Displacement measuring device and displacement measuring instrument

Abstract

The utility model relates to the technical field of displacement measurement, and discloses a displacement measuring device and a displacement measuring instrument, and the displacement measuring device at least comprises a motor, a transmission shaft, a first gear, a first rack, a resistance strain gauge, a second rack, a detection head, a controller and a housing. An output shaft of the motor is in power connection with one end of the transmission shaft; the other end of the transmission shaft is coaxially connected with a first gear; the first gear is meshed with a first rack; the first rack is coaxially connected with a first end face of a resistance strain gauge; the two ends of the second rack are coaxially connected with the second end face of the resistance strain gauge and the detection head respectively. And the controller receives the deformation quantity of the resistance strain gauge, obtains a reverse acting force based on the deformation quantity, generates a control instruction when the reverse acting force is equal to a threshold value configured in the controller, controls the motor to be switched to a stop state, and determines the displacement based on the position information of the detection head in the stop state. The device and the instrument provided by the utility model are high in measurement precision and simple and convenient to operate.

Description

Technical Field

[0001] The utility model relates to the technical field of displacement measurement, in particular to a displacement measurement device and a displacement measurement instrument. Background Art

[0002] When an object is deformed due to external factors (force, humidity, temperature field changes, etc.), internal forces interacting with each other are generated between the parts of the object. The internal force per unit area is called stress. Stress will cause the components inside the object to deform. When the stress disappears, the components will try to recover from the position after deformation to the position before deformation, causing the object to shake.

[0003] The ultrasonic therapy device has a telescopic mechanism. When the user presses the touch screen of the telescopic mechanism, the touch screen deforms due to the pressure of the finger on the screen, which in turn causes the telescopic mechanism to move. When the displacement is too large, it will affect the stability of the ultrasonic therapy device. Therefore, it is very necessary to measure the displacement.

[0004] The existing method of measuring displacement is to use a combination of a push-pull force gauge and a dial indicator. A certain force is applied to one end of the telescopic mechanism, and the displacement generated is measured at the other end. This method has the following defects: first, since the push-pull force gauge is a force measuring device rather than a force generating device, it is difficult to meet the requirements of stable thrust output, which affects the measurement accuracy; second, the operation is relatively cumbersome. Since it needs to be operated at both ends of the telescopic mechanism, at least two people need to cooperate to complete the measurement. Utility Model Content

[0005] The utility model aims to provide a displacement measuring device and a displacement measuring instrument, which are used to solve the problems of low measurement accuracy and complicated operation in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] In a first aspect, the utility model provides a displacement measuring device, comprising at least a motor, a transmission shaft, a first gear, a first rack, a resistance strain gauge, a second rack, a detection head, a controller and a housing;

[0008] The motor, the transmission shaft, the first gear, the first rack, the second rack, the resistance strain gauge, and the controller are all located inside the housing; the detection head is located outside the housing;

[0009] The output shaft of the motor is connected to one end of the transmission shaft; the other end of the transmission shaft is coaxially connected to the first gear; the first gear is meshed with the first rack, and one end of the first rack close to the second rack is coaxially connected to the first end face of the resistance strain gauge; the first end of the second rack is coaxially connected to the second end face of the resistance strain gauge, and the second end of the second rack is coaxially connected to the detection head;

[0010] The controller is electrically connected to the resistance strain gauge, receives the deformation of the resistance strain gauge, and obtains a reverse force based on the deformation. When the reverse force is equal to a threshold configured inside the controller, a control instruction is generated. After receiving the control instruction, the motor switches from an on state to a stopped state. The initial position information of the detection head is defined as the first position information, and the position information of the detection head in the stopped state is defined as the second position information. The displacement is determined based on the second position information and the first position information.

[0011] As a possible implementation method, the displacement measuring device also includes a transmission assembly and a displacement indicator; the first end of the transmission assembly is meshed with the second rack, and the second end of the transmission assembly is meshed with the driving gear of the pointer included in the displacement indicator; the displacement indicator is arranged on the outer wall of the shell.

