc surfaces, which will cause measurement errors due to unstable placement. Utility Model Content

[0005] The utility model aims at the shortcomings of the prior art handheld contact roughness meter that cannot accurately measure the roughness value of pipe and shaft parts and the stylus is easy to bump, and provides a handheld contact roughness meter with a probe protection structure, which can measure plane parts and pipe and shaft parts and reduce the probability of the stylus bumping.

[0006] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0007] A handheld contact roughness meter with a probe protection structure comprises a roughness meter body, a probe vertically floatingly arranged at one end of the roughness meter body, and a stylus arranged at the lower end of the probe. A probe protection structure is arranged at one end of the roughness meter body, the probe protection structure comprises a protective cover arranged outside the probe and fixed to the roughness meter body, a clearance groove for allowing the probe to float up and down is arranged inside the protective cover, an inclined surface in the shape of "eight" and simultaneously fitted with pipe shaft parts is formed between the bottom of the protective cover and the bottom of the clearance groove, a reference plane for abutting against a plane is arranged at the lower end of the protective cover, the reference plane is connected with the inclined surface, an opening is arranged at the lower end of the clearance groove for allowing the probe to extend between the inclined surfaces, the opening is lower than or equal to the bottom of the roughness meter body, and the stylus extends from the clearance groove to outside the reference plane when no force is applied.

[0008] By adopting the above scheme, a probe protection structure is added to the handheld contact roughness meter, the probe protection structure includes a protective cover, a clearance groove is provided inside the protective cover, and an "eight"-shaped inclined surface is formed between the protective cover and the bottom of the clearance groove. The opening height between the clearance groove and the inclined surface is lower than or equal to the bottom of the roughness meter body to ensure that the bottom of the roughness meter body will not interfere with the simultaneous fitting of pipe shaft parts of different sizes with both sides of the "eight"-shaped inclined surface, ensuring that a stable reference can be formed. The operator holds the roughness meter body and keeps the "eight"-shaped inclined surface tangent to the pipe shaft parts to move, and the roughness of the surface of the pipe shaft parts can be accurately measured; when the reference plane connected to the inclined surface contacts with a flat product, the operator holds the roughness meter body and moves, and the flat product can be accurately measured, and the applicability is improved. In addition, the protective cover is arranged outside the probe, and except for the detection surface, the remaining surfaces can resist accidental contact with foreign objects, which significantly reduces the probability of probe collision.

[0009] Preferably, the protective cover and the roughness meter body are fixedly connected via a detachable structure.

[0010] By adopting the above solution, the protective cover can be detachably arranged on the roughness meter body, and the protective cover can be replaced.

[0011] Preferably, the detachable structure includes threaded holes arranged on both sides of the probe on the protective cover, mounting blocks extending vertically on both sides of the protective cover at one end close to the roughness meter body and having through holes, and locking screws passing through the through holes and tightly fitting with the threaded holes.

[0012] By adopting the above scheme, the locking screw and the threaded hole are assembled, which is convenient for disassembly and assembly.

[0013] Preferably, the reference plane is located at the bottom of the mounting block.

[0014] By adopting the above scheme, when the reference plane is set at the bottom of the mounting block, the "eight"-shaped inclined surface can transition from the protective cover to the mounting block, and can adapt to pipe shaft parts of more sizes.

[0015] Preferably, the end of the clearance groove away from the roughness meter body is a blind groove, and the probe is clearance-matched with the end of the clearance groove away from the mounting block.

[0016] Preferably, the end of the clearance groove away from the roughness meter body is slotted, and the probe does not extend beyond the end of the clearance groove away from the mounting block and is in clearance fit with the end.

[0017] With the above solution, the blind groove has better protection than the open groove, but it is more difficult to produce.

[0018] The utility model has significant technical effects due to the adoption of the above technical scheme: a probe protection structure is added to the handheld contact roughness meter, the probe protection structure includes a protective cover, a clearance groove is provided inside the protective cover, and an "eight"-shaped inclined surface is formed between the protective cover and the bottom of the clearance groove, and the opening height between the clearance groove and the inclined surface is lower than or equal to the bottom of the roughness meter body to ensure that the bottom of the roughness meter body will not interfere with the simultaneous fitting of pipe shaft parts of different sizes with both sides of the "eight"-shaped inclined surface, so as to ensure that a stable reference can be formed, and an operator holds the roughness meter body and keeps the "eight"-shaped inclined surface tangent to the pipe shaft parts to move, so as to accurately measure the roughness of the surface of the pipe shaft parts; when the reference plane connected with the inclined surface contacts with a plane product, the operator holds the roughness meter body and moves, so as to accurately measure the plane product, and the applicability is improved, and the protective cover is arranged outside the probe, and except for the detection surface, the remaining surfaces can resist the accidental contact of foreign objects, so as to significantly reduce the probability of the probe bumping. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is an axonometric view of an existing handheld contact roughness tester;

[0020] Figure 2 is an axonometric diagram of a handheld contact roughness meter with a probe protection structure according to the present embodiment;

[0021] Figure 3 It is an axonometric view of the probe protection structure of this embodiment.

