Measuring head triggering device based on strain gauge

Abstract

The utility model discloses a measuring head triggering device based on strain gauges, which belongs to the technical field of online detection of numerical control machine tools and comprises a sensing ring, a plurality of strain gauges, an outer swing rod, an inner swing rod, a pressure spring, a tension spring, a shell, a plurality of screws, a measuring needle and a detection circuit. A plurality of equally distributed fulcrums extend along the circumferential direction of the outer swing rod; according to the probe triggering device, the sensing ring, the strain gauge, the inner swing rod, the outer swing rod, the tension spring, the pressure spring, the probe and the detection circuit are arranged, the sensing ring independently designed in the probe triggering device is convenient to assemble, the strain gauge is pasted above the outer swing rod and covers equivalent deformation areas on the two sides, and deformation detection is more sensitive; the design of the inner swing rod and the outer swing rod of the device can trigger the probe in all directions to complete measurement, high-precision acquisition of trigger signals by combining the strain gauge technology is combined, and the structure is simple, reasonable, firm and reliable.

Description

Technical Field

[0001] The utility model belongs to the technical field of online detection of numerically controlled machine tools, and in particular relates to a probe trigger device based on a strain gauge. Background Art

[0002] Online detection products for CNC machine tools take into account the processing conditions and the conditions of the machine tool carrier. Most of them adopt trigger-type products, and their trigger units mostly adopt contact-type contact structures. Although they have the advantages of low cost and reliable performance, they cannot avoid the shortcomings of precision loss caused by wear and limited service life. Therefore, a probe trigger device based on strain gauges is needed to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to provide a probe trigger device based on strain gauges to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a probe trigger device based on a strain gauge, comprising a sensing ring, a plurality of strain gauges, an outer swing arm, an inner swing arm, a compression spring, a tension spring, a housing, a plurality of screws, a measuring needle and a detection circuit, wherein the inner swing arm extends a plurality of equally divided fulcrums along the circumferential direction, the outer swing arm extends a plurality of equally divided fulcrums along the circumferential direction, the outer swing arm is provided with positioning grooves corresponding to the inner swing arm fulcrums, the sensing ring is provided with positioning grooves corresponding to the outer swing arm fulcrums, the positioning grooves in the sensing ring are bonded to the strain gauge, the outer swing arm is connected to the housing through a compression spring, the outer swing arm is connected to the inner swing arm through a tension spring, the top of the inner swing arm is connected to the measuring needle, and the plurality of strain gauges are connected to the detection circuit.

[0005] As a preferred implementation, the compression spring is sleeved outside the outer swing arm.

[0006] As a preferred embodiment, the tension spring is arranged in the inner swing arm.

[0007] As a preferred implementation, the sensor ring is connected to the housing via a plurality of screws.

[0008] As a preferred embodiment, the tension spring and the compression spring are both arranged in the outer shell, and the tension spring and the compression spring are arranged between the inner swing arm and the outer shell.

[0009] As a preferred implementation, the structure between the fulcrum and the positioning groove can be set to various types.

[0010] Compared with the prior art, the beneficial effects of the utility model are:

[0011] The utility model is provided with a sensing ring, a strain gauge, an inner swing arm, an outer swing arm, a tension spring, a compression spring, a measuring needle and a detection circuit. The sensing ring designed independently in the measuring needle triggering device is easy to assemble. Moreover, since the strain gauge is pasted on the top of the outer swing arm, the equivalent deformation area on both sides is covered, and the detection of deformation is more sensitive. In addition, the inner and outer swing arm design of the device can trigger the measuring needle in all directions to complete the measurement. The trigger signal is collected with high precision by combining the strain gauge technology. The structure is simple and reasonable, and the device is firm and reliable.

[0012] The utility model is provided with a fulcrum and a positioning groove. The fulcrum and the positioning groove can be made into a spherical surface and a V-shaped groove for positioning, or two spherical surfaces and a cylindrical surface or a V-shaped cylindrical surface for positioning, so that the same positioning effect can be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model in a frontal perspective;

[0014] Figure 2 It is a schematic diagram of the cross-sectional structure of the housing of the utility model when viewed from the front;

[0015] Figure 3 For this utility model Figure 2 The enlarged structural diagram at A in the middle;

[0016] Figure 4 It is a schematic diagram of the cross-sectional structure of the shell of the utility model in a three-dimensional side view;

[0017] Figure 5 For this utility model Figure 4 The enlarged structural diagram at B in the middle;

[0018] Figure 6 It is a schematic diagram of the structure of the utility model in a three-dimensional top view;

[0019] Figure 7 It is a schematic diagram of the sectional structure of the utility model in a front view;

[0020] Figure 8 This is a schematic diagram of the equivalent structure of the A / B amplification structure of the utility model;

[0021] Fig. 9 This is a display diagram of the resistance change of the strain gauge of the utility model.

[0022] In the figure: 1. sensing ring; 2. strain gauge; 3. outer swing arm; 4. inner swing arm; 5. compression spring; 6. tension spring; 7. housing; 8. screw; 9. measuring needle; 10. detection circuit; 101. fulcrum. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with embodiments.

[0024] The following examples are used to illustrate the present invention, but cannot be used to limit the scope of protection of the present invention. The conditions in the examples can be further adjusted according to specific conditions, and simple improvements to the method of the present invention under the premise of the concept of the present invention are all within the scope of protection claimed by the present invention.

