Automatic screening device for precise fasteners

Abstract

The utility model discloses an automatic screening device for precision fasteners, which relates to the technical field of screening devices and comprises a frame, a screen connected in the frame in a sliding manner and a shaking component abutted against the screen, and the shaking component comprises a shaking part driven by a power source and in rotary fit with the frame. The vibrating screen is characterized in that an adjusting cavity is formed in the vibrating part, a pushing block is slidably connected into the adjusting cavity, a limiting groove is formed in the top face of the pushing block, one end of an abutting rod is slidably connected into the limiting groove, and the other end of the abutting rod penetrates out of the top face of the vibrating part, extends upwards and finally abuts against the screen. The vibration amplitude adjusting device has the advantages of being compact in structure and flexible and convenient to adjust, and the function of adjusting the vibration amplitude on line can be achieved by changing the length of the long shaft of the vibration cam on line.

Description

Technical Field

[0001] The utility model relates to the technical field of screening devices, in particular to an automatic screening device for precision fasteners. Background Art

[0002] With the continuous advancement of industrial manufacturing technology, precision fasteners, as indispensable key components in mechanical equipment and engineering structures, their performance and quality are crucial to the stability and safety of the entire system. However, due to the wide variety and specifications of fasteners, traditional manual screening methods have problems such as low efficiency and high error rate, which are difficult to meet the needs of modern large-scale production. Therefore, it is particularly important to develop an efficient and accurate precision fastener screening device.

[0003] The existing Chinese patent (application number: CN202020553085.7) discloses an automatic screening device for precision fasteners. Through the cooperation between the coarse-hole mesh plate and the fine-hole mesh plate, three fasteners of different specifications can be screened at the same time. Through the mutual cooperation between the motor, the elliptical plate and the spring, the coarse-hole mesh plate and the fine-hole mesh plate can be vibrated up and down, thereby speeding up the screening work speed, combining the simultaneous screening of three specifications to maximize the screening efficiency.

[0004] However, when the above automatic screening device is in use, although the larger bolts or nuts will not slip off the screen, they may be partially stuck in the screen holes; at the same time, when the above device is used for screening, the size of its vibration cam is fixed, and it is difficult to adjust according to the size of the fastener, and obviously, the optimal range of vibration amplitude of fasteners of different sizes is often different. If the shaking amplitude is too large, it may cause a large loss of the connecting parts of the screen, and if the shaking amplitude is too small, the fasteners may not be shaken out of the screen, which will cause some mesh holes of the screen to be blocked and the screening efficiency to decrease.

[0005] In view of this, this application is hereby filed. Utility Model Content

[0006] The utility model aims to provide an automatic screening device for precision fasteners, which has the advantages of compact structure and flexible and convenient adjustment, and can realize the online adjustment function of the vibration amplitude by online changing the major axis length of the vibration cam.

[0007] In order to solve the above technical problems, the utility model provides an automatic screening device for precision fasteners, including a frame, a screen slidably connected to the frame, and a shaking assembly that interferes with the screen, the shaking assembly including a shaking member driven by a power source and rotating with the frame, characterized in that: an adjustment cavity is provided in the shaking member, a push block is slidably connected to the adjustment cavity, a limiting groove is provided on the top surface of the push block, one end of a resistance rod is slidably connected to the limiting groove, and the other end of the resistance rod passes through the top surface of the shaking member and extends upward, finally interfering with the screen.

[0008] Preferably, the top surface of the pushing block is inclined, the limiting groove is parallel to the top surface of the pushing block, the limiting groove is a dovetail groove, and the bottom surface of the abutment rod is a dovetail shape adapted thereto.

[0009] Preferably, the shaking assembly also includes a slider, a telescopic slot is opened at the lower end of the limit slot, the slider is slidably connected in the telescopic slot, the front side of the slider is rotatably connected with a threaded rod, the threaded rod is threadedly connected to the shaking part, and the other end of the threaded rod passes through the front side of the shaking part to form an idle fit with the frame.

