An online screw size detection system

Abstract

The invention discloses an online screw size detection system, which relates to the technical field of screw quality inspection. The invention can automatically detect the length, thread condition, nut thickness and stud diameter of the screw, avoids the tedious process of manual detection, greatly improves the detection efficiency and accuracy, and is suitable for rapid quality control on large-scale production lines; by setting multiple detection sheets and grating reading heads, it is possible to comprehensively detect multiple parameters of the screw, including length, thread condition, nut thickness and stud diameter, to ensure that each batch of screws meets the standards and improve product quality; after the screw detection is completed, by designing a reasonable separation and discharge mechanism, the screw can quickly separate from the conveyor belt after detection and fall into a designated position, ensuring the continuity and efficiency of the production process.

Description

Technical Field

[0001] The invention relates to the technical field of screw quality inspection, and in particular to an online screw size detection system. Background Art

[0002] At present, the traditional screw detection method usually relies on manual detection using measuring tools, so there is no way to batch detect a large number of screws, and it is also easy to have misjudgment problems. In addition, due to the different habits of each inspector, the value of the same screw will also have a slight deviation. At the same time, the current manual detection method only detects a certain parameter of the screw, and cannot detect multiple parameters of the screw. If multiple parameters of the screw are manually detected, it will take a lot of time, and it is impossible to batch size screen a large number of screws. Summary of the invention

[0003] In order to overcome the defects of the above-mentioned prior art, the present invention provides the following technical solutions: an online screw size detection system, comprising two parallel supporting side plates, wherein an air nozzle is fixedly installed on the top of one of the supporting side plates, and a third detection piece support frame is also fixedly installed between the two supporting side plates, and a third detection piece is slidably installed on the third detection piece support frame through two parallel third detection piece support rods for detecting the length of the screw; a frame, a permanent magnet frame and a support block are also fixedly installed between the two supporting side plates, wherein the permanent magnet frame and the support block are fixedly matched, and a conveyor belt is provided on the outer rotating sleeves of the permanent magnet frame and the support block, and a plurality of baffles are equidistantly arranged on the surface of the conveyor belt for moving the screw; two symmetrically arranged first detection piece support plates are fixedly installed on the frame, and a first detection piece is slidably installed on the first detection piece support plate through two parallel first detection piece support rods for detecting the diameter of the screw; a second detection piece support frame is fixedly installed on the frame, and the second detection piece support frame is equipped with a second detection piece for detecting the thickness of the screw nut.

[0004] Preferably, the air nozzle is supplied with gas by an air pump, a supporting side plate without a fixed air nozzle is provided with a slot, and a wind shield is fixedly mounted on the slot to shield the airflow ejected from the air nozzle and prevent the airflow from blowing onto the pressure plate.

[0005] Preferably, a third return spring is arranged around each third detection piece support rod, and both ends of the third return spring are fixed to the third detection piece support frame and the third detection piece; a first return spring is arranged around each first detection piece support rod, and both ends of the first return spring are fixed to the first detection piece and the first detection piece support plate.

[0006] Preferably, a second detection piece adjustment bracket is slidably installed on the second detection piece support frame through two parallel second detection piece support rods, and a second detection piece is slidably installed on the second detection piece adjustment bracket through a second detection piece adjustment sliding rod and a second detection piece adjustment screw rod, wherein a second detection piece adjustment wheel is threadedly sleeved on the second detection piece adjustment screw rod, and the second detection piece adjustment wheel rotates in cooperation with the second detection piece adjustment bracket.

[0007] Preferably, each second detection piece support rod is surrounded by a second reset spring, and both ends of the second reset spring are fixed to the second detection piece adjustment bracket and the second detection piece support bracket; the second detection piece adjustment bracket is slidably mounted with a second grating reading head bracket through a slide track, the second grating reading head is fixedly mounted on the second grating reading head bracket, and a second scale grating matched with the second grating reading head is fixedly mounted on the second detection piece, and the second grating reading head bracket is slidably matched with the second detection piece support bracket.

[0008] Preferably, a first scale grating is fixedly mounted on the first detection piece, and a first grating reading head matching the first scale grating is fixedly mounted on the support plate of the first detection piece; a third grating reading head is fixedly mounted on the third detection piece, and a third scale grating matching the third grating reading head is fixedly mounted on the support side plate of the fixed air nozzle.

[0009] Preferably, a sunken groove is provided on the permanent magnet frame at the position of the air nozzle, one end of the inner wall of the sunken groove is movably connected to a pressure plate, a force-sensitive resistor bracket is fixedly installed on the side of the permanent magnet frame, the force-sensitive resistor bracket is in contact with the pressure plate, and a force-sensitive resistor is overlapped on the contact surface.

[0010] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can automatically detect the length, thread condition, nut thickness and stud diameter of the screw, avoiding the tedious process of manual detection, greatly improving the detection efficiency and accuracy, and being suitable for rapid quality control on large-scale production lines; (2) The present invention can comprehensively detect multiple parameters of the screw, including length, thread condition, nut thickness and stud diameter, by setting a plurality of detection sheets and grating reading heads, to ensure that each batch of screws meets the standards and improve product quality; (3) After the screw detection is completed, the present invention can quickly separate the conveyor belt after detection and fall into the designated position by designing a reasonable separation and discharge mechanism, thereby ensuring the continuity and efficiency of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0012] Figure 2 It is a structural schematic diagram of the first detection sheet support plate of the present invention.

[0013] Figure 3 It is a schematic diagram of the framework structure of the present invention.

[0014] Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A in the middle.

[0015] