Height detection device of rotary safety stop block for press machine

Abstract

The invention discloses a height detection device of a rotary safety stop block for a press machine. The height detection device comprises a rack, a sliding block and a safety stop block, a fixing shaft is arranged on the machine frame, and the safety check block is rotationally connected with the fixing shaft through a rotating frame. A laser ranging unit for detecting the height of the safety stop block is arranged on the safety stop block; buffer units are symmetrically arranged on the two sides of the rack from top to bottom, each buffer unit comprises an adsorption disc making contact with the corresponding sliding block and an adsorption cylinder, a piston is arranged in each adsorption cylinder and connected with the corresponding rotating frame through a first pull rope, and an electric control valve is arranged between each adsorption cylinder and the corresponding adsorption disc; the electric control valves are coupled with the laser ranging unit through the PLC, and the opening and closing number of the electric control valves is adjusted according to the height, fed back by the laser ranging unit, of the safety check block. The height of the safety check block is detected so that the safety check block can be in linkage with the buffering module of the sliding block, buffering contact between the sliding block and the safety check block is achieved, and the safety of the check block in the stopping process is improved.

Description

Technical Field

[0001] The invention relates to the technical field of press equipment, in particular to a height detection device for a rotary safety stopper used in a press. Background Art

[0002] As an important equipment in industrial production, the safety and ease of operation of the press are particularly important. During the daily maintenance of the press (such as equipment inspection and mold replacement), in order to ensure the safety of operators and the stability of the equipment, it is usually necessary to set a rotating safety block on one side of the press frame; when the block is screwed into the working position, it can provide reliable mechanical support for the press slide to prevent the slide from accidentally falling and causing safety accidents.

[0003] However, when using a flywheel press, there are significant technical difficulties and safety risks in the process of adjusting the position of the slider. Specifically, when the operator needs to adjust the slider downward from the top position of the equipment to get closer to the rotary safety block, the slider will show an acceleration trend during the descent process due to the inherent mechanical characteristics of the flywheel press - that is, as the descent depth increases, the slider's downward speed will continue to increase. Although the operator can try to slow down the slider's downward speed by continuously jogging the electric control device (such as the micro button), this operation method requires extremely high operator experience, reaction speed and operation accuracy. Minor operational errors or judgment delays may lead to the following technical problems: 1. High-speed impact between the slider and the block: The slider that drops too quickly will hit the block with greater kinetic energy, which will not only produce huge noise and vibration, but may also cause structural damage to the block itself; 2. After long-term use, the connection between the rotary safety block and the rotating shaft is subjected to more impacts, causing internal damage and resulting in breakage. After the breakage, the slider cannot be supported, which can easily cause safety accidents. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a height detection device for a rotary safety block for a press machine, which detects the height of the safety block and links it with a buffer module of a slider to achieve buffer contact between the slider and the safety block, thereby improving the safety of the block when blocking.

[0005] To solve the above technical problems, the present invention is solved by the following technical solutions: A height detection device for a rotary safety block for a press machine comprises a frame, a slider and a safety block rotatably arranged on one side of the frame; The frame is provided with a fixed shaft, and the safety block is rotatably connected to the fixed shaft via a rotating frame; The safety block is provided with a laser distance measuring unit for detecting the height of the safety block, and the laser distance measuring unit is connected to the PLC controller; On both sides of the frame, several buffer units matching with the sliders are symmetrically arranged from top to bottom. The buffer unit includes a suction disc in contact with the slider and a suction cylinder. A piston is arranged in the suction cylinder. The piston is connected to the rotating frame through a first pulling rope. An electric control valve is arranged between the suction cylinder and the suction disc. The electric control valve is coupled to the laser ranging unit through a PLC controller, and the opening and closing quantity of the electric control valve is adjusted according to the height of the safety stop block fed back by the laser ranging unit.

[0006] In the above solution, preferably, a negative pressure chamber is arranged on one side of the suction cylinder, and a driving chamber is arranged on the other side. A return spring is arranged between the piston and the driving chamber.

[0007] In the above solution, preferably, a first guide plate matching with the first pulling rope is arranged on the fixed shaft, and a second guide plate matching with the first pulling rope is arranged on the frame.