[0010] Preferably, a fixing component is provided on the front side of the shaking part, and the fixing component includes a positioning frame and a positioning ring. The positioning ring is fixedly connected to the side wall behind the other end of the threaded rod, and the positioning ring is located in the positioning frame. A positioning block is slidably connected to the positioning frame, and a connecting groove is provided in the positioning frame. One side of the positioning block passes through the connecting groove and is provided on the outside of the positioning frame, and the positioning block is provided with a groove that engages with the positioning ring.

[0011] Preferably, one end of the spring is fixedly connected to the front of the shaking part, and the other end of the spring is fixedly connected to the back of the positioning block. The spring is sleeved around the outer wall of the threaded rod. The spring is located in the positioning frame, and a chamfer is provided on the groove where the positioning block and the positioning ring engage.

[0012] Preferably, there are two shaking parts, and a driving assembly is provided on one side of the shaking part located at the bottom, and the driving group includes a transmission belt and a motor. The output shaft of the motor is fixedly connected with a worm, and a worm wheel meshing with the worm is provided on the outer wall of the shaking part located at the bottom; belt grooves are provided on the outer walls of the two shaking parts, and the transmission belt and the belt grooves provided on the two shaking parts are combined to form a synchronous belt transmission.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] By setting a shaking assembly, when the mesh of the screen is blocked, the length of the interference rod extending from the shaking member becomes longer by rotating the threaded rod on the front of the shaking member, which can be regarded as the side length of the long axis of the vibration cam. At this time, the vibration amplitude of the screen that directly conflicts with the vibration cam will also increase accordingly. By increasing the shaking amplitude of the screen, the fasteners that are blocked in the mesh of the screen are thrown out, thereby achieving the purpose of cleaning the blocked mesh of the screen. After the cleaning is completed, the threaded rod can be rotated in the opposite direction so that the interference rod is reset to the original length. At this time, it can be regarded as the long axis size of the vibration cam is shortened to the original design size. Then the screen can continue to work at a predetermined vibration amplitude to prevent the situation where long-term large-scale shaking reduces the service life of the interference rod and the connecting piece. Similarly, when the specifications and dimensions of the fasteners change and the vibration amplitude of the screen needs to be adjusted online, the telescopic changes of the above-mentioned interference rod can also be used to achieve the online adjustment effect, so that while ensuring the online adjustment capability, the flexibility of use can also be effectively guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A top view of an automatic screening device for precision fasteners;

[0016] Figure 2 It is a schematic diagram of the cross-sectional structure of an automatic screening device for precision fasteners;

[0017] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0018] Figure 4 for Figure 2 The enlarged view of point B in the middle;

[0019] Figure 5 The figure is a rear cross-sectional view of an automatic screening device for precision fasteners.

[0020] In the figure:

[0021] 1. Frame; 101. Mounting plate; 102. Connector; 2. Screen; 3. Shaking member; 301. Adjusting chamber; 302. Pushing block; 303. Limiting groove; 304. Resistance rod; 305. Sliding block; 306. Threaded rod; 307. Positioning ring; 4. Positioning frame; 401. Positioning block; 402. Spring; 5. Transmission belt; 501. Belt groove; 6. Motor; 601. Worm; 602. Worm wheel. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-5 The utility model provides a technical solution: it includes a frame 1, a screen 2 slidably connected in the frame 1, and a shaking component that conflicts with the screen 2, the shaking component includes a shaking piece 3 rotatably connected to the front side of the frame 1, an adjusting chamber 301 is opened in the shaking piece 3, a pushing block 302 is slidably connected in the adjusting chamber 301, a sliding block 305 that can only slide along the opening direction of the adjusting chamber 301 is arranged on the front side of the pushing block 302, a limiting groove 303 is opened on the top surface of the pushing block 302, one end of a resisting rod 304 is slidably connected in the limiting groove 303, and the other end of the resisting rod 304 passes through the square hole opened on the top surface of the shaking piece 3 and conflicts with the screen 2, the top surface of the pushing block 302 is inclined, the limiting groove 303 is arranged parallel to the top surface of the pushing block 302, the limiting groove 303 is a dovetail groove, and the bottom surface of the resisting rod 304 is a dovetail shape adapted thereto.

