CN109506824B - Clamping force measuring device of variable-pitch automatic door - Google Patents

Clamping force measuring device of variable-pitch automatic door Download PDF

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Publication number
CN109506824B
CN109506824B CN201811464636.6A CN201811464636A CN109506824B CN 109506824 B CN109506824 B CN 109506824B CN 201811464636 A CN201811464636 A CN 201811464636A CN 109506824 B CN109506824 B CN 109506824B
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rod
sleeve
support
pressure sensor
force
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CN109506824A (en
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高文科
南西康
李勃旭
梁鑫
陈旭峰
仓恒
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Nanjing Huidian Railway Equipment Co.,Ltd.
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Lanzhou University of Technology
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • G01L5/22Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes for measuring the force applied to control members, e.g. control members of vehicles, triggers

Abstract

The invention relates to a clamping force measuring device of a variable-pitch automatic door, which comprises a sleeve (3), a screw rod (8), a guide sleeve rod (6), a spring (7), a pressure sensor (5), a data processing end, a left support (14), a right support (2), a force measuring contact end (19) and the like, and has the characteristics of simple structure, simplicity in operation, lightness, flexibility and convenience in carrying. When the device is used, the position of the left support (14) on the device is adjusted by rotating the screw rod (8), so that the measurement gap between the front force measuring contact end (19) and the rear force measuring contact end (19) is adjusted. During force measurement, the left support moves leftwards, the right support moves rightwards, the spring is compressed in the relative movement process, and the pressure sensor obtains a transverse axial force and generates a corresponding pressure signal to be sent to the data processing end. The invention further provides an automatic measuring device integrating data acquisition, calculation and display, and the automatic measuring device is complete in function and convenient to use.

Description

Clamping force measuring device of variable-pitch automatic door
Technical Field
The invention relates to the technical field of automatic door clamping force measurement, in particular to a variable-pitch automatic door clamping force measuring device.
Background
In the process of mechanical equipment such as elevators, passenger cars, motor cars, high-speed rails, subways, large machine tools and the like, the clamping force of an automatic door is generally required to be measured. At present, the conventional force measuring devices are based on a fixed measuring distance, i.e., the measuring distance is fixed and non-adjustable, which does not meet the requirement for measuring different distances. Based on this, it is needed a clamping force measuring device with adjustable measuring gap as required
Disclosure of Invention
The invention aims to solve the technical problem of providing a variable-pitch automatic door clamping force measuring device, wherein the measuring gap of the variable-pitch automatic door clamping force measuring device is adjustable, so that the trouble caused by unadjustable distance is solved.
In order to solve the problems, the clamping force measuring device for the variable-pitch automatic door comprises a sleeve, a screw rod, a guide sleeve rod, a spring, a pressure sensor, a data processing end, a left support and a right support, wherein the right end of the screw rod is arranged at the center of a left side plate of the sleeve and can rotate; the four connecting rods are equal in length; the left support is in threaded connection with the screw, a transparent position observation port is arranged at the left end of the left support, and a reading comparison point is arranged at a position on the screw, which corresponds to the position observation port; the scales on the position observation port represent 0.5 time of the horizontal distance between the rotation centers of the two ends of the left connecting rod and the right connecting rod; when the device is used, the position of the left support is adjusted by rotating the screw rod, so that the measurement gap between the front force measurement contact end and the rear force measurement contact end is adjusted.
Preferably, the right end of the screw rod extends into the central through hole of the left side plate of the sleeve and penetrates through the bearing inner ring to realize interference connection, and a fixing part for fixing the position of the bearing is arranged on the screw rod; and the screw rod is provided with a nut which is close to the left end of the left side plate of the sleeve.
Preferably, the right end part of the screw is located inside the sleeve, the contact nail is arranged at the end part, a step is arranged on the inner wall of the sleeve and at the position flush with the right end part of the contact nail, and the step is used for blocking the baffle at the left end of the guide sleeve rod from moving leftwards.