[0008] In the above solution, preferably, the laser ranging unit is rotatably arranged in the safety stop block, a gear is arranged on its outer edge, a lifting rod matching with the slider is slidably arranged on the top of the safety stop block, and a rack meshing with the gear is arranged on the lifting rod.

[0009] In the above solution, preferably, a sliding rod matching with the lifting rod is arranged on the safety stop block, and a lifting spring is arranged between the sliding rod and the lifting rod.

[0010] In the above solution, preferably, it includes a flywheel shaft. A brake block matching with the flywheel shaft is movably arranged on the frame. A push rod connected to the brake block is arranged on the frame. The push rod is coupled to the laser ranging unit.

[0011] In the above solution, preferably, a plurality of braking teeth are arranged on the flywheel shaft, and locking teeth which are movably engaged with the braking teeth are arranged on the brake block.

[0012] In the above solution, preferably, a lifting plate through which the first pulling rope on the piston passes is slidably arranged on the frame. The lifting plate is connected to the brake block through a second pulling rope. A third guide plate matching with the lifting plate is arranged on the frame.

[0013] In the above solution, preferably, a first hole body and a second hole body matching with the laser ranging unit are arranged in the safety stop block, and the axes of the first hole body and the second hole body are perpendicular to each other.

[0014] In the above solution, preferably, the push rod is a pneumatic push rod. After the laser ranging unit detects that the distance between it and the rotating frame changes rapidly, the pneumatic push rod is triggered.

[0015] The beneficial effects of the present invention are as follows: Through the intelligent linkage of height detection and buffer execution, the present invention completely solves the technical problem of the slider of the flywheel press hitting the safety stop during the downward acceleration.

[0016] First, based on the real-time monitoring of the stop height by the laser ranging unit and the precise control of the electro-control valve by the PLC, the dynamic hierarchical adjustment of the buffer force is realized. When the stop height decreases, the system automatically increases the number of suction cups step by step according to the preset threshold, so as to weaken the impact energy on the safety stop when the slider descends. Second, the lifting rod-rack and pinion mechanism converts the laser ranging unit into a detection unit, so that when the rotating frame breaks or bends, the flywheel braking system and the buffer unit are triggered to form a double protection. When a sudden change in height is detected, the pneumatic push rod locks the flywheel shaft with the braking teeth in milliseconds, and enhances the acting force of the buffer unit through the pull rope linkage lifting plate, forming a redundant safety guarantee. Finally, the device greatly reduces the dependence on the operator's experience. While eliminating the risk of equipment collision damage, it improves the maintenance and die-changing efficiency, and greatly enhances the safety of the press. Description of the Drawings

[0017] Figure 1 It is a front view structural schematic diagram of the present invention.

[0018] Figure 2 For the present invention Figure 1 It is a partial enlarged structural schematic diagram at A in the present invention.

[0019] Figure 3 It is a three-dimensional structural schematic diagram at the flywheel shaft of the present invention.

[0020] Figure 4 It is a three-dimensional structural schematic diagram of the laser ranging unit of the present invention. Detailed Embodiment

[0021] The following further describes the present invention in detail in conjunction with the drawings and the specific embodiments: Refer to Figures 1 - 4 .

[0022] A height detection device for a rotary safety stop of a press, including a frame 1, a slider 2 and a safety stop 3 rotatably arranged on one side of the frame 1. A flywheel shaft 4 is arranged on the frame 1. The flywheel shaft 4 is connected to a flywheel and is used to drive the slider 2 to slide up and down. And the flywheel shaft 4 and the slider 2 are connected by a linkage mechanism. This is the existing structure of a flywheel press and will not be elaborated here.

[0023] The safety stop 3 is rotatably arranged on one side of the frame 1. Through rotation, the safety stop 3 supports and disengages from the slider 2 in the longitudinal position. A fixed shaft 101 is arranged on one side of the frame 1. The safety stop 3 is rotatably connected to the fixed shaft 101 through a rotating frame 301. AsFigure 1 As shown, one end of the rotating frame 301 is provided with a safety stop block 3, and the other end is provided with a rotating sleeve that rotatably cooperates with the fixed shaft 101. The rotating sleeve can be driven by an electric push rod or a motor, so that the installation stop block 3 rotates around the fixed shaft 101 to realize the stop of the lower end surface of the slider 2.