[0025] See also Figure 1-9 The utility model provides a probe trigger device based on a strain gauge, comprising a sensing ring 1, a plurality of strain gauges 2, an outer swing rod 3, an inner swing rod 4, a compression spring 5, a tension spring 6, a housing 7, a plurality of screws 8, a measuring needle 9 and a detection circuit 10, wherein the inner swing rod 4 extends a plurality of equally spaced fulcrums 101 along a circumferential direction, the outer swing rod 3 extends a plurality of equally spaced fulcrums 101 along a circumferential direction, a positioning groove corresponding to the fulcrum 101 of the inner swing rod 4 is arranged in the outer swing rod 3, and a positioning groove corresponding to the fulcrum 101 of the outer swing rod 3 is arranged in the sensing ring 1, and by providing the fulcrum 101 and the positioning groove, the structure of the fulcrum 101 and the positioning groove can be made into a spherical surface and a V-shaped groove for positioning, or can be made into two spherical surfaces and a cylindrical surface or a V-shaped cylindrical surface for positioning, so that the same positioning effect can be obtained.

[0026] The positioning groove in the sensing ring 1 is bonded to the strain gauge 2. By setting the strain gauge 2, the bonding position of the strain gauge 2 spans across both sides of the fulcrum 101 to cover the equivalent deformation area as much as possible.

[0027] The outer swing rod 3 is connected to the housing 7 via a compression spring 5, and the compression spring 5 is sleeved outside the outer swing rod 3. By providing the compression spring 5, the compression spring 5 can position and fix the outer swing rod 3 at a coaxial position in the housing 7;

[0028] The outer swing rod 3 is connected to the inner swing rod 4 through a tension spring 6, and the tension spring 6 is arranged in the inner swing rod 4. The sensor ring 1 is connected to the housing 7 through a plurality of screws 8. By setting the sensor ring 1, the positioning groove in the sensor ring 1 shrinks the force of the fulcrum 101 and concentrates it in the deformation area of ​​the sensor ring 1.

[0029] By setting screws 8, the screws 8 can fix the sensor ring 1 in the housing 7;

[0030] The tension spring 6 and the compression spring 5 are both arranged in the housing 7, and the tension spring 6 and the compression spring 5 are arranged between the inner swing rod 4 and the housing 7. By arranging the tension spring 6, the tension spring 6 can position and fix the inner swing rod 4 at a coaxial position in the outer swing rod 3;

[0031] The structure between the fulcrum 101 and the positioning groove can be set to various types, the top of the inner swing rod 4 is connected to the measuring needle 9, and a plurality of strain gauges 2 are connected to the detection circuit 10.

[0032] The working principle and use process of the utility model are as follows: a probe 9 made into various shapes according to the measuring working conditions is connected to the inner swing rod 4. When the measured object contacts the probe 9 and produces a micro displacement, it will eventually be transmitted to the strain pasted in the sensing ring 1. According to the principle of the strain gauge 2, the resistance of the strain gauge 2 at different positions changes. The parameters of the strain gauge 2 pasted in the sensing ring 1 are connected to the detection circuit 10. After the detection circuit 10 determines the state of the trigger unit, it outputs the trigger unit state signal;

[0033] Since the inner swing rod 4 and the outer swing rod 3 are positioned in the circumferential direction, the tension spring 6 applies the tension required for positioning. When the object to be measured contacts the measuring needle 9, the measuring needle 9 can be moved by the swing of the inner swing rod 4. +- X, +- The retreat in the Y direction can be achieved by moving the inner swing rod 4 to achieve the retreat of the probe 9 in the +Z direction. Since the outer swing rod 3 and the sensor ring 1 are positioned in the circumferential direction, the compression spring 5 applies the elastic force required for positioning, and the probe 9 can be achieved by swinging the outer swing rod 3. +- X, +- The retreat in the Y direction can be achieved by displacement of the outer swing rod 3, so that the probe 9 can contact the object to be measured from all directions to realize the measurement function.

[0034] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A probe trigger device based on a strain gauge, comprising a sensing ring (1), a plurality of strain gauges (2), an outer swing rod (3), an inner swing rod (4), a compression spring (5), a tension spring (6), a housing (7), a plurality of screws (8), a measuring needle (9) and a detection circuit (10), characterized in that: The inner swing rod (4) extends a plurality of equally spaced fulcrums (101) along the circumferential direction, the outer swing rod (3) extends a plurality of equally spaced fulcrums (101) along the circumferential direction, a positioning groove corresponding to the fulcrum (101) of the inner swing rod (4) is provided in the outer swing rod (3), a positioning groove corresponding to the fulcrum (101) of the outer swing rod (3) is provided in the sensing ring (1), the positioning groove in the sensing ring (1) is bonded to the strain gauge (2), the outer swing rod (3) is connected to the housing (7) via a compression spring (5), the outer swing rod (3) is connected to the inner swing rod (4) via a tension spring (6), the top of the inner swing rod (4) is connected to a measuring needle (9), and the plurality of strain gauges (2) are connected to a detection circuit (10).

2. A probe trigger device based on strain gauge according to claim 1, characterized in that: The compression spring (5) is sleeved outside the outer swing rod (3).

3. The probe trigger device based on strain gauge according to claim 1, characterized in that: The tension spring (6) is arranged inside the inner swing rod (4).

4. The probe trigger device based on strain gauge according to claim 1, characterized in that: The sensor ring (1) is connected to the housing (7) via a plurality of screws (8).

5. The probe trigger device based on strain gauge according to claim 1, characterized in that: The tension spring (6) and the compression spring (5) are both arranged in the outer shell (7), and the tension spring (6) and the compression spring (5) are arranged between the inner swing rod (4) and the outer shell (7).

6. The probe trigger device based on strain gauge according to claim 1, characterized in that: The structure between the supporting point (101) and the positioning groove can be set to various types.

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