Preferably, the baffle at the left end of the guide sleeve rod is provided with an annular groove for clamping the left end of the spring, and the rod body of the guide sleeve rod is provided with an opening for accommodating the pressure sensor; the pressure sensor can move left and right in the opening, and two ends of the pressure sensor extending out of the opening are connected with the right end of the spring.
Preferably, the device further comprises a data input interface for inputting readings of the observation port, the data processing end comprises a processor and a display, the processor is used for processing pressure signals from the pressure sensor to obtain corresponding pressure values, substituting the pressure values and the input readings of the observation port into a prestored calculation formula to obtain the clamping force between the two force measurement contact ends, and controlling the display to display the clamping force.
Preferably, the scale on the position viewing port displays an initial distance point and an adjustment amount made in comparison with the initial distance point, and the data input interface is configured to input the adjustment amount, where an increment is positive and a decrement is negative.
Preferably, the device further comprises a power source for powering the pressure sensor, the processor and the display.
Preferably, the device further comprises a protective housing internally mounting the sleeve, the processor and the power source.
Preferably, the right end of the guide sleeve rod is provided with a handle.
Compared with the prior art, the invention has the following advantages:
1. in the invention, from the macroscopic geometrical relationship, the whole measuring device is essentially a rhombus with fixed side length, two force measuring contact ends are positioned at two ends of a vertical diagonal of the rhombus, a left support and a right support are positioned at two ends of a horizontal diagonal of the rhombus, and the position of the left support can be adjusted by rotating a screw rod, so that the adjustment of a measuring gap between the two force measuring contact ends is realized; when the two force-measuring contact ends are stressed, the stress is transmitted to the left support and the right support through the four connecting rods, at the moment, the left support drives the sleeve to move leftwards through the screw rod, the right support drives the guide sleeve rod to move rightwards, the spring is compressed in the relative movement process, and the pressure sensor obtains a transverse axial force and generates a corresponding pressure signal to be sent to the data processing end for subsequent analysis and calculation. And at the later stage, the pressure value corresponding to the pressure signal and the horizontal distance value read from the position observation port are substituted into a prepared calculation formula (obtained by geometric relationship and stress analysis), so that the clamping force between the two force measuring contact ends can be calculated.
Therefore, the measuring device effectively solves the problem of nonadjustable measuring distance in the prior art, and has the characteristics of simple structure, simple operation, lightness, flexibility and convenient carrying.
2. On the basis of the point 1, the data processing end specifically comprises a processor and a display, after the adjustment of the measurement gap is finished, the numerical value read from the observation port is input, and when the two force measurement contact ends are stressed, the processor automatically executes the calculation process and controls the display to display the calculation result, so that the automatic measurement device integrating data acquisition, calculation and display is realized, the function is complete, and the use is convenient.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic view of the overall structure of a variable-pitch automatic door clamping force measuring device according to an embodiment of the present invention.
Fig. 2 is a front view of a variable-pitch automatic door clamping force measuring device according to an embodiment of the present invention.
Fig. 3 is a cross-sectional view a-a of fig. 2.
Fig. 4 is a geometric diagram of the clamping force measuring device of the variable-pitch automatic door according to the embodiment of the present invention in an unstressed state.
Fig. 5 is a force relationship diagram of the variable-pitch automatic door clamping force measuring device according to the embodiment of the present invention in a stressed state.
Fig. 6 is a diagram of a stress analysis performed on the node a in fig. 5 according to an embodiment of the present invention.
Fig. 7 is a stress analysis diagram performed on the node D in fig. 5 according to an embodiment of the present invention.
FIG. 8 is a graph illustrating force analysis performed on the AD rod of FIG. 5 according to an embodiment of the present invention.
In the figure: 1-handle, 2-right support, 3-sleeve, 4-central short shaft, 5-pressure sensor, 6-guide sleeve rod, 7-spring, 8-screw, 9-screw shaft shoulder, 10-gasket, 11-contact nail, 12-bearing, 13-nut, 14-left support, 15-position observation port, 16-display, 17-connecting rod, 18-hinge bearing, 19-force measuring contact end, and 20-protective shell.