[0024] The safety stop block 3 is cylindrical and can be longitudinally adjusted relative to the rotating frame 301. Preferably, it is adjusted by threads. A locking pin can also be provided on the rotating frame 301, and a plurality of pin holes adapted to the locking pin are provided on the safety stop block 3 to complete the up and down adjustment and locking of the safety stop block 3, which will not be elaborated here.

[0025] A laser ranging unit 302 is provided at the center of the upper end of the safety stop block 3. The laser ranging unit 302 can adopt a laser rangefinder. The safety stop block 3 is provided with a first hole body 6 in the axial direction that is adapted to the laser head of the laser ranging unit 302. The lower end of the first hole body 6 penetrates through the safety stop block 3. The laser ranging unit 302 emits a laser ray downward through the first hole body 6, so that the laser ray irradiates the mold platform of the frame 1 after passing through the first hole body 6, thereby measuring the height of the safety stop block 3 relative to the frame 1, that is, measuring the distance that the slider 2 slides from the highest point to the upper end surface of the safety stop block 3.

[0026] The laser ranging unit 302 is connected to a PLC controller and can feedback the measured distance to the PLC controller for processing. A plurality of buffer units 201 that cooperate with the side end surfaces of the slider 2 are symmetrically provided on both sides of the frame 1 from top to bottom. The buffer unit 201 includes an adsorption disc 202 that contacts the side end surface of the slider 2 and an adsorption cylinder 203 that communicates with the adsorption disc 202. An electromagnetic control valve 206 is provided between the adsorption disc 202 and the adsorption cylinder 203. The electromagnetic control valves 206 on each buffer unit 201 are coupled to the laser ranging unit 302 through the PLC controller, and the number of electromagnetic control valves 206 that are controlled to open is controlled according to the height distance of the safety stop block 3 feedback by the laser ranging unit 302; when the electromagnetic control valve 206 is controlled to open, the adsorption disc 202 and the adsorption cylinder 203 can be communicated. When there is negative pressure in the adsorption cylinder 203, the adsorption disc 202 adsorbs the side surface of the slider 2 through the negative pressure.

[0027] The side end surfaces of both sides of the slider 2 are smooth end surfaces, and because they cooperate with the slide rails, they have grease or lubricating oil, so as to improve the adsorption effect between the adsorption disc 202 and the slider 2; the adsorption cylinder 203 includes a negative pressure chamber 207 and a driving chamber 208. The negative pressure chamber 207 and the driving chamber 208 are separated by a piston 204. The negative pressure chamber 207 is connected to the adsorption disc 202 through the electromagnetic control valve 206. A return spring 209 is provided between the piston 204 and the end wall of the negative pressure chamber 207, as Figure 1 shown in the left side sectional view.

[0028] One end face of the piston 204 away from the slider 2 is connected to the rotating frame 301 through a first pulling rope 205. Specifically, a first guiding plate 102 cooperating with the first pulling rope 205 is provided on the fixed shaft 101, and a second guiding plate 103 cooperating with the first pulling rope 205 is provided on the frame 1. One end of the first pulling rope 205 is fixedly connected to the end face of the piston 204, and the other end sequentially passes through the driving cavity 208, the second guiding plate 103 and the first guiding plate 102 and then is fixedly connected to the outer edge of the frame body of the rotating frame 301. To enable the first pulling rope 205 to synchronously control each piston 204, the connection end thereof with the piston 204 can be split into multiple ropes, which are respectively fixedly connected to the end face of the piston 204, and each rope forms the first pulling rope 205 after passing through the second guiding plate 103, so as to realize the synchronous control of the buffer unit 201 by the first pulling rope 205 after driving.