[0012] As a possible implementation, the first end of the transmission assembly has a second gear, the second end of the transmission assembly has a third gear, the second gear meshes with the second rack, and the third gear meshes with the driving gear of the pointer included in the displacement indicator.

[0013] As a possible implementation method, the outer wall of the shell has a test reference surface, and the test reference surface has a through hole with the same shape as the detection surface of the detection head; when the test device is in a closed state, the detection surface of the detection head and the test reference surface are in the same plane.

[0014] As a possible implementation manner, the motor is a micro servo motor, and the second position information is determined based on the rotation angle of the motor when it switches from an on state to a stopped state.

[0015] As a possible implementation, the second rack has a displacement value, and the second position information is determined based on the displacement value at the vertical intersection of the test reference plane and the second rack when the motor is switched to a stopped state;

[0016] And / or, the second position information is determined based on the deflection amount of the pointer in the displacement indicator.

[0017] As a possible implementation manner, the threshold is 5N, 10N, 20N, 50N or 100N.

[0018] As a possible implementation, the displacement indication range of the displacement indicator is 0 to 25 mm, and the indication accuracy is 0.1 mm.

[0019] In a second aspect, the utility model provides a displacement measuring instrument, comprising: a displacement measuring device, a fixing seat, a support rod, and a base;

[0020] The displacement measuring device is the displacement measuring device provided by the first aspect of the utility model;

[0021] The fixing seat has a mounting groove and a knob; the bottom of the fixing seat is connected to one end of the support rod; the support rod is a telescopic support rod, and one end of the support rod away from the fixing seat is connected to the base.

[0022] As a possible implementation manner, when the displacement measuring instrument is in a measuring state, the displacement measuring device is placed in the mounting slot, and the knob is used to adjust the angle of the displacement measuring device and fix the displacement measuring device.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The displacement measuring device provided by the utility model uses one device to measure the displacement. Compared with the traditional method of using a combination of a push-pull dynamometer and a dial indicator, it is easy to operate, does not require the cooperation of multiple people, and has strong flexibility in use.

[0025] 2. The displacement measuring device provided by the utility model can stably output thrust and receive a constant thrust value of reaction, and read the displacement of the object being measured when a preset thrust threshold is reached. The displacement can be determined by combining three methods: the motor rotation angle, the displacement value of the second rack, and the deflection amount of the pointer in the displacement indicator, and the measurement accuracy is high.

[0026] 3. The displacement measuring instrument provided by the utility model adopts a knob to fine-tune the angle of the displacement measuring device and adopts a retractable support rod to adjust the height of the displacement measuring device. It is suitable for a variety of measured objects and has a wide range of uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0028] Figure 1 This is an internal structure diagram of the displacement measuring device in the embodiment of the utility model;

[0029] Figure 2 It is a schematic diagram of the internal structure installation of the displacement measuring device in the embodiment of the utility model;

[0030] Figure 3 This is a diagram of the displacement measurement structure in an embodiment of the utility model.

[0031] Reference numerals

[0032] 1-Displacement measuring device;

[0033] 10-motor, 11-transmission shaft, 12-first gear, 13-first rack, 14-resistance strain gauge, 15-second rack, 16-detection head, 17-controller, 18-transmission assembly, 180-second gear, 181-third gear, 19-displacement indicator, 20-housing;

[0034] 3-fixed seat, 30-knob; 4-support rod; 5-base. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0038] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0039] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] The existing method of measuring displacement uses a combination of a push-pull dynamometer and a dial indicator, which has the following defects: first, since the push-pull dynamometer is a force measuring device rather than a force generating device, it is not easy to meet the requirement of stable thrust output, which affects the measurement accuracy; second, the operation is relatively cumbersome. Since it needs to be operated at both ends of the telescopic mechanism, at least two people are required to cooperate to complete the measurement. In order to solve the problems existing in the prior art, the present invention provides a displacement measuring device and a displacement measuring instrument, which have high measurement accuracy and are easy to operate.