Detailed Description
Referring to fig. 1 to 3, an embodiment of the present invention provides a variable-pitch automatic door clamping force measuring device, which specifically includes a sleeve 3, a screw 8 whose right end is disposed at a center position of a left side plate of the sleeve 3 and is capable of rotating, a guide sleeve rod 6 which is disposed in a center through hole of a right side plate of the sleeve 3 and is capable of moving left and right, a spring 7 and a pressure sensor 5 which are sequentially disposed between a baffle at a left end of the guide sleeve rod 6 and the right side plate of the sleeve 3, a data processing end which is connected with the pressure sensor 5 and is used for receiving and processing a pressure signal, a left support 14 and a right support 2 which are respectively disposed at a left end of the screw 8 and a right end of the guide sleeve rod 6, and two front and rear symmetrical force measuring contact ends 19 which are hinged between the two supports through four. The terms "left and right", "front and back" are based on the perspective of fig. 1 and 2.
A transparent position observation port 15 is arranged at the left end of the left support 14, the position observation port 15 moves along with the movement of the left support 14, and a reading comparison point is arranged at the position, corresponding to the position observation port 15, on the screw 8; the scale on the position observation port 15 represents 0.5 times the horizontal distance between the rotation centers of both ends of the left and right connecting rods 17. When reading, the corresponding scale of the control point on the position observation port 15 is read. The specific display of the scale may be a numerical value representing the actual distance, or may be a numerical value indirectly reflecting the actual distance, for example, displaying the initial distance point and the adjustment amount made compared with the initial distance point, where the initial distance is fixed and known, the increment is positive, and the decrement is negative, and this display mode is convenient for reading and using the case where the required data is the adjustment amount (the following specific case is referred to).
The four connecting rods 17 are equal in length, the horizontal central axes of the screw rod 8 and the guide sleeve rod 6 are on the same straight line, the whole measuring device is substantially rhombic from the macroscopic geometrical relation, the two force measuring contact ends 19 are positioned at two ends of a rhombic vertical diagonal, and the left support and the right support are positioned at two ends of a rhombic horizontal diagonal; of course, it can be understood that, strictly speaking, the rotation centers of the two connecting rods 17 at the force-measuring contact end 19 are the end points of the rhombic vertical diagonal line, and the rotation centers of the connecting rods 17 on the left and right supports are the end points of the rhombic horizontal diagonal line; the foregoing will be primarily employed herein for ease of memory and understanding.
When the measurement gap between the two force measuring contact ends 19 needs to be adjusted, the position of the left support 14 on the left support is adjusted by rotating the screw 8, namely the length of the horizontal diagonal of the diamond is adjusted, and further the length of the vertical diagonal of the diamond is adjusted, namely the measurement gap is adjusted.
After the measurement gap is adjusted properly and fixed, when two dynamometry contact terminals 19 are stressed, because of the integral diamond structure and the hinging mode at two ends of the connecting rod 17, when a diagonal line is perpendicular to the diagonal line) is stressed, the force can be transmitted to the other diagonal line (horizontal diagonal line), specifically, the structure that the force borne by the two dynamometry contact terminals 19 is transmitted to the left support and the right support through the four connecting rods 17, the left support 14 drives the sleeve 3 to move leftwards through the screw 8, so that the right side plate of the sleeve 3 compresses the right end of the spring 7 leftwards through the pressure sensor 5, the right support 2 drives the guide sleeve rod 6 to move rightwards through the central through hole of the right side plate of the sleeve 3, so that the baffle at the left end of the guide sleeve rod 6 compresses the left end of the spring 7 rightwards, and: the pressure sensor 5 obtains an axial force transversely leftwards and generates a corresponding pressure signal to be sent to the data processing end.
By combining the diamond structure and the working principle, the relationship between the stress F and the clamping force P of the pressure sensor 5 is deduced as follows from the geometrical relationship, the stress relationship and the stretching amount angle of the spring 7.