[0029] In the initial state, the safety block 3 is placed outside the lower part of the slider 2. When support is needed, the rotating frame 301 drives the safety block 3 to rotate towards directly below the slider 2. At this time, the rotating frame 301 pulls the first pulling rope 205, so that the pistons 204 on each buffer unit 201 displace towards the side away from the end face of the slider 2, thereby generating a large negative pressure in the negative pressure cavity 207. At this time, each electric control valve 206 is in a closed state; when the safety block 3 rotates to directly below the slider 2, that is, as Figure 1 shown in the position, after the laser ranging unit 302 works, it measures the height of the current safety block 3, and then feeds back the height value to the PLC controller, and further enables the PLC controller to control the corresponding electric control valve 206 to open, so that the suction disc 202 of the corresponding buffer unit 201 adsorbs the slider 2, thereby slowing down the sliding speed of the slider 2; Example: As Figure 1 shown, in this embodiment, 3 groups of buffer units 201 are arranged on both sides of the frame 1 from top to bottom. When the height of the safety block 3 is at a relatively high position, that is, at this time, the distance between the slider 2 and the safety block 3 when sliding down is relatively short. Therefore, after the laser ranging unit 302 measures this distance, only the electric control valve 206 on the uppermost buffer unit 201 is opened, so that a single group of buffer units 201 adsorbs the slider 2; on the contrary, when the height of the safety block 3 is at a relatively low position, the laser ranging unit 302 can open the electric control valves 206 of all buffer units 201 after measuring this distance, so that each suction disc 202 adsorbs the slider 2, improving the buffering force of the slider 2 when sliding down.

[0030] In order to prevent the safety risk caused by the fracture of the rotating frame 301 after the slider 2 abuts against the safety stop 3, an auxiliary braking mechanism is further provided in this embodiment. Specifically, the laser ranging unit 302 is rotatably arranged in the safety stop 3, and it includes a laser head and a rotating part. A gear 303 is integrally formed on the outer edge of the rotating part. A lifting rod 304 that cooperates with the slider 2 is slidably arranged on the top of the safety stop 3. A rack 305 that meshes with the gear 303 is arranged on the end surface of the lifting rod 304 close to the gear 303, as Figure 2 shown.

[0031] A second hole body 7 that cooperates with the rotated laser head is transversely formed in the safety stop 3. The second hole body 7 is arranged on one side close to the rotating sleeve and penetrates through the wall of the safety stop 3; the axis of the second hole body 7 is perpendicular to the axis of the first hole body 6. Initially, the upper end of the lifting rod 304 is higher than the upper end surface of the safety stop 3. When the slider 2 slides down, its lower end surface contacts the upper end of the lifting rod 304 first and drives it to slide down, so that the rack 305 drives the gear 303 to rotate. Further, the laser head rotates. When the slider 2 slides down to abut against the upper end surface of the safety stop 3, the laser head of the laser ranging unit 302 rotates 90°, making it coaxial with the second hole body 7. At this time, the laser ranging unit 302 irradiates the laser onto the rotating sleeve of the rotating frame 301 and measures the distance between it and the outer wall of the rotating sleeve at this time.

[0032] A brake block 401 that cooperates with the flywheel shaft 4 is movably arranged on the frame 1. A push rod 402 connected to the brake block 401 is arranged on the frame 1. The push rod 402 can be a pneumatic push rod, and the pneumatic push rod can be a guide shaft cylinder. The pneumatic push rod is connected to the laser ranging unit 302 through a PLC controller; a plurality of brake teeth 403 are arranged on the flywheel shaft 4. Preferably, the brake teeth 403 are evenly arranged around the circumference of the flywheel shaft 4 and can be spline teeth. A locking tooth 404 that meshes with the brake teeth 403 after movement is arranged on the brake block 401. Preferably, the brake block 401 is in the shape of a semi-circular arc that fits the outer diameter of the flywheel shaft 4, and a locking tooth 404 with the same module and tooth pitch as the brake teeth 403 is arranged inside its arc. When the brake block 401 is lifted upward by the push rod 402, the brake teeth 403 are engaged with the locking teeth 404, thereby realizing the circumferential locking of the flywheel shaft 4, that is, making it non-rotatable; After the laser ranging unit 302 irradiates the laser onto the rotating sleeve of the rotating frame 301, if the rotating frame 301 is bent or broken, at this time, after the distance measured by the laser ranging unit 302 changes rapidly, the push rod 402 is triggered to lock the flywheel shaft 4 to prevent the slider 2 from sliding down; at the same time, after the laser ranging unit 302 measures that the distance changes rapidly, it synchronously triggers each electric control valve 206 to open, that is, all the electric control valves 206 are opened to increase the resistance of the slider 2 to slide down.

[0033] A lifting plate 5 through which a first pulling rope 205 on a piston 204 is threaded is slidably arranged on the frame 1. The lifting plate 5 is connected to a brake block 401 through a second pulling rope 501. A third guide plate 502 matched with the lifting plate 5 is arranged on the frame 1, that is, the lifting plate 5 is guidingly and slidably arranged on the third guide plate 502. The lifting plate 5 is placed between a second guide plate 103 and the side wall of the frame 1. The first pulling ropes 205 on the pistons 204 of the respective buffer units 201 are all arranged through the lifting plate 5. When the brake block 401 slides upward to cooperate with and lock the flywheel shaft 4, it is synchronously lifted upward through the lifting plate 5. The lifting plate 5 then pulls the first pulling rope 205 to further slide the piston 204 away from the slider 2, increasing the negative pressure in the negative pressure chamber 207, thereby increasing the adsorption force of the suction cup 202 on the side wall of the slider 2, so as to buffer the contact force between the brake block 401 and the flywheel shaft 4 to a certain extent.

[0034] To realize the reset of the laser ranging unit 302, a slide bar 306 matched with a lifting rod 304 is arranged in the safety stop block 3. The slide bar 306 can be a hexagonal bar. A hexagonal hole slidably matched with the slide bar 306 is arranged in the lifting rod 304. A lifting spring 307 is arranged between the upper end of the slide bar 306 and the bottom of the hexagonal hole of the lifting rod 304, so as to realize the downward sliding and reset of the lifting rod 304.

[0035] Method for using a height detection device of a rotary safety stop block for a press as described above: S1: Adjust the safety stop block 3 relative to the rotating frame 301 to a certain height, drive the rotating frame 301 to rotate the rotating frame 301 around the fixed shaft 101, and rotate the safety stop block 3 below the slider 2; S2: While the rotating frame 301 rotates, pull the first pulling rope 205 to slide the piston 204 away from the slider 2, so as to generate a large negative pressure in the negative pressure chamber 207; S3: The laser ranging unit 302 measures downward the height of the safety stop block 3 relative to the end face of the mold table of the frame 1. The PLC controller opens the electric control valve 206 of the corresponding buffer unit 201 according to the measured height, so that the corresponding suction cup 202 communicates with the corresponding negative pressure chamber 207, and the suction cup 202 generates an adsorption force to adsorb the side wall of the slider 2; S4: The slider 2 slides downward. At the same time, the sliding speed is reduced through the adsorption forces of different numbers of suction cups 202 until the lower end of the slider 2 abuts against the upper end of the safety stop block 3; S5: When the slider 2 slides down to abut against the upper end face of the safety stop block 3, the laser head of the laser ranging unit 302 rotates 90° through the cooperation of the rack 305 and the gear 303 to make it coaxial with the second hole body 7. At this time, the laser ranging unit 302 irradiates the laser on the rotating sleeve of the rotating frame 301 and measures the distance between it and the outer wall of the rotating sleeve. S6: In step S5, if the rotating frame 301 bends or breaks after the slider 2 abuts against the safety stop block 3, at this time, the distance measured by the laser ranging unit 302 changes rapidly and then triggers the push rod 402, so that the brake block 401 locks the flywheel shaft 4 to prevent the slider 2 from sliding down; at the same time, after the laser ranging unit 302 measures that the distance changes rapidly, it synchronously triggers each electromagnetic control valve 206 to open, that is, all the electromagnetic control valves 206 are opened to increase the resistance of the slider 2 to slide down. S7: In step S6, when the brake block 401 slides upward to cooperate with and lock the flywheel shaft 4, it is synchronously lifted upward by the lifting plate 5. The lifting plate 5 then pulls the first pull rope 205 to make the piston 204 slide further away from the slider 2, increasing the negative pressure in the negative pressure chamber 207, thereby increasing the adsorption force of the adsorption disc 202 on the side wall of the slider 2, and buffering the contact force between the brake block 401 and the flywheel shaft 4 to a certain extent.

