Auxiliary measuring clamp for internal thread workpiece

Abstract

The invention discloses an auxiliary measuring fixture for an internal thread workpiece, which comprises a mounting seat detachably connected to a bottom table of a thread measuring instrument, the bottom of the mounting seat is provided with an air pressure expansion head, and the bottom table is provided with a connecting hole for inserting the air pressure expansion head; the base is fixed on one side face of the mounting seat, a center hole is formed in the base, dovetail grooves are obliquely formed in the two sides of the bottom, corresponding to the center hole, of the base, and a first measuring head groove and a second measuring head groove for allowing a measuring head of a measuring instrument to be inserted are formed in the top and the bottom, corresponding to the center hole, of the base; the pressing plate assembly is connected to the dovetail groove in a sliding mode, and a pressing head of the pressing plate assembly abuts against and is fixed to a to-be-measured thread workpiece on the base. The thread parameter measuring device is simple in structure and can be used in cooperation with a thread comprehensive measuring instrument, and thread parameter measurement can be rapidly and efficiently completed.

Description

Technical Field

[0001] The invention belongs to the technical field of threaded workpiece measuring equipment, and in particular relates to an auxiliary measuring fixture for internal threaded workpieces. Background Art

[0002] Thread is a special structure used for connection and transmission. It is easy to assemble and can decompose complex mechanical parts into several relatively simple geometric components, thus greatly improving the processability and quality of mechanical equipment manufacturing. Thread is also detachable, so that people can easily repair equipment and replace parts. Therefore, thread is widely used in the field of mechanical manufacturing. Thread connection is one of the most commonly used, simplest and most effective connection forms in mechanical connection.

[0003] To ensure the reliability of threaded connections and the sealing and anti-loosening properties of threaded parts, it is necessary to measure their geometric parameters, which are directly related to the connection, assembly and maintenance of threaded parts. The geometric parameters of threads include major diameter, minor diameter, middle diameter, pitch, tooth angle, etc. Among them, the middle diameter, pitch and tooth angle are generally referred to as the three elements of threads in the industry.

[0004] There are many methods for measuring internal thread parameters, including go / no-go gauge measurement, special instrument measurement, etc. Among them, the thread comprehensive measuring instrument is the most powerful method. However, the thread measuring instrument is a laboratory measuring equipment with a relatively small measuring table, which makes it impossible to clamp and measure some special-shaped threaded parts.

[0005] Therefore, how to provide an auxiliary measurement fixture for internal threaded parts to improve measurement efficiency is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0006] In view of this, the present invention provides an auxiliary measuring fixture for internal threaded parts, which assists in clamping internal threaded parts and can cooperate with a thread measuring instrument to quickly measure thread parameters.

[0007] In order to achieve the above object, the present invention adopts the following technical solution: an auxiliary measuring fixture for internal threaded parts, comprising:

[0008] A mounting seat, the mounting seat is detachably connected to the bottom platform of the thread measuring instrument, a pneumatic expansion head is provided at the bottom of the mounting seat, and a connecting hole for inserting the pneumatic expansion head is provided on the bottom platform;

[0009] A base, the base is fixed on one side of the mounting base, the base is provided with a center hole, dovetail grooves are obliquely arranged on both sides of the bottom of the base corresponding to the center hole, and the top and bottom of the base corresponding to the center hole are provided with a first probe slot and a second probe slot for inserting a probe of a measuring instrument;

[0010] A pressing plate assembly is slidably connected to the dovetail groove and a pressing joint of the pressing plate assembly is abutted and fixed to a threaded workpiece to be tested on a base.

[0011] The beneficial effects of the present invention are as follows: the mounting seat can be detachably connected to the thread measuring instrument, and the connection with the connecting hole on the thread measuring instrument is realized by using a pneumatic expansion head. The disassembly and assembly are convenient, and only the on-off of the air circuit needs to be controlled. The clamping and fixing of the threaded workpiece to be measured is completed by using a pressure plate assembly on the base. The first probe slot and the second probe slot provide measuring space for the probe on the thread measuring instrument to complete the data measurement. The upper and lower measurement data completed by using the first probe slot and the second probe slot can improve the accuracy of thread parameter measurement.

[0012] Preferably, the mounting seat is a rectangular seat, an air path connected to the pneumatic expansion head is provided inside the mounting seat, the air path is connected to an external air source to provide compressed air, and a valve for controlling the on-off of the air path is provided on one side of the mounting seat.

[0013] The resulting technical effect is: the air circuit is used to provide compressed air to the pneumatic expansion head, the pneumatic expansion head expands and locks under the action of air pressure, and the valve controls the on-off of the air circuit.

[0014] Preferably, the base is a square base, the top edge and two side edges of the base are flush with the top edge and two side edges of the mounting base respectively, and anti-collision chamfers are provided on both sides of the top of the base and the mounting base.

[0015] The resulting technical effect is that the base and the mounting base are fixed by riveting, and to ensure that the measurement personnel do not bump into them, an anti-collision chamfer is provided on the top.

[0016] Preferably, two rows of positioning holes are provided on both sides of the top of the base corresponding to the central hole, and the two rows of positioning holes are symmetrically arranged on both sides of the central hole.

[0017] The resulting technical effect is that the center hole can preliminarily locate the threaded part to be tested, and the two rows of positioning holes are symmetrical. The distance from each pair of holes to the center of the center hole is equal, and the center of each row of positioning holes is on the same diameter. The center positioning hole can play a role in assisting the positioning of the threaded part to be tested.

[0018] Preferably, the pressure plate assembly includes a connecting block, a support rod, a crimping joint and a pressure head seat, the connecting block is adapted to be slidably connected in the dovetail groove, the support rod is fixed on the connecting block, the pressure head seat is connected to the support rod, the crimping joint is fixed on one side of the pressure head seat, and the crimping joint crimps the threaded workpiece to be tested and limits the position of the threaded workpiece to be tested on the base.

[0019] The resulting technical effect is: after the crimping head is adjusted to the appropriate position and pressed down, it can ensure that the position of the threaded workpiece to be measured does not change during the measurement process. If the threaded workpiece to be measured is large or heavy, a pressure plate assembly can be installed in each of the two dovetail grooves to fix it from two directions.

[0020] Preferably, the crimping joint is in the shape of a long arc-bent plate, and is formed of spring steel. One end of the crimping joint away from the crimping head seat abuts against the threaded workpiece to be tested.

[0021] The resulting technical effect is: when using the crimping head for crimping, the crimping head has a certain elastic deformation, and the long arc-shaped crimping head utilizes the principle of the lever fulcrum to react to the crimping head seat, thereby changing the axial direction of the crimping head seat and the support rod, and relying on the relative friction between the crimping head seat and the support rod to maintain the position limit. Normally, the crimping head can be removed from the support rod.

[0022] Preferably, there are multiple groups of pneumatic expansion heads which are respectively fixed at the bottom of the mounting seat, the pneumatic expansion heads are mushroom-shaped rubber expansion plugs, and a clamping groove for limiting the pneumatic expansion head is provided on the inner side wall of the connecting hole.

[0023] The resulting technical effect is that the mushroom-shaped expansion plug is easy to insert and is also easy to lock with the connecting hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an overall structural diagram of an auxiliary measuring fixture for an internally threaded workpiece according to the present invention;

[0025] Figure 2 This is an application diagram of an auxiliary measuring fixture for an internally threaded workpiece according to the present invention;

[0026] Figure 3 The present invention is a schematic diagram of assembling a pneumatic expansion head of an auxiliary measuring fixture for an internally threaded workpiece.

