CN210270631U - Force control testing equipment - Google Patents

Abstract

The utility model discloses a power control test equipment, including linear electric motor, test head and motion control ware, linear electric motor includes active cell and stator, and the active cell links to each other with the stator suspension through suspension direction subassembly, and the test head is connected in active cell one end, and linear electric motor is connected with the motion control ware electricity, and the motion control ware passes through the input current control linear electric motor of control linear electric motor to the drive power of active cell, and the test head is with this drive power output. The utility model discloses a suspension setting of linear electric motor active cell, the active cell can be by zero friction drive, makes force control equipment can provide stable accurate test pressure, does not include among the linear electric motor low friction linear slide rail, and cancelled high accuracy pressure sensor's use through current control output pressure, practices thrift the cost, improves linear electric motor life, is favorable to large-scale input production.

Description

Force control testing equipment

Technical Field

The utility model relates to an electronic manufacturing technical field, concretely relates to force control test equipment.

Background

With the progress of society and the development of technology, electronic products with touch screens, touch keys, fingerprint keys or buttons are increasingly going into people's lives, for example: smart phones, tablet computers, smart watches, integrated desktop computers, and the like. In the prior art, force control testing equipment is usually adopted to simulate the touch action of a user to operate a 3C product, in order to meet the requirement of force control, parts such as a sensor and a grating ruler are usually matched, and the pressure generated by the downward pressing of a knocking head is fed back by a pressure sensor to a motion controller of a driving mechanism to form a force closed loop; the distance of the downward movement of the knocking head is fed back to a motion controller of the driving mechanism by a grating ruler to form a position ring.

In order to ensure the accuracy and stability of the testing force, the force control testing equipment generally needs a pressure sensor and a grating ruler with high accuracy and high sensitivity, and meanwhile, the friction of a driving mechanism is reduced as much as possible, however, even a linear motor with a small friction coefficient in the prior art cannot completely solve the problem of the friction coefficient, and the high-accuracy sensor and the low-friction linear slide rail are high in cost and low in service life, so that the force control testing equipment is not beneficial to large-scale production.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a can provide stable accurate test pressure and with low costs, long service life's power accuse test equipment.

In order to solve the technical problem, the utility model provides a power control test equipment, including linear electric motor, test head and motion control ware, linear electric motor includes active cell and stator, the active cell links to each other with the stator suspension through the suspension direction subassembly, the test head connect in active cell one end, linear electric motor with the motion control ware electricity is connected, motion control ware passes through the drive power of control linear electric motor's input current control linear electric motor to the active cell, the test head is with this drive power output.

Furthermore, the suspension guide assembly is a magnetic suspension bearing, the magnetic suspension bearing is arranged at two ends of the stator, the rotor penetrates through the magnetic suspension bearing, and the magnetic suspension bearing is electrically connected with the motion controller.

Further, the linear motor is a cylindrical linear motor, the stator comprises a stator core and a stator coil arranged in the stator core, the rotor comprises a rotor main shaft and a rotor magnetic pole which are fixedly connected, the rotor magnetic pole is located in the range of the stator coil, and the rotor main shaft penetrates through the magnetic suspension bearing.

Furthermore, the suspension guide assembly is an air-flotation guide rail, and the rotor is suspended on the air-flotation guide rail.

Further, the linear motor is a flat linear motor, the air-floating guide rails are arranged on two sides of the stator, and two sides of the mover are suspended on the air-floating guide rails.

Furthermore, the other end of the rotor is connected with a grating ruler, the grating ruler is electrically connected with the motion controller, and the stator, the rotor and the grating ruler are arranged in the shell of the linear motor.

Furthermore, the test head pass through the installation department with the active cell links to each other, the test head is easy-to-break formula structure.

Furthermore, the testing head is of a dumbbell-shaped structure, and the middle of the dumbbell-shaped testing head is an easy-breaking point.

Furthermore, the test head is of a conical structure, and the top end of the conical test head is an easy-breaking point.

A method of operating a force controlled test device, comprising the steps of:

s01: performing early-stage correction, placing a precision pressure sensor below a test head to detect the output pressure of the test head, and controlling the input current of a linear motor by a motion controller;

s02: removing the precision pressure sensor, and acquiring the relation between the input current and the output pressure according to the relation between the input current and the driving force of the linear motor;

s03: obtaining input current according to required test pressure, and controlling and inputting the current through a motion controller;

s04: the product is monitored for feedback at this pressure.

The utility model discloses a beneficial effect that power accuse test equipment compares with prior art is, through the suspension setting of linear electric motor active cell, the active cell can be driven by zero friction, makes power accuse equipment can provide stable accurate test pressure, does not include among the linear electric motor low friction linear slide rail, and cancelled high accuracy pressure sensor's use through current control output pressure, practices thrift the cost, improves linear electric motor life, is favorable to large-scale input production.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;

fig. 2 is a schematic view of an internal structure of a linear motor according to an embodiment of the present invention;

fig. 3 is a schematic view of a test head structure according to an embodiment of the present invention.