[0036] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A height detection device for a rotary safety stop of a press, characterized in that: It includes a frame (1), a slider (2), and a safety stop (3) rotatably arranged on one side of the frame (1); A fixed shaft (101) is arranged on the frame (1), and the safety stop (3) is rotatably connected to the fixed shaft (101) through a rotating frame (301); A laser ranging unit (302) for detecting the height of the safety stop (3) is arranged on the safety stop (3), and the laser ranging unit (302) is connected to a PLC controller; A plurality of buffer units (201) matching the slider (2) are symmetrically arranged on both sides of the frame (1) from top to bottom. The buffer unit (201) includes a suction disc (202) in contact with the slider (2) and a suction cylinder (203). A piston (204) is arranged in the suction cylinder (203), and the piston (204) is connected to the rotating frame (301) through a first pull rope (205). An electromagnetic control valve (206) is arranged between the suction cylinder (203) and the suction disc (202); The electromagnetic control valve (206) is coupled to the laser ranging unit (302) through the PLC controller, and the opening and closing quantity of the electromagnetic control valve (206) is adjusted according to the height of the safety stop (3) fed back by the laser ranging unit (302).

2. The height detection device for the rotary safety stop of a press according to claim 1, wherein: A negative pressure chamber (207) is arranged on one side of the suction cylinder (203), and a driving chamber (208) is arranged on the other side. A return spring (209) is arranged between the piston (204) and the driving chamber (208).

3. The height detection device for the rotary safety stop of a press according to claim 1, characterized in that: A first guide plate (102) matching the first pull rope (205) is arranged on the fixed shaft (101), and a second guide plate (103) matching the first pull rope (205) is arranged on the frame (1).

4. The height detection device of a rotary safety stop for a press according to claim 1, characterized in that: The laser ranging unit (302) is rotatably arranged in the safety stop (3), a gear (303) is arranged on its outer edge, a lifting rod (304) matching the slider (2) is slidably arranged on the top of the safety stop (3), and a rack (305) meshing with the gear (303) is arranged on the lifting rod (304).

5. The height detection device of a rotary safety stop for a press according to claim 4, characterized in that: A slide rod (306) matching the lifting rod (304) is arranged on the safety stop (3), and a lifting spring (307) is arranged between the slide rod (306) and the lifting rod (304).

6. The height detection device for the rotary safety stop of a press according to claim 5, characterized in that: It includes a flywheel shaft (4). A brake block (401) matching the flywheel shaft (4) is movably arranged on the frame (1). A push rod (402) connected to the brake block (401) is arranged on the frame (1), and the push rod (402) is coupled to the laser ranging unit (302).

7. The height detection device for the rotary safety stop of a press according to claim 6, characterized in that: A plurality of brake teeth (403) are arranged on the flywheel shaft (4), and locking teeth (404) which are movably engaged with the brake teeth (403) are arranged on the brake block (401).

8. The height detection device for the rotary safety stop of a press according to claim 7, characterized in that: A lifting plate (5) through which the first pull rope (205) on the piston (204) passes is slidably arranged on the frame (1). The lifting plate (5) is connected to the brake block (401) through a second pull rope (501), and a third guide plate (502) matching the lifting plate (5) is arranged on the frame (1).

9. The height detection device for the rotary safety stop of a press according to claim 1, characterized in that: The safety stopper (3) is provided with a first hole body (6) and a second hole body (7) which are matched with the laser ranging unit (302), and the axes of the first hole body (6) and the second hole body (7) are perpendicular to each other.

10. The height detection device for the rotary safety stopper of a press according to claim 6, characterized in that: The push rod (402) is a pneumatic push rod, and the laser ranging unit (302) triggers the pneumatic push rod after detecting a rapid change in the distance between it and the rotating frame (301).

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