[0022] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. roughness meter body; 11. probe; 111. stylus; 12. threaded hole; 2. protective cover; 21. opening; 22. reference plane; 23. inclined surface; 24. through hole; 25. clearance groove; 26. mounting block. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0024] Example

[0025] A handheld contact roughness tester with a probe protection structure, referring to Figure 1 to Figure 3 As shown, it includes a roughness meter body 1, at one end of which a waist-shaped groove is arranged, from which a probe 11 that can float vertically relative to the waist-shaped groove extends through the waist-shaped groove in the roughness meter body, and at the lower end of the probe 11 a stylus 111 is arranged. The above is the prior art.

[0026] A probe protection structure is provided at one end of the roughness meter body 1. The probe protection structure includes a protective cover 2 which is arranged outside the probe 11 and fixed to the roughness meter body 1. A clearance groove 25 for the probe 11 to float up and down is provided inside the protective cover 2. The end of the clearance groove 25 away from the roughness meter body 1 is a blind groove or a slot. In order to facilitate processing, the present embodiment adopts a slotted setting method. The probe 11 does not exceed the end of the clearance groove 25 away from the mounting block 26 and is gap-matched with the end. An inclined surface 23 in an "eight" shape and simultaneously fitted with pipe shaft parts is formed between the bottom of the protective cover 2 and the bottom of the clearance groove 25. A reference plane 22 for abutting against a plane is provided at the lower end of the protective cover 2. The reference plane 22 is connected with the inclined surface 23. An opening 21 for the probe 11 to extend between the inclined surfaces 23 is provided at the lower end of the clearance groove 25. The opening 21 is lower than or equal to the bottom of the roughness meter body 1. The stylus 111 extends from the clearance groove 25 to the outside of the reference plane 22 when no force is applied.

[0027] The protective cover 2 and the roughness meter body 1 are fixedly connected by a detachable structure, which includes threaded holes 12 symmetrically arranged on both sides of the probe 11 on the protective cover 2, mounting blocks 26 vertically extending at one end close to the roughness meter body 1 on both sides of the protective cover 2 and having through holes 24, and locking screws passing through the through holes 24 and tightly fitting with the threaded holes 12, and the reference plane 22 is located at the bottom of the mounting block 26.

[0028] The process of detecting planar parts is as follows: place the handheld contact roughness meter on the planar part, the reference plane 2 on the protective cover 2 contacts the planar part, the probe 11 directly contacts the planar part, and as the roughness meter body 1 moves, the stylus 111 contacts the planar part and detects the roughness of the product surface.

[0029] The process of detecting pipe shaft parts is as follows: place a handheld contact roughness tester on the pipe shaft parts, both sides of the "eight" shaped inclined surface 23 of the protective cover 2 are in contact with the outer wall of the pipe shaft parts at the same time, and the probe 11 directly contacts the outer wall of the pipe shaft parts. As the roughness tester body 1 moves, the stylus 111 contacts the pipe shaft parts and detects the roughness of the product surface.

[0030] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A handheld contact roughness meter with a probe protection structure, comprising a roughness meter body (1), a probe (11) vertically floatingly arranged at one end of the roughness meter body (1), and a stylus (111) arranged at the lower end of the probe (11), characterized in that: A probe protection structure is arranged at one end of the roughness meter body (1), and the probe protection structure comprises a protection cover (2) which is arranged outside the probe (11) and fixed to the roughness meter body (1); a clearance groove (25) is arranged inside the protection cover (2) for the probe (11) to float up and down; an inclined surface (23) in the shape of an "eight" and in contact with a pipe shaft part is formed between the bottom of the protection cover (2) and the bottom of the clearance groove (25); a reference plane (22) for contacting with a plane is arranged at the lower end of the protection cover (2); the reference plane (22) is connected to the inclined surface (23); an opening (21) is arranged at the lower end of the clearance groove (25) for the probe to extend between the inclined surfaces; the opening (21) is lower than or equal to the bottom of the roughness meter body (1); and the stylus extends from the clearance groove (25) to the outside of the reference plane (22) when no force is applied.

2. A handheld contact roughness tester with a probe protection structure according to claim 1, characterized in that: The protective cover (2) and the roughness meter body (1) are fixedly connected via a detachable structure.

3. A handheld contact roughness tester with a probe protection structure according to claim 2, characterized in that: The detachable structure comprises threaded holes (12) arranged on both sides of the probe (11) on the protective cover (2), mounting blocks (26) extending vertically from one end of the two sides of the protective cover (2) close to the roughness meter body (1) and having through holes (24), and locking screws passing through the through holes (24) and tightly fitting with the threaded holes (12).

4. A handheld contact roughness tester with a probe protection structure according to claim 3, characterized in that: The reference plane (22) is located at the bottom of the mounting block (26).

5. The handheld contact roughness tester with a probe protection structure according to claim 3, characterized in that: The end of the clearance groove (25) away from the roughness meter body (1) is a blind groove, and the probe (11) is loosely matched with the end of the clearance groove (25) away from the mounting block (26).

6. The handheld contact roughness tester with a probe protection structure according to claim 3, characterized in that: The end of the clearance groove (25) away from the roughness meter body (1) is a slot, and the probe (11) does not exceed the end of the clearance groove (25) away from the mounting block (26) and is in clearance fit with the end.

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