Detailed Description

The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.

Referring to fig. 1, for the embodiment of the force control testing apparatus of the present invention, the testing apparatus in this embodiment includes linear electric motor 10, testing head 20 and motion controller 30, and thus motion controller 30 controls linear electric motor 10 to drive testing head 20 to move so as to make testing head 20 contact with the product to be tested and apply the testing pressure to it, linear electric motor 10 includes runner 11 and stator 12, when stator 12 winding lets in alternating current power supply, just produces the travelling wave magnetic field in the air gap, and runner 11 will induce the electromotive force and produce the electric current under the cutting of travelling wave magnetic field, and this electric current and the magnetic field in the air gap interact just produces electromagnetic thrust. In the case that the stator 12 is fixed, the mover 11 makes a linear motion under the thrust action, and in order to ensure that the mover 11 moves along the direction of the stator 12 without deviation, a linear slide rail is provided in the prior art, and the mover 11 is connected to the linear slide rail, so that the output accuracy of the linear motor 10 is affected due to friction between the mover 11 and the linear slide rail. Therefore, in the present embodiment, the mover 11 is connected to the stator 12 in a floating manner through the floating guide assembly 40, and since the mover 11 is completely floating, the mover 11 has no friction during moving, and the electromagnetic thrust F for pushing the mover 11 to move can be completely output. The test head 20 is connected to one end of the mover 11, the test head 20 moves along with the mover 11, when the test head 20 abuts against a product to be tested, the mover 11 cannot move continuously, and because the mover 11 does not receive any friction force, when the mover 11 is stationary, the electromagnetic thrust F for pushing the mover 11 to move is the same as the thrust F' received by the product. The electromagnetic thrust is determined by the current led into the winding of the stator 12, in order to control the output force, the linear motor 10 is electrically connected with the motion controller 30, the motion controller 30 controls the driving force of the linear motor 10 to the rotor 11 by controlling the input current of the linear motor 10, and the test head 20 outputs the driving force to act on the product to be tested. Because the input current can be accurately controlled, stable and accurate testing force can be provided for a product to be tested, and meanwhile, the force closed-loop control can be realized without using a high-precision pressure sensor. Referring to fig. 2, in the present embodiment, the suspension guide assembly 40 is a magnetic suspension bearing 41, the magnetic suspension bearing 41 is disposed at two ends of the stator 12, the mover 11 passes through the magnetic suspension bearing 41, the magnetic suspension bearing 41 is electrically connected to the motion controller 30, the motion controller 30 generates a control current according to a set control strategy, and drives the magnetic suspension bearing 41 to generate a corresponding electromagnetic force to achieve suspension of the mover 11, because the magnetic suspension bearing 41 is suitable for a shaft-type workpiece, in the present embodiment, the linear motor 10 is selected to be a cylindrical linear motor 10, the stator 12 includes a stator core 13 and a stator coil 14 disposed therein, the magnetic suspension bearing 41 is disposed at two ends of the stator core 13, the mover 11 includes a mover spindle 15 and a mover magnetic pole 16 that are fixedly connected, in the present embodiment, to reduce the mass of the mover 11 and ensure that the electromagnetic force applied to the mover 11 is, thereby ensuring that the force output by the linear motor 10 is stable and accurate, the mover magnetic poles 16 are located within the range of the stator coils 14, and the mover spindle 15 passes through the magnetic suspension bearing 41. The rotor spindle 15 is completely suspended, high cost of high-precision sensors and low-friction linear sliding rails is saved, the service life is long, and large-scale production is facilitated.

When the test equipment of this embodiment is used to provide downward pressure, because the mover 11 and the test head 20 have a certain weight, the pressure acting on the product to be tested is the sum of the electromagnetic thrust received by the mover 11 and the weight of the mover 11 and the test head 20, and in order to determine how much current needs to be applied to meet the force required by the test at this time, the force control test equipment needs to be corrected before the test, the correction method is to arrange a high-precision pressure sensor below the test head 20, apply current to push the test head 20 to press downward, the pressure signal detected by the pressure sensor is the pressure received by the product to be tested, when the pressure reaches a set value, the motion controller 30 controls to stop increasing the current applied to the linear motor 10, the electromagnetic thrust output by the linear motor 10 at this current is F, the pressure received by the product to be tested is F', and the gravity of the mover 11 and the test head 20 is G, f' ═ F + G, can confirm the size of the electric current that need provide when the product that awaits measuring receives different pressure through once maring, high accuracy pressure sensor only uses once, does not use pressure sensor during the test. In one embodiment, the method of operation of the force controlled test device comprises the steps of: s01: performing early-stage correction, placing a precision pressure sensor below the test head 20 to detect the output pressure of the test head 20, and controlling the input current of the linear motor 10 by the motion controller 30; s02: removing the precision pressure sensor, and acquiring the relation between the input current and the output pressure according to the relation between the input current and the driving force of the linear motor 10; s03: obtaining an input current according to a required test pressure, and controlling the input current through the motion controller 30; s04: the product is monitored for feedback at this pressure. In another embodiment, the floating guide assembly 40 is an air-floating guide rail, the mover 11 is suspended on the air-floating guide rail, so that the smooth movement of the mover 11 without friction and vibration is realized, the driving force of the linear motor 10 on the mover 11 is completely applied to the product to be measured, and the driving force of the linear motor 10 on the mover 11 can be accurately controlled, so as to realize the purpose of providing stable and accurate pressure to the product to be measured. The levitation guide assembly 40 of the present embodiment is also applicable to the flat type linear motor 10, wherein the air-floatation guide rails are disposed on both sides of the stator 12, and both sides of the mover 11 are levitated on the air-floatation guide rails. The length of the linear motor 10 is reduced, and the linear motor is convenient to install.