[0024] By adopting the above design, the lateral position of the interference rod 304 is limited by the square hole on the top surface of the shaking member 3, and it cannot move horizontally. Then the protrusion at the bottom is engaged by the limiting groove 303, so that the vertical position of the interference rod 304 is limited and it cannot slide up and down. The interference rod 304 can only exist at the overlap of the limiting groove 303 and the square hole. Therefore, when the pushing block 302 moves, the square hole does not move, and the overlapping position of the limiting groove 303 and the square hole changes. When the limiting groove 303 moves toward the rear of the shaking member 3, the limiting groove 303 03 coincides with the square hole and moves toward the upper part of the limit slot 303, the protrusion on one end of the abutment rod 304 is raised, thereby making the portion of the abutment rod 304 extending from the shaking member 3 longer, and vice versa, the extended length is shorter, thereby adjusting the length of the abutment rod 304 extending from the shaking member 3, and then controlling the shaking amplitude of the screen 2, so that normal amplitude shaking screening is performed under normal conditions, and when the mesh is blocked, a large amplitude shaking can be performed to throw out the fasteners stuck in the mesh.

[0025] Further, refer to Figure 2 and Figure 3 The shaking component also includes a slider 305, a telescopic slot is opened at the lower end of the limit slot 303, the slider 305 is slidably connected in the telescopic slot, the front of the slider 305 is rotatably connected with a threaded rod 306, the threaded rod 306 is threadedly connected to the shaking member 3, and the other end of the threaded rod 306 passes through the front of the shaking member 3.

[0026] By adopting the above design, the staff can rotate the threaded rod 306 on the front side of the shaking member 3, thereby driving the pushing block 302 threadedly connected to the threaded rod 306 to slide back and forth along the adjustment cavity 301, so as to simply and quickly adjust the length of the resistance rod 304 extending from the shaking member 3, and then adjust the shaking amplitude of the screen 2.

[0027] refer to Figure 1 , Figure 2 and Figure 4 Furthermore, a fixing component is provided on the front of the shaking member 3, and the fixing component includes a positioning frame 4 and a positioning ring 307. The positioning ring 307 is fixedly connected to the side wall behind the other end of the threaded rod 306, and the positioning ring 307 is located in the positioning frame 4. A positioning block 401 is slidably connected to the positioning frame 4, and a connecting groove is provided in the positioning frame 4. One side of the positioning block 401 passes through the connecting groove and is provided on the outside of the positioning frame 4. A groove engaged with the positioning ring 307 is provided on the positioning block 401. One end of a spring 402 is fixedly connected to the front of the shaking member 3, and the other end of the spring 402 is fixedly connected to the back of the positioning block 401. The spring 402 is sleeved around the outer wall of the threaded rod 306, and the spring 402 is located in the positioning frame 4. A chamfer is provided on the groove engaged with the positioning block 401 and the positioning ring 307, and the chamfer is provided in the clockwise direction when the threaded rod 306 rotates.

[0028] By adopting the above design, the threaded rod 306 will be limited by the positioning block 401 on the outer wall under normal conditions, and because a chamfer is provided in the groove of the positioning block 401, when the threaded rod 306 rotates in the direction of the chamfer, the positioning block 401 can be pushed along the chamfer to separate from it, and then the positioning block 401 will contact the positioning ring 307 again under the drive of the spring 402, so that the threaded rod 306 can rotate in one direction. When reversing, it will be stuck in the groove and cannot rotate, so that after the length of the interference rod 304 extending from the shaking member 3 becomes longer, the threaded rod 306 will not rotate due to the shaking generated when contacting the screen 2, so that the external position of the shaking member 3 is changed, and the interference rod 304 shrinks. When the threaded rod 306 needs to be reversed, one side of the positioning block 401 can be moved away from the positioning ring 307, and then the threaded rod 306 can be rotated in the opposite direction to drive the interference rod 304 to retract.

