CN111251212B

CN111251212B - Pressure sensor manufacturing process

Info

Publication number: CN111251212B
Application number: CN202010109479.8A
Authority: CN
Inventors: 不公告发明人
Original assignee: Wenzhou Hongteng Technology Co ltd
Current assignee: WENZHOU HONGTENG TECHNOLOGY Co.,Ltd.
Priority date: 2020-02-22
Filing date: 2020-02-22
Publication date: 2020-10-23
Anticipated expiration: 2040-02-22
Also published as: CN111251212A

Abstract

The invention relates to a pressure sensor manufacturing process. The method comprises the following steps: loading a circuit board to be processed on a clamp and enabling the front side of the circuit board to face upwards; processing the front side of the circuit board; overturning the circuit board to enable the back of the circuit board to face upwards; processing the back of the circuit board; the method for turning over the circuit board is to rotate the clamp. The manufacturing process provided by the invention can realize the turnover of the circuit board by rotating the clamp, so that the front side and the back side of the circuit board can be respectively processed, the processes of disassembling and reloading the circuit board are not needed, the production flow can be simplified, the processing time is saved, and the production efficiency is improved.

Description

Pressure sensor manufacturing process

Technical Field

The invention relates to a pressure sensor manufacturing process.

Background

The pressure sensor is the most common sensor in industrial practice, is widely applied to various industrial automatic control environments, and relates to a plurality of industries such as water conservancy and hydropower, railway traffic, intelligent buildings, production automatic control, aerospace, military industry, petrochemical industry, oil wells, electric power, ships, machine tools, pipelines and the like. For example, in the pressure sensor disclosed in chinese patent application publication CN110501110A, the front and back of the circuit board are both provided with MEMS sensing elements, and the front and back of the circuit board need to be processed during the production process. In the conventional manufacturing process, after the front surface of the circuit board is machined, the circuit board needs to be detached from the clamp, turned over so that the back surface of the circuit board faces upwards, and then reloaded in the clamp so as to machine the back surface of the circuit board. This production process not only needs to expend time, influences production efficiency, and the operation of dismouting circuit board is difficult to adopt mechanical automatic equipment to accomplish moreover, has increased the difficult way of intelligent realization.

Disclosure of Invention

The invention aims to provide a pressure sensor manufacturing process, which comprises the following steps: loading a circuit board to be processed on a clamp and enabling the front side of the circuit board to face upwards; processing the front side of the circuit board; overturning the circuit board to enable the back of the circuit board to face upwards; processing the back of the circuit board; the method for turning over the circuit board is to rotate the clamp.

The manufacturing process provided by the invention can realize the turnover of the circuit board by rotating the clamp, so that the front side and the back side of the circuit board can be respectively processed, the processes of disassembling and reloading the circuit board are not needed, the production flow can be simplified, the processing time is saved, and the production efficiency is improved.

Drawings

FIG. 1 shows a schematic process flow diagram of the present invention;

FIG. 2 shows a schematic of the structure of the conveyor line;

FIG. 3 shows a top view of the base, the clamp and the circuit board loaded on the clamp;

FIG. 4 shows an enlarged view of part A of FIG. 3;

FIG. 5 is a perspective view showing the base, the jig, and the circuit board loaded on the jig;

FIG. 6 is an exploded perspective view of the base, the clamp and the circuit board loaded on the clamp;

FIG. 7 is a perspective view showing the jig and the circuit board loaded on the jig;

FIG. 8 shows a perspective view of another angle of the fixture and the circuit board loaded on the fixture;

FIG. 9 shows a cross-sectional view B-B of FIG. 7;

FIG. 10 shows an enlarged partial view of portion C of FIG. 9;

FIG. 11 shows an enlarged view of a portion D of FIG. 9;

FIG. 12 shows a perspective view of the clip separated from the circuit board;

fig. 13 is a schematic view showing the wiring board hidden from view in fig. 7;

FIG. 14 is a schematic view showing the wiring board hidden from view in FIG. 8;

FIG. 15 shows an exploded perspective view of the clamp;

FIG. 16 shows an exploded perspective view of another angle of the clamp;

FIG. 17 shows a top view of the clip with the front bezel portion of the frame hidden, all of the positive stops entering the receiving cavity;

FIG. 18 is a schematic view showing the front operating lever rotated to the forward rotation maximum position on the basis of FIG. 17 after all the front stoppers are removed from the receiving cavities;

FIG. 19 shows a bottom view of the clip with the back frame portion of the frame hidden and all back stops entering the receiving cavity;

FIG. 20 is a schematic view showing the back side lever rotated to the forward rotation maximum position to release all the back side stoppers from the receiving cavities on the basis of FIG. 19;

FIG. 21 shows a top view of the base, clamp, circuit board loaded on the clamp, and tumble drive mechanism with the dog clutch disengaged;

FIG. 22 shows a front view on the basis of FIG. 21;

FIG. 23 shows a schematic diagram of the motor driven translation to shift the dog clutch from a disengaged to an engaged state based on FIG. 22;

FIG. 24 shows a top view of the base, the clamp, the circuit board loaded on the clamp, and the rotation inhibiting mechanism with the piston rod of the cylinder withdrawn from the receptacle;

fig. 25 shows a schematic view after inserting the piston rod of the cylinder into the insertion hole on the basis of fig. 24;

fig. 26 is a plan view showing the base, the jig, the board loaded on the jig, and the moving cam, in which the jig has not reached the board loading station;

FIG. 27 shows a front view on the basis of FIG. 26;

fig. 28 is a schematic view showing the operation of urging the gripper in the conveying direction of the conveying line on the basis of fig. 26 and bringing the roller of the upward one of the front side operating lever and the rear side operating lever into proximity with the moving cam;

FIG. 29 shows an enlarged view of part E of FIG. 28;

fig. 30 to 32 are schematic views showing the jig being driven to move further in the conveying direction of the conveyor line and finally reaching the board loading station on the basis of fig. 29, in which fig. 30 shows the roller being in contact with the reverse rotation maximum position holding section, fig. 31 shows the roller being in contact with the inclined transition section, and fig. 32 shows the roller being in contact with the forward rotation maximum position holding section while the jig reaches the board loading station;

FIG. 33 shows a top view of the moving cam;

fig. 34 shows a perspective view of the moving cam.

Reference numerals:

10 conveyor lines, 101 slides, 102 rails, 103 conveyor belts, 104 spring top beads, 105 spring top bead beads;

20 clamp, 201 pin shaft, 202 frame, 203 accommodating cavity, 204 front frame part, 205 middle frame part, 206 back frame part, 207 first blocking surface, 208 second blocking surface, 209 third blocking surface, 210 fourth blocking surface, 211 concave groove and 212 jack;

30 circuit boards, 301 front sides of the circuit boards and 302 back sides of the circuit boards;

401 front joystick, 402 front chain, 403 front sprocket, 404 front dog, 405 front torsion spring;

501 back lever, 502 back chain, 503 back sprocket, 504 back stop, 505 back torsion spring;

60 motors, 601 half clutches and 602 guide mechanisms;

piston rods of 70 cylinders and 701 cylinders;

80 rollers;

90 moving cam, 901 reverse rotation maximum position holding section, 902 inclined transition section, 903 forward rotation maximum position holding section.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

The manufacturing process of the pressure sensor shown in fig. 1 comprises the following steps:

firstly, loading a circuit board 30 to be processed on a clamp 20 and enabling the front surface 301 of the circuit board to face upwards;

secondly, processing the front surface 301 of the circuit board, wherein the front surface of the circuit board is processed by adopting the prior art, and after the front surface of the circuit board is processed, at least a sensitive element and a conditioning chip are fixed on the front surface of the circuit board;

thirdly, the circuit board 30 is turned over so that the back surface 302 of the circuit board faces upwards;

fourthly, processing the back surface 302 of the circuit board, wherein the processing of the back surface of the circuit board adopts the prior art, and after the processing of the back surface of the circuit board is finished, at least a sensitive element and a conditioning chip are fixed on the back surface of the circuit board;

among them, the method of turning over the wiring board 30 is to rotate the jig 20.

A base is provided, a clamp 20 is rotatably mounted on the base, and the clamp 20 can be rotated to selectively enable the front surface 301 of the circuit board or the back surface 302 of the circuit board to face upwards.

According to the technical scheme, the circuit board can be turned by rotating the clamp, so that the front side and the back side of the circuit board can be conveniently processed respectively, the processes of disassembling and reloading the circuit board are not needed, the production flow can be simplified, the processing time is saved, and the production efficiency is improved.

Providing a conveyor line for transporting the foundation, in particular, the foundation is mounted on the conveyor line 10 and is transported by the conveyor line 10;

a circuit board loading station, a circuit board front processing station, a circuit board overturning station, a circuit board back processing station and a circuit board unloading station are sequentially arranged along the conveying direction of the conveying line;

the circuit board loading station is used for loading a circuit board to be processed on the clamp and enabling the front side of the circuit board to face upwards;

the front processing station of the circuit board is used for processing the front of the circuit board;

the circuit board overturning station is used for overturning the circuit board;

the circuit board back processing station is used for processing the back of the circuit board;

the circuit board unloading station is used for completing the unloading of the circuit board from the clamp.

As shown in fig. 2 to 20, the base includes two sliders 101; the conveyor line 10 comprises two parallel guide rails 102, each slide carriage 101 is slidably mounted on one guide rail 102, and each guide rail 102 is in a track shape to realize a circulating operation. A sliding driving mechanism for driving the sliding base 101 to move may be provided in the inner guide rail 102. The slip drive mechanism comprises a mesh-type belt 103, the carriage 101 being fixed relative to the belt 103, whereby the carriage 101 is moved when the belt 103 is running.

The clamp 20 is provided with two pin shafts 201, the clamp 20 rotates around the axis of the pin shaft 201, the axis of the pin shaft 201 is parallel to the front surface 301 of the circuit board clamped on the clamp 20, in this embodiment, the two pin shafts 201 are separated from two sides of the clamp 20, the axes of the two pin shafts 201 are coincident, and each pin shaft 201 is rotatably mounted on a sliding seat 101 through a bearing;

the clamp 20 comprises a frame 202, wherein the frame 202 encloses a containing cavity 203 for containing the circuit board 30;

a front blocking mechanism and a back blocking mechanism are arranged on the frame 202;

the front blocking mechanism includes a front operating lever 401, a front chain 402 and a plurality of front rotating assemblies spaced around the receiving cavity 203, the front chain 402 being shown in phantom in fig. 17 and 18;

each front rotating assembly comprises a front rotating shaft 403, a front chain wheel 404 and a front stop block 405, the front rotating shaft 403 is rotatably mounted on the frame 202, the front chain wheel 404 and the front stop block 405 are fixed in the front rotating shaft 403, the front stop block 405 extends along the radial direction of the front rotating shaft 403, and the front stop block 405 can selectively enter or leave the accommodating cavity 203 to block or allow the circuit board 30 to enter or leave the accommodating cavity 203 when the front rotating shaft 403 rotates;

the front chain 402 is meshed with all front chain wheels 404 to drive all front rotating shafts 403 to synchronously rotate, the axes of all the front rotating shafts 403 are parallel to each other, one end of the front operating lever 401 is a fixed end, the other end of the front operating lever is a free end, the fixed end of the front operating lever 401 is fixed on one front rotating shaft 403, the front operating lever 401 extends along the radial direction of the front rotating shaft 403, in the embodiment, the front operating lever is driven to rotate by acting on the free end of the front operating lever, the front rotating shaft fixed with the front operating lever can rotate along with the front operating lever, and the other front rotating shafts are driven to synchronously rotate by the meshing transmission of the front chain and each front chain wheel;

the back blocking mechanism comprises a back operating lever 501, a back chain 502 and a plurality of back rotating assemblies spaced around the receiving cavity 203, the back chain 502 being shown in phantom in fig. 19 and 20; in this embodiment, the frame 202 is in a square frame shape, and a set of front rotating components and a set of back rotating components are disposed at four corners of the frame, that is, at least four sets of the front rotating components and the back rotating components are disposed at the four corners of the frame. The front rotary assembly and the back rotary assembly are six groups;

each back rotating assembly comprises a back rotating shaft 503, a back sprocket 504 and a back stopper 505, the back rotating shaft 503 is rotatably mounted on the frame 202, the back sprocket 504 and the back stopper 505 are fixed in the back rotating shaft 503, the back stopper 505 extends along the radial direction of the back rotating shaft 503, and the back stopper 505 selectively enters or leaves the accommodating cavity 203 to block or allow the circuit board 30 to enter or leave the accommodating cavity 203 when the back rotating shaft 503 rotates;

the back chain 502 is meshed with all back chain wheels 504 to make each back rotating shaft 503 rotate synchronously, the axes of all back rotating shafts 503 are parallel to each other, one end of the back operating lever 501 is a fixed end, the other end is a free end, the fixed end of the back operating lever 501 is fixed on one back rotating shaft 503, the back operating lever 501 extends along the radial direction of the back rotating shaft 503, in the embodiment, the back operating lever is driven to rotate by acting on the free end of the back operating lever, the back rotating shaft fixed with the back operating lever rotates along with the back operating lever, and the other back rotating shafts are driven to rotate synchronously by the meshed transmission of the back chain and each back chain wheel;

all the front stoppers 405 are at the same height to form a front stopper layer, and all the back stoppers 505 are at the same height to form a back stopper layer, and the distance between the front stopper layer and the back stopper layer is equal to the thickness of the circuit board 30, so that the circuit board 30 entering the housing chamber 203 is clamped between all the front stoppers 405 entering the housing chamber 203 and all the back stoppers 505 entering the housing chamber 203.

The circuit board is realized clamping by the fixture disclosed by the technical scheme through setting the front blocking mechanism and the back blocking mechanism, and the front blocking mechanism and the back blocking mechanism can independently abut against and loosen the circuit board, so that the circuit board can be conveniently detached and loaded whether the front blocking mechanism faces upwards or the back blocking machine faces upwards. Each front rotating assembly and each back rotating assembly respectively adopt chain transmission to realize that each front stop dog and each back stop dog can synchronous motion, simple structure, the operation of being convenient for. In this embodiment, the front lever and the back lever may be driven to rotate manually or mechanically automatically, so as to drive the front block and the back block to rotate.

As shown in fig. 10 and 11, each front stopper 405 entering the housing cavity 203 abuts against one of the front surface 301 and the back surface 302 of the circuit board entering the housing cavity, and each back stopper 505 entering the housing cavity 203 abuts against the other of the front surface 301 and the back surface 302 of the circuit board entering the housing cavity 203.

In this embodiment, the front sprocket and the front stopper of each front rotating assembly are integrated, and the back sprocket and the back stopper of each back rotating assembly are integrated, and this technical scheme can save the inner space of the fixture.

In the present embodiment, the frame 202 is composed of a front frame portion 204, a middle frame portion 205, and a rear frame portion 206.

The front frame cover is arranged on the front surface of the middle frame. In each of the front rotary shafts except the front rotary shaft fixed to the front joystick, the other end of the front rotary shaft is rotatably mounted on the middle frame portion, and one end of the front rotary shaft is rotatably mounted on the front frame portion. The other end of the front rotating shaft fixed with the front operating lever is rotatably arranged on the middle frame part, one end of the front rotating shaft fixed with the front operating lever penetrates through the front frame part and extends out of the front frame part, and the fixed end of the front operating lever is actually fixed at one end of the front rotating shaft penetrating through the front frame part and extending out of the front frame part. The front control lever is driven to rotate by acting on the free end of the front control lever, the front rotating shaft fixed with the front control lever rotates along with the front control lever, and the other front rotating shafts are driven to synchronously rotate by the meshing transmission of the front chain and each front chain wheel. The front frame portion can cover the front sprocket and the front chain.

The back frame cover is arranged on the back of the middle frame. In each of the other back rotary shafts except the back rotary shaft fixed to the back operation lever, one end of the back rotary shaft is rotatably mounted on the middle frame portion, and the other end of the back rotary shaft is rotatably mounted on the back frame portion. One end of the back rotating shaft fixed with the back operating lever is rotatably arranged on the middle frame part, the other end of the back rotating shaft fixed with the back operating lever penetrates through the back frame part and extends out of the back frame part, and the fixed end of the back operating lever is actually fixed at the other end of the back rotating shaft penetrating through the back frame part and extending out of the back frame part. The back operating lever is driven to rotate by acting on the free end of the back operating lever, the back rotating shaft fixed with the back operating lever rotates along with the back operating lever, and the rest back rotating shafts are driven to synchronously rotate by the meshing transmission of the back chain and each back chain wheel. The rear frame portion can cover the rear sprocket and the rear chain.

A front limiting mechanism for rotating the front joystick 401 back and forth between a maximum forward rotation position and a maximum reverse rotation position is provided on the frame 202, wherein fig. 17 shows the front joystick 401 in the maximum reverse rotation position, and fig. 18 shows the front joystick 401 in the maximum forward rotation position;

all the front stoppers 405 leave the accommodating cavity 203 when the front joystick 401 is in the forward rotation maximum position, and all the front stoppers 405 enter the accommodating cavity 203 when the front joystick 401 is in the reverse rotation maximum position;

a front elastic reset mechanism which enables the front control lever 401 to have the tendency of returning to the maximum reversal position is arranged between the frame 202 and the front control lever 401;

the frame 202 is further provided with a back limiting mechanism for rotating the back joystick 501 back and forth between a maximum forward rotation position and a maximum reverse rotation position, wherein fig. 19 shows the back joystick 501 at the maximum reverse rotation position, and fig. 20 shows the back joystick 501 at the maximum forward rotation position;

all the back stoppers 505 leave the accommodating chamber 203 when the back lever 501 is at the forward rotation maximum position, and all the back stoppers 505 enter the accommodating chamber 203 when the back lever 501 is at the reverse rotation maximum position;

a back elastic return mechanism is provided between the frame 202 and the back lever 501 to return the back lever 501 to the maximum reverse position. This technical scheme restricts the rotation range of front control rod and back control rod through setting up front stop gear and back stop gear to in operation avoids misoperation. The front elastic reset mechanism and the back elastic reset mechanism are arranged to enable the front operating rod and the back operating rod to reset after the acting force applied to the front operating rod and the back operating rod is removed.

In this embodiment, the front limiting mechanism rotates the front joystick within a predetermined angular range, and the back limiting mechanism rotates the back joystick within a predetermined angular range.

The front limiting mechanism comprises a first blocking surface 207 and a second blocking surface 208 which are arranged in the rotating direction of a front control lever 401, the front control lever 401 is in the maximum forward rotation position when abutting against the first blocking surface 207, and the front control lever 401 is in the maximum reverse rotation position when abutting against the second blocking surface 208;

the back limiting mechanism comprises a third blocking surface 209 and a fourth blocking surface 210 which are arranged in the rotating direction of the back control lever 501, the back control lever 501 is at the maximum forward rotation position when abutting against the third blocking surface 209, and the back control lever 501 is at the maximum reverse rotation position when abutting against the fourth blocking surface 210;

the front elastic reset mechanism includes a front torsion spring 406 sleeved outside the front rotating shaft 403 fixed to the front operating lever 401, one elastic leg of the front torsion spring 406 is fixed to the frame 202 (especially to the front frame 204), and the other elastic leg of the front torsion spring 406 is fixed to the front operating lever 401;

the back elastic return mechanism includes a back torsion spring 506 sleeved outside a back rotating shaft 503 fixed to the back operating lever 501, one elastic leg of the back torsion spring 506 is fixed to the frame 202 (especially, to the back frame portion 206), and the other elastic leg of the back torsion spring 506 is fixed to the back operating lever 501.

