Force sensor

Abstract

The utility model relates to a force sensor, comprising a force sensing unit; the force sensing device is characterized by further comprising a base, a first mounting groove for mounting the force sensing unit is formed in the base, and the base is mounted on a workpiece to be detected through a fastener or in a detachable manner. The device has the advantages that the mounting process of the force sensing unit and the mounting process of the base are separated, the force sensing unit is firstly mounted on the base, and then the base is mounted on the to-be-detected workpiece through the fastener or in a detachable manner, so that the force on the to-be-detected workpiece can be transmitted to the force sensing unit through the base; therefore, the force sensor is convenient to install and short in installation time.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a force sensor. Background Art

[0002] For traditional force sensors, such as strain gauge resistive force sensors, after the sensitive units on the strain gauges are manufactured, a flexible strain gauge is attached above the object to be measured by means of coating with photoresist or resin glue. After being pressurized and heated for a limited time, the glue material is cured to tightly attach the two. Since the time required in the pressurizing and heating process is usually greater than 24 hours, there are problems such as long installation time and complex installation. Therefore, further improvement of the existing technology is needed. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a force sensor with simple installation in view of the above-mentioned existing technology.

[0004] The technical solution adopted by the utility model to solve the above technical problem is as follows: A force sensor includes:

[0005] A force sensitive unit;

[0006] It is characterized by further including:

[0007] A base, a first installation groove for installing the force sensitive unit is formed on the base, and the base is installed on the workpiece to be detected by means of fasteners or in a detachable manner.

[0008] In order to realize the installation between the base and the workpiece to be detected, installation holes for installing fasteners are formed on the base, and the connection between the base and the workpiece to be detected is realized through the fasteners.

[0009] Preferably, the fasteners are screws or bolts.

[0010] Preferably, the base is strip-shaped, the first installation groove is arranged in the center of the base, the installation holes are at least two, two of the installation holes are respectively denoted as a first installation hole and a second installation hole, and the first installation hole and the second installation hole are respectively arranged on both sides of the first installation groove on the base.

[0011] In order to improve the force transmission efficiency, the force sensitive unit has a convex block protruding along the length direction of the base, and an installation part adapted to the convex block is arranged in the first installation groove.

[0012] Preferably, there are two convex blocks, which are respectively arranged at both ends of the force sensitive unit relatively.

[0013] Preferably, the force sensitive unit is connected to the first installation groove by means of snap connection, welding or glue.

[0014] Preferably, the force-sensitive unit uses a quartz resonant crystal.

[0015] In order to further improve the detection accuracy, a second installation groove is also provided on the base, which is oppositely arranged to the first installation groove. The first installation groove and the second installation groove are respectively opened on the upper and lower surfaces of the same position on the base, and the first installation groove and the second first installation groove are respectively for installing a force-sensitive unit.

[0016] Preferably, a groove is provided on the workpiece to be detected, which is oppositely arranged to the first installation groove or the second installation groove, and the groove is used for accommodating the force-sensitive unit installed in the first installation groove or the second installation groove.

[0017] Compared with the prior art, the advantages of the present utility model are as follows: by separating the installation process of the force-sensitive unit and the base, first, the force-sensitive unit is installed on the base, and then the base is installed on the workpiece to be detected by means of fasteners or a detachable method, so that the force on the workpiece to be detected can be transmitted to the force-sensitive unit through the base. Therefore, the installation of this force sensor is convenient and the installation time is short. Description of the Drawings

[0018] Figure 1 is an exploded view of the force sensor in the first embodiment of the present utility model;

[0019] Figure 2 is an exploded view of the installation of the force sensor in the first embodiment of the present utility model;

[0020] Figure 3 is an exploded view of the force sensor in the second embodiment of the present utility model;

[0021] Figure 4 is an exploded view of the installation of the force sensor in the second embodiment of the present utility model. Detailed Embodiments

[0022] The present utility model will be further described in detail below with reference to the embodiments of the drawings.

[0023] Embodiment 1:

[0024] As Figure 1 and Figure 2As shown in the figure, the force sensor in this embodiment includes a force-sensitive unit 1 and a base 2. Among them, a first installation groove 21 for installing the force-sensitive unit 1 is provided on the base 2. The force-sensitive unit 1 in this embodiment adopts the structure shown in the Chinese utility model patent "A Packaging Structure of a Resonant Force Sensor" with the patent number ZL202322000680.4 (the authorized announcement number is CN220748734U). This force-sensitive unit 1 uses a quartz resonant crystal as the sensing core, which is a piezoelectric material. It generates a basic oscillation frequency based on the inverse piezoelectric principle. When an external force acts on it, its frequency changes, and the change amount forms a linear relationship with the external force, which can eliminate the error value generated after being fastened by screws or rivets; the force-sensitive unit 1 is connected to the first installation groove 21 by means of clamping, welding or glue, and the base 2 is installed on the workpiece a to be detected through a fastener 3 or a detachable method. The base 2 in this embodiment can be made of metal or alloy, such as stainless steel, steel, etc.; the depth of the first installation groove 21 is between 0.1 mm and 5 mm.

[0025] An installation hole for installing the fastener 3 is provided on the base 2, and the connection between the base 2 and the workpiece a to be detected is realized through the fastener 3. The fastener 3 in this embodiment is a screw or a bolt. As Figure 1 shown, the base 2 in this embodiment is strip-shaped, the first installation groove 21 is provided in the center of the base 2, and there are at least two installation holes. Two of the installation holes are respectively denoted as the first installation hole 22a and the second installation hole 22b, and the first installation hole 22a and the second installation hole 22b are respectively provided on both sides of the first installation groove 21 on the base 2.