[0029] In addition, reference Figure 1 , Figure 2 and Figure 5A mounting plate 101 is provided in the frame 1. There are two groups of mounting plates 101, two in each group. There is a height difference between the mounting plates 101 in each group, and a connecting member 102 is provided on the mounting plate 101. The connecting member 102 includes a spring 402 and a telescopic sleeve. The other end of the connecting member 102 is fixedly connected to the bottom surface of the screen 2. A discharge port is provided near the mounting plate 101 located at a lower position. There are two shaking members 3. A driving assembly is provided on one side of the shaking member 3 located at the bottom. The driving group includes a transmission belt 5 and a motor 6. The output shaft of the motor 6 is fixedly connected to a worm 601. A worm wheel 602 meshing with the worm 601 is provided on the side wall of the shaking member 3 located at the bottom. A belt groove 501 is provided on the shaking member 3, and the two ends of the transmission belt 5 are respectively matched in the belt grooves 501 provided on the two shaking members 3.

[0030] By adopting the above design, when screening is needed, the worm 601 can be driven to rotate by starting the motor 6, thereby driving the shaking member 3 provided with the worm wheel 602 to rotate, and the transmission belt 5 provided on the shaking member 3 will transmit the power to the other shaking member 3. When the shaking member 3 rotates, the other end of the interference rod 304 will also rotate. When the other end of the interference rod 304 turns down, it no longer interferes with the bottom surface of the screen 2, and the screen 2 loses the support of the interference rod 304. Then the screen 2 falls under the joint action of the connecting member 102 and gravity, and then when the interference rod 304 turns up, it interferes with the bottom surface of the screen 2 again, providing support for the bottom surface of the screen 2 to make the screen 2 rise, so that the screen 2 shakes up and down to screen the fasteners on the top surface of the screen 2.

[0031] And because the discharge port is located at the lower mounting plate 101, under the guidance of gravity, the fasteners after the powder screening is completed will automatically roll down from the top of the screen 2 and slide out of the discharge port.

[0032] Working principle:

[0033] When in use, the worm 601 can be driven to rotate by starting the motor 6, thereby driving the shaking member 3 provided with a worm gear 602 to rotate. The transmission belt 5 provided on the shaking member 3 will transmit the power to the other shaking member 3. When the shaking member 3 rotates, the other end of the resistance rod 304 will also rotate. When the other end of the resistance rod 304 turns down, it no longer conflicts with the bottom surface of the screen 2, and then the screen 2 drops. Then, when it turns up, it conflicts with the bottom surface of the screen 2 again, causing the screen 2 to rise, so that the screen 2 shakes up and down to screen the fasteners on the top surface of the screen 2. It can be seen that the length of the resistance rod 304 is the length of the major axis of the vibration cam, and the resistance rod 304 cooperates with the rotation of the shaking member 3 to continuously push the screen 2 upward, thereby realizing the rotation of the vibration cam and the continuous vibration effect of the screen 2.

[0034] When it is found that some fasteners are stuck in the mesh of the screen 2, resulting in a decrease in the screening efficiency of the screen 2, the threaded rod 306 can be rotated clockwise to drive the shaking member 3 threadedly connected to the threaded rod 306 to move along the thread of the threaded rod 306 toward the rear of the shaking member 3, so that one end of the resistance rod 304 slides toward the upper half of the limit groove 303, so that the portion of the resistance rod 304 extending from the shaking member 3 is longer, so that the screen 2 rises and slides each time, and the effect of increasing the shaking amplitude of the screen 2 is achieved. At this time, the fasteners stuck in the mesh will be thrown out, and the shaking amplitude of the screen 2 can be adjusted by adjusting the length of the resistance rod 304 extending from the shaking member 3, so as to achieve the purpose of anti-blocking. Similarly, when the specifications and dimensions of the fasteners change and the vibration amplitude of the screen 2 needs to be adjusted online, the telescopic change of the above-mentioned resistance rod 304 can also be used to achieve the online adjustment effect, so that while ensuring the online adjustment capability, the flexibility of use can also be effectively guaranteed.