Referring to the geometric relationship diagram of the measuring device of the present invention in an unstressed state shown in fig. 4, a A, C node represents front and rear force measuring contact ends 19, a B, D node represents left and right supports, and L is the length of a single connecting rod 17; x is the number of0=x+Δx,x0The center distance of the two supports is 0.5 times after adjustment under the unstressed state, x is 0.5 times of the initial center distance of the two supports when leaving the factory (the value is a known fixed value), and deltax is the adjustment amount generated after adjustment of the measurement gap (so that the two supports are adjustedThe center distance of the support is increased to a positive value and reduced to a negative value); y is0Is 0.5 times of the initial center distance of the two force measuring contact ends 19 when leaving the factory.
Referring to FIG. 5, the force relationship of the measuring device of the present invention in a stressed state is shown, where P is the stressed force of the force-measuring contact end 19, i.e. the clamping force, y1Is the amount of change in the vertical direction, x1The variation in the horizontal direction is α, the angle between the connecting rod 17 and the horizontal line is F, the pressure value measured by the pressure sensor 5, and the stress analysis process is shown below.
(1) Referring to fig. 6, the stress analysis is performed on the node a in fig. 5, and the following results are obtained:
∑Fx=0,F1cosα-F2cosα=0
∑Fy=0,F1sinα+F2sinα-P=0
finishing to obtain: f1=F2,2F1sinα=P。
(2) Referring to fig. 7, the node D in fig. 5 is subjected to stress analysis, and the following results are obtained:
∑Fx=0,F3cosα+F4cosα-F=0
∑Fy=0,F3sinα-F4sinα=0
finishing to obtain: f3=F4,2F3sinα=P。
(3) Referring to fig. 8, taking an AD rod as a separation body, and performing stress analysis to obtain:
∑Fx=0,F1cosα+F3cosα-F=0
∑Fy=0,F1sinα+F3sinα-P=0
and (3) substituting the conclusions obtained in the step (1) and the step (2) into the formula to obtain:
simplifying to obtain:namely, it is
(4) And (5) solving a calculation formula of the clamping force P by combining the following equations. Where k is the elastic coefficient of the spring 7.
(x0+x1)2+(y0-y1)2=x0 2+y0 2=L2
F=kx1
To solve, the calculation formula of the clamping force P is as follows:
in the formula for calculating the clamping force P, the elastic coefficient k, the length L of the tie-rod 17 are known and fixed quantities, F is obtained from the pressure sensor 5, x0By x0X + Δ x, where x is a known and fixed quantity and Δ x is obtained from the position viewing port 15. From this, the value of the clamping force P is finally calculated.
Based on the disclosure of the above embodiments, the details of the structure of the measuring device are further described in another embodiment of the present invention.
The left support 14 and the right support 2 are annular integrally, the middle parts of the front end and the rear end extend out of a connecting plate hinged with the connecting rod 17, the inner wall is provided with internal threads, the left support 14 is in threaded connection with the screw rod 8, and the right support 2 is in threaded connection with the guide sleeve rod 6. The right end part of the guide sleeve rod 6 is provided with a handle 1 through threaded connection, and the left end of the handle 1 is close to the right end of the right support 2.
The force measuring contact end 19 is integrally T-shaped, the transverse edge is used for contacting with a door to be measured, and the longitudinal edge is used for realizing the hinging of the junction of the left connecting rod 17 and the right connecting rod 17. The hinging of the connecting rod 17 with the left and right supports and the hinging between the two connecting rods 17 are realized by the hinge bearing 18 and the central short shaft 4.
The left side plate of the sleeve 3 and the barrel body are of an integrated structure, the right side plate is a cover in threaded connection with the inner wall of the right end of the barrel body, and the threaded connection facilitates disassembly and assembly. The cover has a certain axial length, so that the guide sleeve rod 6 can move stably under the support of the central through hole of the guide sleeve rod.
At the left end of sleeve 3, 8 right-hand member tip of screw rod are located inside sleeve 3, and this tip is equipped with contact nail 11, and the position with 11 right-hand member parallel and level of contact nail has the step on the sleeve 3 inner wall, and the step is used for keeping off and leads 6 left end baffles of loop bar and move left. Under the action of the contact nail 11, (1) when not stressed, the contact nail 11 is abutted against a baffle at the left end of the guide sleeve rod 6, so that the right end of the screw 8 is not shaken in the sleeve 3; (2) when the screw 8 is rotated, compared with surface contact, the contact pin 11 is in point contact with the baffle at the left end of the guide sleeve rod 6, so that friction force can be reduced.