The base is provided with a spring top bead 104, in this embodiment, the spring top bead 104 is fixedly mounted in the base by a sliding seat 101;

the frame 202 is provided with a recess 211 into which the bead 105 of the spring loaded bead is recessed.

This technical scheme can restrict anchor clamps free rotation and allow anchor clamps to force to rotate through setting up spring top pearl, reduces the risk that anchor clamps accidentally deflect in the transportation process along the transfer chain, improves the reliability and the stability of anchor clamps work.

As shown in fig. 21 to 23, the transfer line has a circuit board inverting station provided with an inverting drive mechanism for driving the jig 20 to rotate to invert the circuit board 30 held on the jig 20.

This technical scheme is through setting up upset actuating mechanism in order not to need the manual work to rotate, saves the labour.

The tumble drive mechanism includes a motor 60;

a jaw clutch is arranged between the output shaft of the motor 60 and the pin 201, one half clutch 601 of the jaw clutch is fixed on the output shaft of the motor 60, and the other half clutch 601 is fixed on the pin 201;

the axis of the pin shaft 201 is overlapped with the axis of the output shaft of the motor 60 when the clamp 20 reaches the circuit board overturning station;

the circuit board overturning station is also provided with a translation driving mechanism (not shown in the figure) for driving the motor 60 to translate along the axial direction of an output shaft of the motor so as to enable the jaw clutch to be selectively separated or engaged.

In this embodiment, the circuit board turnover station is further provided with a guide mechanism 602 for guiding the motor to translate, and the translation driving mechanism may include a driving cylinder, and the motor is pushed by a piston rod of the driving cylinder.

In this embodiment, the half clutch fixed on the output shaft of the motor selectively approaches or departs from the half clutch fixed on the pin shaft when the motor translates along the axial direction of the output shaft of the motor, so as to realize the engagement or disengagement of the jaw clutch. In this embodiment, the torque force transmitted to the clamp by the motor can overcome the acting force of the spring ejecting ball, so that the clamp rotates.

The turnover driving mechanism has reasonable design, simple structure and convenient implementation. The jaw clutch is adopted to realize engagement and disengagement, the jaw clutch is engaged when the clamp needs to be turned over so as to transmit power, and the jaw clutch is disengaged after turning over of the clamp is completed so as to avoid blocking the base and the clamp to continue to advance along the conveying direction of the conveying line.

The working process of the turnover driving mechanism is as follows:

as shown in fig. 21 and 22, the base and the clamp arrive at the circuit board flipping station with the dog clutch disengaged. As shown in fig. 23, the motor is driven by the translational driving mechanism to move close to the clamp, and the half clutch fixed on the output shaft of the motor also moves close to the half clutch fixed on the pin shaft, and finally the two half clutches are engaged. After the jaw clutch is engaged, the motor is energized to rotate the clamp, and in this embodiment, the motor is configured to rotate the clamp 180 degrees at a time. After the clamp finishes 180-degree rotation, the circuit board can be turned over, and then the motor is driven to move away from the clamp through the translation driving mechanism, so that the jaw clutch can be separated.

As shown in fig. 24 and 25, the transfer line 10 also has a plurality of board front side processing stations and a plurality of board back side processing stations;

and rotation prohibiting mechanisms for selectively prohibiting or allowing the clamp 20 to rotate are respectively arranged at part or all of the circuit board front processing stations and part or all of the circuit board back processing stations.