[0035] After the screening is completed, the discharge port can be opened. Since the discharge port is located at the lower mounting plate 101, under the guidance of gravity, the fasteners after the powder screening will automatically roll down from the top of the screen 2 and slide out of the discharge port.

Claims

1. An automatic screening device for precision fasteners, comprising a frame (1), a screen (2) slidably connected to the frame (1), and a shaking assembly that contacts the screen (2), wherein the shaking assembly comprises a shaking member (3) driven by a power source and rotatably matched with the frame (1), characterized in that: The shaking member (3) is provided with an adjustment cavity (301), a pushing block (302) is slidably connected in the adjustment cavity (301), a limiting groove (303) is provided on the top surface of the pushing block (302), one end of a resistance rod (304) is slidably connected in the limiting groove (303), and the other end of the resistance rod (304) passes through the top surface of the shaking member (3) and extends upward, finally resisting against the screen (2).

2. The automatic screening device for precision fasteners according to claim 1, characterized in that: The top surface of the pushing block (302) is arranged tilted, the limiting groove (303) is arranged parallel to the top surface of the pushing block (302), the limiting groove (303) is a dovetail groove, and the bottom surface of the abutting rod (304) is a dovetail shape adapted thereto.

3. The automatic screening device for precision fasteners according to claim 2, characterized in that: The shaking component also includes a slider (305), a telescopic slot is provided at the lower end of the limit slot (303), the slider (305) is slidably connected in the telescopic slot, the front side of the slider (305) is rotatably connected with a threaded rod (306), the threaded rod (306) is threadedly connected to the shaking member (3), and the other end of the threaded rod (306) passes through the front side of the shaking member (3) to form an idle fit with the frame (1).

4. The automatic screening device for precision fasteners according to claim 3, characterized in that: A fixing component is arranged on the front side of the shaking member (3), and the fixing component comprises a positioning frame (4) and a positioning ring (307). The positioning ring (307) is fixedly connected to the side wall behind the other end of the threaded rod (306). The positioning ring (307) is located in the positioning frame (4). A positioning block (401) is slidably connected to the positioning frame (4). A connecting groove is provided in the positioning frame (4). One side of the positioning block (401) passes through the connecting groove and is arranged on the outside of the positioning frame (4). The positioning block (401) is provided with a groove that engages with the positioning ring (307).

5. The automatic screening device for precision fasteners according to claim 4, characterized in that: One end of a spring (402) is fixedly connected to the front of the shaking member (3), and the other end of the spring (402) is fixedly connected to the back of the positioning block (401). The spring (402) is sleeved around the outer wall of the threaded rod (306). The spring (402) is located in the positioning frame (4), and a chamfer is provided on the groove where the positioning block (401) and the positioning ring (307) are engaged.

6. The automatic screening device for precision fasteners according to claim 5, characterized in that: There are two shaking parts (3), and a driving assembly is arranged on one side of the shaking part (3) located at the bottom, and the driving assembly includes a transmission belt (5) and a motor (6), and the output shaft of the motor (6) is fixedly connected with a worm (601), and a worm wheel (602) meshing with the worm (601) is arranged on the outer wall of the shaking part (3) located at the bottom; belt grooves (501) are provided on the outer walls of the two shaking parts (3), and the transmission belt (5) and the belt grooves (501) provided on the two shaking parts (3) are combined to form a synchronous belt transmission.

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