As for the specific arrangement mode that the right end of the screw 8 is located inside the sleeve 3, the following can be implemented: the right end of the screw rod 8 extends into a central through hole of a left side plate of the sleeve 3 and penetrates through an inner ring of the bearing 12 to realize interference connection, and a fixing part for fixing the position of the bearing 12 is arranged on the screw rod 8; the screw 8 is provided with a nut 13 abutting against the left end of the left side plate of the sleeve 3.
On one hand, the bearing 12, the left support 14, the screw 8 and the fixing part form a structure equivalent to a screw-screw structure, so that the measurement distance is convenient to adjust, when the screw 8 rotates, the left support 14 moves leftwards or rightwards, and when the left support 14 drives the sleeve 3 to move leftwards, the bearing 12 bears axial force. The outer ring of the bearing 12 is in interference connection with the inner wall of the sleeve 3, and the position of the bearing is fixed between the left side plate of the sleeve 3 and the fixed part; the fixed part is a screw shaft shoulder 9 connected to the right end of the screw 8 through internal threads, and a gasket 10 is further arranged between the screw shaft shoulder 9 and the bearing 12. In practical applications, the bearing 12 may be a tapered roller bearing.
The nut 13 fixes the position of the left end of the sleeve 3 on the one hand and on the other hand by rotating it by means of a socket wrench to turn the screw 8 to achieve the adjustment of the measuring gap.
In the inside of sleeve 3, 6 left end baffles of guide pin bushing pole have the ring channel that blocks the spring 7 left end, avoid spring 7 to move with disorder, specifically can set up like this: the baffle at the left end of the guide sleeve rod 6 is annular as a whole, one circle of the baffle is lost at the edge of the outer ring for clamping the left end of the spring 7, the part of the outer ring which is not lost is attached to the inner wall of the sleeve 3, and the inner ring is in threaded connection with the guide sleeve rod 6; the outer ring of the spring 7 is attached to the inner wall of the sleeve 3.
The guide sleeve rod 6 is provided with an opening for accommodating the pressure sensor 5 in the axial direction, the pressure sensor 5 can move left and right in the opening, and two ends of the pressure sensor extending out of the opening are connected with the right end of the spring 7. For example, as shown in fig. 3, the pressure sensor 5 is a square block, the opening is a square hole, when the device is stressed by a tightening force, the pressure sensor 5 moves due to the axial force, and finally the right side of the two ends extending out of the opening abuts against the right side plate of the sleeve 3.
Based on the disclosure of the above embodiments, in still another embodiment of the present invention, the measuring device further includes an automatic structure for processing the pressure signal collected by the pressure sensor 5, and calculating and displaying the corresponding clamping force P. The method specifically comprises the following steps: the measurement device includes a data input interface for inputting a viewport reading, which is input between measurements. The data processing end specifically comprises a processor and a display 16, wherein the processor is used for processing a pressure signal from the pressure sensor 5 to obtain a corresponding pressure value, substituting the pressure value and an input reading of the observation port into a prestored calculation formula to obtain the clamping force between the two force measuring contact ends 19, and controlling the display 16 to display the clamping force in real time.
As for the scale on the position viewing port 15, for x0As a parameter in x + Δ x, it may be to display x0Δ x may also be displayed. Considering that x is a known fixed value, the latter display mode is preferably adopted from the viewpoint of intuition and easy understanding, namely, the scale on the position observation port 15 displays the initial distance point and the adjustment amount compared with the initial distance point, and accordingly, the data input interface is used for inputting the adjustment amount.
In practice, the display 16 may be embodied as a nixie tube, and the measuring device further comprises a power supply for supplying power to the pressure sensor 5, the processor and the display 16, and a protective casing 20 for internally housing the sleeve 3, the processor and the power supply. The nixie tube is arranged on the front cover of the protective shell, and a key for inputting the reading of the observation port is arranged beside the nixie tube; the keys are divided into an increase key and a decrease key, when the two keys are pressed simultaneously, the adjustment quantity input mode is entered, the adjustment quantity delta x is entered by increasing and decreasing the keys, the numerical value of the adjustment quantity delta x is displayed on the nixie tube, when the adjustment quantity input is completed, the two keys are pressed simultaneously again, the operation is ended, the normal mode is entered, and the clamping force measurement is started.