[0027] 1 mounting seat, 2 bottom platform, 3 connecting hole, 4 air pressure expansion head, 5 base, 6 center hole, 7 dovetail groove, 8 pressure plate assembly, 81 connecting block, 82 support rod, 83 pressing head, 84 pressure head seat, 9 positioning hole, 10 first measuring head slot, 11 second measuring head slot, 12 valve, 13 threaded workpiece to be measured, 14 anti-collision chamfer. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] See the attached Figures 1 to 3 According to an embodiment of the present invention, an auxiliary measuring fixture for an internally threaded workpiece comprises:

[0030] A mounting base 1, which is detachably connected to a base 2 of the thread measuring instrument, a pneumatic expansion head 4 is provided at the bottom of the mounting base 1, and a connecting hole 3 for inserting the pneumatic expansion head is provided on the base 2;

[0031] Base 5, base 5 is fixed on one side of mounting base 1, a center hole 6 is provided on base 5, dovetail grooves 7 are arranged obliquely on both sides of the bottom of base 5 corresponding to the center hole, and a first probe groove 10 and a second probe groove 11 for inserting the probe of the measuring instrument are provided on the top and bottom of base 5 corresponding to the center hole 6; thread measurement needs to be measured once from the top and bottom, in order to avoid hitting the rod or being unable to touch during the measurement process, a groove is opened on the top and bottom of base 5, which are the first probe groove 10 and the second probe groove 11, respectively, so as to ensure the smooth operation of the upper and lower probes;

[0032] The pressing plate assembly 8 is slidably connected to the dovetail groove 7 and the pressing joint 83 of the pressing plate assembly is abutted and fixed to the threaded workpiece 13 to be tested on the base 5 .

[0033] In other embodiments, the mounting seat 1 is a rectangular seat, and an air path connected to the air pressure expansion head 4 is provided inside the mounting seat 1. The air path is connected to an external air source and provides compressed air, and a valve 12 for controlling the on-off of the air path is provided on one side of the mounting seat 1. When the valve is turned on, compressed air is introduced into the air path, and when the valve is closed, no compressed air is introduced, and the air pressure expansion head is expanded by compressed air and locked with the connection hole;

[0034] Compressed air can be connected or disconnected by loosening and locking the valve. The pneumatic expansion head uses air pressure to expand it, thereby achieving a locking effect. The pneumatic expansion head is used to tightly connect the mounting base and the base together.

[0035] In other specific embodiments, the base 5 is a square base, and the top edge and two side edges of the base 5 are flush with the top edge and two side edges of the mounting base 1, respectively. Both sides of the top of the base 5 and the mounting base 1 are provided with 45° anti-collision chamfers 14 to avoid bumps during operation and protect personnel safety.

[0036] In some other embodiments, two rows of positioning holes 9 are provided on both sides of the top of the base 5 corresponding to the center hole 6. The two rows of positioning holes are symmetrically arranged on both sides of the center hole 6. The positioning holes assist in positioning the position of the threaded workpiece to be tested, and reversely assist in positioning through the positional relationship between the two rows of positioning holes and the threaded workpiece to be tested.

[0037] In some other specific embodiments, the pressure plate assembly 8 includes a connecting block 81, a support rod 82, a crimping head 83 and a pressure head seat 84. The connecting block 81 is adapted to be slidably connected in the dovetail groove 7, the support rod 82 is fixed on the connecting block 81, the pressure head seat 84 is sleeved on the support rod 82, the crimping head 83 is fixed on one side of the pressure head seat 84, the crimping head 83 abuts against the threaded workpiece 13 to be tested, and the pressure head seat can adapt to changing its position on the support rod to adapt to the clamping of threaded workpieces to be tested with different thicknesses.

[0038] The crimping joint is a long arc-bent plate structure formed of spring steel. The end of the crimping joint away from the crimping head seat abuts against the threaded workpiece to be tested. The limiting principle of the crimping joint is that when one end of the long arc-bent plate-shaped crimping joint abuts against the threaded workpiece to be tested, the crimping joint itself has a certain elastic deformation. By utilizing the principle of the lever fulcrum, it reacts to the crimping head seat, changes the axial direction of the crimping head seat and the support rod, and relies on the relative friction between the crimping head seat and the support rod to keep the position of the crimping joint on the support rod stable.