[0026] The force-sensitive unit 1 has a convex block protruding along the length direction of the base 2, and an installation part adapted to the convex block is provided in the first installation groove 21. As Figure 1 shown, there are two convex blocks in this embodiment, which are the first convex block 11 and the second convex block 12 respectively. The first convex block 11 and the second convex block 12 are respectively oppositely provided at both ends of the force-sensitive unit 1. The two ends of the first installation groove 21 are respectively provided with a first installation part 21a adapted to the first convex block 11 and a second installation part 21b adapted to the second convex block 12. The force energy will be transmitted to the force-sensitive unit through the vertex of the convex block. After verification, compared with the original flat structure, this convex block can increase the force energy transmission by more than 20%.

[0027] As Figure 2As shown, the workpiece a to be detected in this embodiment is cylindrical. The workpiece a to be detected is provided with a first jack 10a corresponding to the first mounting hole 22a and a second jack 10b corresponding to the second mounting hole 22b. First, the force-sensitive unit 1 is fixed in the first mounting groove 21 by gluing or welding. Then, the force sensor is arranged on the outer wall of the workpiece a to be detected along the axial direction of the workpiece a to be detected. By inserting two fasteners into the first jack 10a from the first mounting hole 22a and into the second jack 10b from the second mounting hole 22b respectively, the force sensor is fixed on the workpiece a to be detected.

[0028] When the workpiece a to be detected is subjected to an external force, for example, external forces such as torsion, bending, compression, and tension will all cause deformation. Its force energy will be transmitted to the force-sensitive unit 1 by the fastener 3. The force-sensitive unit 1 thus senses the force energy and generates deformation. The oscillation frequency of the quartz resonant crystal therein will also shift, and its shift value is linearly related to the external force received. Therefore, it can be used as a force sensor.

[0029] Embodiment 2:

[0030] As Figure 3 and Figure 4 shown, different from Embodiment 1, a second mounting groove 22 opposite to the first mounting groove 21 is further formed on the base 2 in this embodiment. The first mounting groove 21 and the second mounting groove 22 are respectively formed on the upper and lower surfaces of the same position on the base 2. The first mounting groove 21 and the first mounting groove 21 respectively accommodate a force-sensitive unit 1 for installation. The structures of the first mounting groove 21 and the second mounting groove 22 in this embodiment are the same.

[0031] In addition, a groove 1a opposite to the first mounting groove 21 or the second mounting groove 22 is formed on the workpiece a to be detected. The groove 1a is used to accommodate the force-sensitive unit 1 installed in the first mounting groove 21 or the second mounting groove 22. As Figure 4 shown, the second mounting groove 22 is opposite to the groove 1a, so that the groove 1a can accommodate the force-sensitive unit 1 installed in the second mounting groove 22.

[0032] As Figure 4 shown, the workpiece a to be detected in this embodiment is strip-shaped. The groove 1a is formed on the outer wall of the workpiece a to be detected. When the workpiece a to be detected is subjected to an external force, one of the force-sensitive units 1 respectively installed in the first mounting groove 21 and the second mounting groove 22 will generate pressure, and the other will generate tension, so that the two force-sensitive units 1 generate different frequency values, and the frequency difference can be linearly related, and the accuracy is higher than that of one force-sensitive unit 1 in Embodiment 1.

[0033] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. A force sensor, comprising: Force sensitive unit (1); The invention is characterized in that it also includes: A base (2), wherein a first mounting groove (21) for mounting the force sensitive unit (1) is provided on the base (2), and the base (2) is mounted on a workpiece (a) to be detected by means of a fastener (3) or in a detachable manner.

2. The force sensor according to claim 1, characterized in that: The base (2) is provided with mounting holes (22a, 22b) for mounting fasteners (3), and the base (2) and the workpiece (a) to be detected are connected via the fasteners (3).

3. The force sensor according to claim 2, characterized in that: The fastener (3) is a screw or a bolt.

4. The force sensor according to claim 2, characterized in that: The base (2) is in the shape of an elongated strip. The first mounting groove (21) is arranged at the center of the base (2). There are at least two mounting holes (22a, 22b), two of which are respectively referred to as a first mounting hole (22a) and a second mounting hole (22b). The first mounting hole (22a) and the second mounting hole (22b) are respectively arranged on both sides of the first mounting groove (21) on the base (2).

5. The force sensor according to claim 4, characterized in that: The force sensitive unit (1) has a protrusion (11, 12) protruding along the length direction of the base (2), and a mounting portion (21a, 21b) adapted to the protrusion (11, 12) is provided in the first mounting groove (21).

6. The force sensor according to claim 5, characterized in that: There are two protrusions (11, 12), which are respectively arranged at two opposite ends of the force sensitive unit (1).

7. The force sensor according to claim 5, characterized in that: The force sensitive unit (1) is connected to the first installation groove (21) by means of snap connection, welding or gluing.

8. The force sensor according to any one of claims 1 to 7, characterized in that: The force sensitive unit (1) adopts a quartz resonant crystal.

9. The force sensor according to claim 8, characterized in that: The base (2) is also provided with a second mounting groove (22) arranged opposite to the first mounting groove (21); the first mounting groove (21) and the second mounting groove (22) are respectively provided on the upper and lower surfaces of the same position on the base (2); the first mounting groove (21) and the second first mounting groove (21) are respectively provided for mounting a force sensitive unit (1).

10. The force sensor according to claim 9, characterized in that: A groove (1a) is arranged on the workpiece (a) to be detected and is opposite to the first mounting groove (21) or the second mounting groove (22), and the groove (1a) is used to accommodate a force sensitive unit (1) installed in the first mounting groove (21) or the second mounting groove (22).

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