According to the technical scheme, the rotation forbidding mechanism is arranged, so that the phenomenon that the machining quality is influenced due to accidental rotation of the clamp in the machining process of the front surface and the back surface of the circuit board can be avoided.

The rotation prohibiting mechanism includes a cylinder 70;

the clamp 20 is provided with a jack 212, the axis of the jack 212 is parallel to the axis of the pin 201, and the axis of the jack 212 is deviated from the axis of the pin 201;

the axis of the jack 212 is overlapped with the axis of the piston rod 701 of the air cylinder when the clamp 20 reaches the station provided with the rotation prohibiting mechanism;

the piston rod 701 of the air cylinder is inserted into or pulled out of the insertion hole 212 to prohibit or allow the rotation of the jig 20.

The rotation forbidding mechanism disclosed by the technical scheme is simple in structure and convenient to implement.

The operation process of the rotation forbidding mechanism is as follows:

as shown in fig. 24, the base and the clamp reach the station where the rotation inhibiting mechanism is provided, and the piston rod of the air cylinder is pulled out of the insertion hole.

As shown in fig. 25, the cylinder actuates its piston rod to insert into the receptacle to effect locking of the clamp. After the current station machining procedure is completed, the cylinder drives the piston rod of the cylinder to be pulled out of the jack, and then the clamp can be unlocked.

As shown in fig. 26 to 34, the transfer line 10 also has a board loading station;

the circuit board loading station is provided with a control lever rotating mechanism which drives one of the front control lever 401 and the back control lever 501 to rotate from the maximum reverse rotation position to the maximum forward rotation position when the clamp 20 reaches the circuit board loading station.

This technical scheme drives the mechanism through setting up the control lever and rotates in order not to need the manual work to rotate, saves the labour.

The frame 202 has two long frame edges parallel to the conveying direction of the conveying line 10, the two pin shafts are respectively fixed on one long frame edge, and the jack is arranged on one long frame edge of the frame;

the front rotating shaft 403 fixed with the front operating lever 401 and the back rotating shaft 503 fixed with the back operating lever 501 are both positioned at the same long frame edge, and the axis of the front rotating shaft fixed with the front operating lever and the axis of the back rotating shaft fixed with the back operating lever are both vertically intersected with the axis of the pin shaft;

the length direction of the front operating lever 401 is perpendicular to the conveying direction of the conveying line 10 when the front operating lever is at the maximum reversal position;

the length direction of the back operating lever 501 is perpendicular to the conveying direction of the conveying line 10 when the back operating lever is at the maximum reverse rotation position;

the free end of the front operating lever 401 and the free end of the back operating lever 501 are both provided with a roller 80;

the lever drive mechanism includes a moving cam 90, the moving cam 90 having a cam profile for contacting the roller 80 of the free end of the upward facing one of the front lever 401 and the rear lever 501;

the cam profile comprises a reverse rotation maximum position holding section 901, an inclined transition section 902 and a forward rotation maximum position holding section 903 which are sequentially connected along the conveying direction of the conveying line;

the reverse rotation maximum position holding section 901 and the forward rotation maximum position holding section 903 are straight line sections parallel to the conveying direction of the conveyor line 10;

distances from a rotation center O of the upward one of the front joystick and the rear joystick to the reverse rotation maximum position holding section and the forward rotation maximum position holding section are L1 and L2, respectively, wherein L1> L2;

in this embodiment, the rotation center of the front joystick is located on the axis of the front rotating shaft fixed to the front joystick, and the rotation center of the back joystick is located on the axis of the back rotating shaft fixed to the back joystick;

the upward one of the front joystick 401 and the rear joystick 501 is at the reversal maximum position when the roller 80 thereof is in contact with the reversal maximum position holding section 901;

the upward one of the front joystick 401 and the rear joystick 501 is at the forward rotation maximum position when the roller 80 thereof is in contact with the forward rotation maximum position holding section 903.

The operating rod driving and rotating mechanism disclosed by the technical scheme has a simple structure, does not need to use electric or pneumatic equipment, and can reduce the production cost.