[0039] The structure of the pressure head seat is actually a ring sleeve, which can be removed from the support rod.

[0040] In other embodiments, there are two groups of pneumatic expansion heads 4 which are respectively fixed at the bottom of the mounting base 1 , the pneumatic expansion heads 4 are mushroom-shaped rubber expansion plugs, and a clamping groove for limiting the pneumatic expansion heads is provided on the inner side wall of the connecting hole 3 .

[0041] During the specific measurement, the internal thread workpiece is installed on the base and fixed with the pressure plate assembly. After tightening, it is placed on the measuring table of the thread measuring instrument, and the internal thread probe is directly used to perform contact scanning measurement on the thread parameters of the workpiece.

[0042] As for the device and the method of use disclosed in the embodiment, since they correspond to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An auxiliary measuring fixture for internal threaded parts, characterized in that: include: A mounting seat (1), the mounting seat (1) being detachably connected to a base (2) of a thread measuring instrument, a pneumatic expansion head (4) being provided at the bottom of the mounting seat (1), and a connecting hole (3) for inserting the pneumatic expansion head being provided on the base (2); A base (5), the base (5) being fixed on a side surface of the mounting base (1), the base (5) being provided with a center hole (6), dovetail grooves (7) being arranged obliquely on both sides of the bottom of the base (5) corresponding to the center hole, and a first probe groove (10) and a second probe groove (11) for inserting a probe of a measuring instrument are provided at the top and bottom of the base (5) corresponding to the center hole (6); A pressure plate assembly (8) is slidably connected to the dovetail groove (7) and a pressure joint (83) of the pressure plate assembly is abutted and fixed to a threaded component (13) to be tested on a base (5).

2. The auxiliary measuring fixture for internal threaded parts according to claim 1, characterized in that: The mounting seat (1) is a rectangular seat, and an air path connected to the air pressure expansion head (4) is provided inside the mounting seat (1), the air path is connected to an external air source and provides compressed air, and a valve (12) for controlling the on-off of the air path is provided on one side of the mounting seat (1).

3. The auxiliary measuring fixture for internal threaded parts according to claim 1, characterized in that: The base (5) is a square base, the top edge and the two side edges of the base (5) are respectively flush with the top edge and the two side edges of the mounting base (1), and both sides of the top of the base (5) and the mounting base (1) are provided with anti-collision corners (14).

4. The auxiliary measuring fixture for internal threaded parts according to claim 3, characterized in that: Two rows of positioning holes (9) are provided on both sides of the top of the base (5) corresponding to the central hole (6), and the two rows of positioning holes are symmetrically arranged on both sides of the central hole (6).

5. The auxiliary measuring fixture for internal threaded parts according to claim 1, characterized in that: The pressure plate assembly (8) comprises a connecting block (81), a support rod (82), a crimping joint (83) and a pressure head seat (84); the connecting block (81) is adapted to be slidably connected in the dovetail groove (7); the support rod (82) is fixed on the connecting block (81); the pressure head seat (84) is connected to the support rod (82); the crimping joint (83) is fixed on one side of the pressure head seat (84); the crimping joint (83) crimps the threaded component (13) to be tested and limits the position of the threaded component (13) to be tested on the base (5).

6. The auxiliary measuring fixture for internal threaded parts according to claim 5, characterized in that: The crimping joint (83) is in the shape of a long arc-bent plate and is formed of spring steel. One end of the crimping joint (83) away from the crimping head seat (84) abuts against the threaded component (13) to be tested.

7. The auxiliary measuring fixture for internal threaded parts according to claim 1, characterized in that: The pneumatic expansion heads (4) are provided in multiple groups and are respectively fixed on the bottom of the mounting seat (1); the pneumatic expansion heads (4) are mushroom-shaped rubber expansion plugs; and a clamping groove for limiting the pneumatic expansion heads is provided on the inner side wall of the connecting hole (3).

Images