[0041] In a first aspect, the utility model provides a displacement measuring device, see Figure 1 to Figure 2 , at least comprising: a motor 10, a transmission shaft 11, a first gear 12, a first rack 13, a resistance strain gauge 14, a second rack 15, a detection head 16, a controller 17 and a housing 20;

[0042] The motor 10, the transmission shaft 11, the first gear 12, the first rack 13, the second rack 15, the resistance strain gauge 14, and the controller 17 are all located in the housing 20; the detection head 16 is located outside the housing 20;

[0043] The output shaft power of the motor 10 is connected to one end of the transmission shaft 11; the other end of the transmission shaft 11 is coaxially connected to the first gear 12; the first gear 12 is meshed with the first rack 13, and one end of the first rack 13 close to the second rack 15 is coaxially connected to the first end face of the resistance strain gauge 14; the first end of the second rack 15 is coaxially connected to the second end face of the resistance strain gauge 14, and the second end of the second rack 15 is coaxially connected to the detection head 16;

[0044] The controller 17 is electrically connected to the resistance strain gauge 14, receives the deformation of the resistance strain gauge 14, and obtains a reverse force based on the deformation. When the reverse force is equal to a threshold value configured inside the controller 17, a control instruction is generated. After receiving the control instruction, the motor 10 switches from an on state to a stopped state, defines the initial position information of the detection head 16 as the first position information, defines the position information of the detection head 16 in the stopped state as the second position information, and determines the displacement based on the second position information and the first position information.

[0045] See also Figure 1 The motor 1 has an on state and a stopped state. When in the on state, the motor 10 rotates to drive the transmission shaft 11 to rotate. The transmission shaft 11 is coaxially fixedly connected with the first gear 12 to drive the first gear 12 to rotate. The fixing method adopts any one of the existing technologies and will not be repeated here.

[0046] See also Figure 1The first gear 12 is meshed with the first rack 13. When the first gear 12 rotates, a driving force is generated on the first rack 13, pushing the resistance strain gauge 14, the second rack 15, and the detection head 16 to move along the force transmission direction.

[0047] When in use, the detection head acts on the surface of the object to be measured, and the object to be measured generates a reaction force under the action of the driving force. The resistance strain gauge generates deformation under the action of the reaction force and calculates the force value of the reaction force based on the deformation amount; the resistance strain gauge transmits the force value to the controller, and a threshold is preset inside the controller. The controller receives the force value and determines whether it reaches the preset threshold. When the received force value is equal to the preset threshold, the controller generates a control instruction to control the motor to stop rotating. At this time, the motor switches from the on state to the stopped state.

[0048] See also Figures 1 to 2 As a possible implementation method, the displacement measuring device also includes a transmission component 18 and a displacement indicator 19; the first end of the transmission component 18 is meshed with the second rack 15, and the second end of the transmission component 18 is meshed with the driving gear of the pointer included in the displacement indicator 19; the displacement indicator 19 is arranged on the outer wall of the shell 20.

[0049] See also Figure 1 As a possible implementation, the first end of the transmission assembly 18 has a second gear 180, the second end of the transmission assembly 18 has a third gear 181, the second gear 180 is meshed with the second rack 15, and the third gear 181 is meshed with the driving gear of the pointer included in the displacement indicator.

[0050] The first end and the second end of the transmission component are both provided with a plurality of protrusions or depressions meshing with the second rack, or the first end and the second end of the transmission component are both provided with gears. When the second rack is displaced under the action of the driving force, the transmission component is driven to rotate, and the second end of the transmission component is meshed with the driving gear of the pointer included in the displacement indicator. Therefore, the rotation of the transmission component drives the deflection of the pointer included in the displacement indicator.