In the process that the base and the clamp move towards a circuit board loading station along the conveying direction of the conveying line, the upward roller of one of the front operating lever and the back operating lever is sequentially contacted with the reverse rotation maximum position holding section, the inclined transition section and the forward rotation maximum position holding section. And when the base and the clamp reach a circuit board loading station, the upward roller of one of the front operating lever and the back operating lever is contacted with the forward rotation maximum position holding section.

The operating process of the operating lever driving and rotating mechanism is as follows:

as shown in fig. 29, the gripper moves in the direction of the feed line, and the roller of the upward one of the front and rear levers does not contact the moving cam. As shown in fig. 30, the gripper continues to move in the direction of the feed line, with the roller first contacting the counter-rotating maximum position holding segment of the moving cam. As shown in fig. 31, the gripper continues to move along the direction of the conveyor line, the roller enters from the reversal maximum position holding section of the moving cam and contacts the inclined transition section, and the upward one of the front operating lever and the back operating lever rotates from the reversal maximum position to the forward maximum position during the rolling of the roller along the inclined transition section. As shown in fig. 32, the jig continues to move in the direction of the conveyor line, the roller enters from the inclined transition section of the moving cam and contacts the forward rotation maximum position holding section, and the upward one of the front operating lever and the back operating lever rotates to the forward rotation maximum position, at which time the jig reaches the board loading station.

After the clamp reaches a circuit board loading station, the circuit board is placed on the clamp, the front side of the circuit board faces, the clamp is driven to move along the conveying line direction of the conveying line, and when the roller wheel is separated from the forward rotation maximum position holding section, the upward front control rod and the upward back control rod are reset under the action of the front elastic reset mechanism or the back elastic reset mechanism and rotate from the forward rotation maximum position to the reverse rotation maximum position. The automatic feeding device is simple in structure, convenient and fast to achieve and capable of improving the automation degree.

In this embodiment, the moving cam is fixed relative to the guide rail.

In this embodiment, the back blocking mechanism rotates 180 degrees around the axis of the pin shaft and then coincides with the front blocking mechanism. The technical scheme can realize that the front operating lever and the back operating lever can be forced to rotate by the same moving cam when facing upwards, and the front operating lever and the back operating lever do not need to be respectively provided with a moving cam.

In this embodiment, the conveying line is further provided with a circuit board unloading station, and the circuit board unloading station is also provided with an operating lever driving mechanism which is the same as that of the circuit board loading station.

Claims

1. A pressure sensor manufacturing process comprises the following steps:

loading a circuit board to be processed on a clamp and enabling the front side of the circuit board to face upwards;

processing the front side of the circuit board;

overturning the circuit board to enable the back of the circuit board to face upwards;

processing the back of the circuit board;

the method for turning over the circuit board is to rotate the clamp;

it is characterized in that the preparation method is characterized in that,

providing a base, wherein the clamp is rotatably arranged on the base;

providing a conveying line for conveying the base;

the conveying line is provided with a circuit board overturning station, and an overturning driving mechanism for driving the clamp to rotate is arranged at the circuit board overturning station;

the clamp is provided with a pin shaft and rotates around the axis of the pin shaft;

the overturning driving mechanism comprises a motor;

a jaw clutch is arranged between an output shaft of the motor and the pin shaft, one half clutch of the jaw clutch is fixed on the output shaft of the motor, and the other half clutch is fixed on the pin shaft;

the axis of the pin shaft is superposed with the axis of the output shaft of the motor when the clamp reaches the circuit board overturning station;

the circuit board overturning station is also provided with a translation driving mechanism for driving the motor to translate along the axial direction of an output shaft of the motor so as to enable the jaw clutch to be selectively separated or jointed;

the clamp comprises a frame, wherein the frame encloses an accommodating cavity for accommodating a circuit board;

the base is provided with a spring top bead;

the frame is provided with a dimple into which a bead of the spring top bead is sunk.