The technical solution provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (9)

1. A variable-pitch automatic door clamping force measuring device is characterized by comprising a sleeve (3), a screw rod (8) with the right end arranged in a central through hole of a left side plate of the sleeve (3) and capable of rotating, a guide sleeve rod (6) which is arranged in the central through hole of a right side plate of the sleeve (3) in a penetrating way and capable of moving left and right, a spring (7) and a pressure sensor (5) which are arranged between a left end baffle of the guide sleeve rod (6) and the right side plate of the sleeve (3) in sequence, a data processing end connected with the pressure sensor (5) and used for receiving and processing pressure signals, a left support (14) and a right support (2) respectively arranged at the left end of the screw rod (8) and the right end of the guide sleeve rod (6), and front and back two symmetrical force-measuring contact ends (19) hinged between the left support (14) and the right support (2) through four connecting rods (17);
the four connecting rods (17) are equal in length; the left support (14) is in threaded connection with the screw (8), a transparent position observation port (15) is formed in the left end of the left support (14), and a reading comparison point is arranged at a position, corresponding to the position observation port (15), on the screw (8); the scales on the position observation port (15) represent 0.5 time of the horizontal distance between the rotating centers of the two ends of the left connecting rod (17) and the right connecting rod (17);
when the device is used, the position of the left support (14) on the screw rod (8) is adjusted by rotating the screw rod, so that the measurement gap between the front force measurement contact end and the rear force measurement contact end (19) is adjusted.
2. The device according to claim 1, characterized in that the right end of the screw rod (8) extends into the central through hole of the left side plate of the sleeve (3) and passes through the inner ring of the bearing (12) to realize interference connection, and a fixing part for fixing the position of the bearing (12) is arranged on the screw rod (8); and a nut (13) which is close to the left end of the left side plate of the sleeve (3) is arranged on the screw rod (8).
3. The device according to claim 1, characterized in that the right end of the screw (8) is located inside the sleeve (3) and is provided with a contact pin (11), and the inner wall of the sleeve (3) is provided with a step at a position flush with the right end of the contact pin (11), and the step is used for blocking the left baffle of the guide sleeve rod (6) from moving to the left.
4. The device as claimed in claim 1, characterized in that the baffle at the left end of the guide sleeve rod (6) is provided with an annular groove for clamping the left end of the spring (7), and the guide sleeve rod (6) is provided with an opening for accommodating the pressure sensor (5) on the rod body; the pressure sensor (5) can move left and right in the opening, and two ends of the pressure sensor extending out of the opening are connected with the right end of the spring (7).
5. The device according to claim 1, characterized in that it further comprises a data input interface for inputting a reading of the position observation port (15), said data processing terminal comprising a processor and a display (16), said processor being adapted to process the pressure signal from said pressure sensor to obtain a corresponding pressure value, to substitute said pressure value, said input reading of the position observation port (15) into a pre-stored calculation formula to obtain the clamping force between said two force contact terminals (19), and to control said display (16) to display said clamping force.
6. The apparatus of claim 5, wherein the scale on the position viewport (15) displays an initial distance point and an adjustment amount to be made in comparison with the initial distance point, and wherein the data input interface is configured to input the adjustment amount, wherein the increment is positive and the decrement is negative.
7. The apparatus of claim 5, further comprising a power source for powering the pressure sensor (5), the processor, and the display (16).
8. The device according to claim 7, characterized in that it further comprises a protective casing (20) internally fitting said sleeve (3), said processor and said power supply.
9. The device as claimed in claim 1, characterized in that the right end of the loop-guiding rod (6) is provided with a handle (1).
CN201811464636.6A 2018-12-03 2018-12-03 Clamping force measuring device of variable-pitch automatic door Active CN109506824B (en)

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