[0051] See also Figure 2 As a possible implementation, the housing 20 has a test reference surface, which is provided with a through hole having the same shape as the detection surface of the detection head 16; when the test device is in a closed state, the detection surface of the detection head 16 and the test reference surface are in the same plane.

[0052] As a possible implementation manner, the motor is a micro servo motor, and the second position information is determined based on the rotation angle of the motor when it switches from an on state to a stopped state.

[0053] The micro servo motor takes up little space, which is conducive to the lightweight and miniaturized design of the device. After the motor is selected, the displacement of the first rack corresponding to the rotation angle of the motor is known, so the second position information can be determined based on the rotation angle when the motor switches from the on state to the stopped state.

[0054] As a possible implementation, the second rack has a displacement value, and the second position information is determined based on the displacement value at the vertical intersection of the test reference plane and the second rack when the motor is switched to a stopped state;

[0055] And / or, the second position information is determined based on the deflection amount of the pointer in the displacement indicator.

[0056] When the motor is switched to the stop state, the pointer included in the displacement indicator stops at a certain displacement value of the displacement indicator. The displacement value at this time is the displacement of the measured object under the driving force of the threshold value.

[0057] As a possible implementation manner, the threshold value is 5N, 10N, 20N, 50N, or 100N.

[0058] As a possible implementation, the displacement indication range of the displacement indicator is 0 to 25 mm, and the indication accuracy is 0.1 mm.

[0059] When in use, adjust the test reference surface and the detection surface of the detection head to fit evenly on the surface of the object to be measured before starting the motor to rotate, so as to ensure the accuracy of the measurement result.

[0060] In a second aspect, the utility model also provides a displacement measuring instrument, see Figure 3 , including: a displacement measuring device 1, a fixing seat 3, a support rod 4, and a base 5;

[0061] The displacement measuring device 1 is the displacement measuring device provided by the first aspect of the utility model;

[0062] The fixing seat 3 has a mounting groove and a knob 30 ; the bottom of the fixing seat 3 is connected to one end of the support rod 4 ; the support rod 4 is a retractable support rod, and one end of the support rod 4 away from the fixing seat 3 is connected to the base 5 .

[0063] As a possible implementation manner, when the displacement measuring instrument is in a measuring state, the displacement measuring device is placed in the mounting groove, and the knob is used to adjust the angle of the displacement measuring device and fix the displacement measuring device.

[0064] Compared with the prior art, the utility model has the following technical effects:

[0065] 1. The displacement measuring device provided by the utility model uses one device to measure the displacement. Compared with the traditional method of using a combination of a push-pull dynamometer and a dial indicator, it is easy to operate, does not require the cooperation of multiple people, and has strong flexibility in use.

[0066] 2. The displacement measuring device provided by the utility model can stably output thrust and receive a constant thrust value of reaction, and read the displacement of the object being measured when a preset thrust threshold is reached. The displacement can be determined by combining three methods: the motor rotation angle, the displacement value of the second rack, and the deflection amount of the pointer in the displacement indicator, and the measurement accuracy is high.

[0067] 3. The displacement measuring device provided by the utility model can stably output thrust and receive a constant thrust value of reaction, and read the displacement of the object being measured when a preset thrust threshold is reached. The displacement can be determined by combining three methods: the motor rotation angle, the displacement value of the second rack, and the deflection amount of the pointer in the displacement indicator, and the measurement accuracy is high.

[0068] Although the present invention is described herein in conjunction with various embodiments, in the process of implementing the claimed invention, those skilled in the art may understand and implement other changes to the disclosed embodiments by viewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other components or steps, and "one" or "an" does not exclude multiple situations. A single processor or other unit may implement several functions listed in a claim. Certain measures are recorded in different dependent claims, but this does not mean that these measures cannot be combined to produce good results.