Refer to fig. 3, be the utility model discloses a test head 20 embodiment a structure schematic diagram, test head 20 pass through installation department 21 with active cell 11 links to each other, makes things convenient for test head 20's loading and unloading, test head 20 is the breakable formula structure, and when the pressure of linear electric motor 10 output was greater than the pressure that the product that awaits measuring can bear, test head 20 broke earlier, and there is certain distance between fracture part and product this moment, and test head 20 part after the fracture promptly does not contact with the product to form the protection to the product. In this embodiment, the test head 20 has a dumbbell-shaped structure, and the middle of the dumbbell-shaped structure has a diameter smaller than that of the two ends, so that the middle of the test head 20 is an easy-to-break point. Further, the mover 11 is not affected by friction, so that the response speed of the mover 11 is high, the sensitivity is high, in order to prevent the mover 11 from continuously moving downwards to contact with a product after the test head 20 is broken, the other end of the mover spindle 15 is further connected with a grating ruler 17, the grating ruler 17 is electrically connected with the motion controller 30, when the grating ruler 17 detects that the motion of the mover 11 exceeds the range, the motion controller 30 immediately stops driving the linear motor 10, the mover 11 is prevented from being overpressured again, and secondary protection of the product is formed. The stator 12, the rotor 11 and the grating ruler 17 are arranged in the shell of the linear motor 10, the grating ruler 17 is designed and integrated in the linear motor 10, the performance of the grating ruler 17 is prevented from being polluted by external pollution factors, and the service life of the grating ruler 17 is prolonged.

In other embodiments, the test head 20 may also be a cone-shaped structure, and the end point of the cone-shaped test head 20 is a break point. The contact surface of the test head 20 and a product is large, the size of the breakable point is small to meet the requirement of breaking, and the conical test head 20 is not easy to displace after being broken in the pressing process, so that the broken part can be prevented from directly contacting with the product, and the product is protected.

The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.

Claims (9)

1. The force control testing equipment is characterized by comprising a linear motor, a testing head and a motion controller, wherein the linear motor comprises a rotor and a stator, the rotor is connected with the stator in a suspension mode through a suspension guide assembly, the testing head is connected to one end of the rotor, the linear motor is electrically connected with the motion controller, the motion controller controls the driving force of the linear motor on the rotor through controlling the input current of the linear motor, and the testing head outputs the driving force.

2. The force control testing apparatus of claim 1, wherein the suspension guide assembly is a magnetic suspension bearing disposed at both ends of the stator, the mover passes through the magnetic suspension bearing, and the magnetic suspension bearing is electrically connected to the motion controller.

3. The force control test device of claim 2, wherein the linear motor is a cylindrical linear motor, the stator includes a stator core and a stator coil disposed therein, the mover includes a fixedly coupled mover main shaft and mover magnetic poles, the mover magnetic poles are located within the stator coil, and the mover main shaft passes through the magnetic suspension bearing.

4. The force control test apparatus of claim 1, wherein the levitating guide assembly is an air bearing guide, and the mover is levitated on the air bearing guide.

5. The force control test apparatus of claim 4, wherein the linear motor is a flat linear motor, the air-float guide is disposed on two sides of the stator, and two sides of the mover are suspended on the air-float guide.

6. The force control test device according to claim 1, wherein a grating ruler is connected to the other end of the mover, the grating ruler is electrically connected to the motion controller, and the grating ruler is disposed in the housing of the linear motor.

7. The force control test apparatus of claim 1, wherein the test head is coupled to the mover by a mounting portion, the test head being of a frangible construction.

8. The force control test device of claim 7, wherein said test head is of a dumbbell-shaped configuration, said dumbbell-shaped test head having a break-away point at a central location thereof.

9. The force control test device of claim 7, wherein said test head is of a conical configuration, said conical test head being positioned at a break-off point at a top end thereof.

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