[0069] Although the utility model has been described in conjunction with specific features and embodiments thereof, it is obvious that various modifications and combinations may be made thereto without departing from the spirit and scope of the utility model. Accordingly, this specification and the drawings are merely exemplary illustrations of the utility model as defined by the appended claims, and are deemed to have covered any and all modifications, variations, combinations or equivalents within the scope of the utility model. Obviously, those skilled in the art may make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the claims of the utility model and their equivalents, the utility model is also intended to include these modifications and variations.

Claims

1. A displacement measuring device, characterized in that: At least includes a motor, a transmission shaft, a first gear, a first rack, a resistance strain gauge, a second rack, a detection head, a controller and a housing; The motor, the transmission shaft, the first gear, the first rack, the second rack, the resistance strain gauge, and the controller are all located inside the housing; the detection head is located outside the housing; The output shaft of the motor is connected to one end of the transmission shaft; the other end of the transmission shaft is coaxially connected to the first gear; the first gear is meshed with the first rack, and one end of the first rack close to the second rack is coaxially connected to the first end face of the resistance strain gauge; the first end of the second rack is coaxially connected to the second end face of the resistance strain gauge, and the second end of the second rack is coaxially connected to the detection head; The controller is electrically connected to the resistance strain gauge, receives the deformation of the resistance strain gauge, and obtains a reverse force based on the deformation. When the reverse force is equal to a threshold configured inside the controller, a control instruction is generated. After receiving the control instruction, the motor switches from an on state to a stopped state, defines the initial position information of the detection head as the first position information, defines the position information of the detection head in the stopped state as the second position information, and determines the displacement based on the second position information and the first position information.

2. The displacement measuring device according to claim 1, characterized in that: The displacement measuring device also includes a transmission assembly and a displacement indicator; the first end of the transmission assembly is meshed with the second rack, and the second end of the transmission assembly is meshed with a driving gear of a pointer included in the displacement indicator; the displacement indicator is arranged on the outer wall of the shell.

3. The displacement measuring device according to claim 2, characterized in that: The first end of the transmission assembly has a second gear, the second end of the transmission assembly has a third gear, the second gear is meshed with the second rack, and the third gear is meshed with a driving gear of a pointer included in the displacement indicator.

4. The displacement measuring device according to claim 2, characterized in that: The outer wall of the shell has a test reference surface, and the test reference surface is provided with a through hole having the same shape as the detection surface of the detection head; when the displacement measuring device is in a closed state, the detection surface of the detection head and the test reference surface are in the same plane.

5. The displacement measuring device according to any one of claims 1 to 4, characterized in that: The motor is a micro servo motor, and the second position information is determined based on the rotation angle of the motor when it switches from an on state to a stopped state.

6. The displacement measuring device according to claim 4, characterized in that: The second rack has a displacement value, and the second position information is determined based on the displacement value at the vertical intersection of the test reference plane and the second rack when the motor is switched to a stopped state; And / or, the second position information is determined based on the deflection amount of a pointer in a displacement indicator.

7. The displacement measuring device according to claim 1, characterized in that: The threshold value is 5N, 10N, 20N, 50N or 100N.

8. The displacement measuring device according to claim 2, characterized in that: The displacement indication range of the displacement indication meter is 0 to 25 mm, and the indication accuracy is 0.1 mm.

9. A displacement measuring instrument, characterized in that: include: Displacement measuring device, fixing seat, support rod, base; The displacement measuring device is the displacement measuring device according to any one of claims 1 to 8; The fixing seat has a mounting groove and a knob; the bottom of the fixing seat is connected to one end of the support rod; the support rod is a telescopic support rod, and one end of the support rod away from the fixing seat is connected to the base.

10. The displacement measuring instrument according to claim 9, characterized in that: When the displacement measuring instrument is in a measuring state, the displacement measuring device is placed in the mounting slot, and the knob is used to adjust the angle of the displacement measuring device and fix the displacement measuring device.

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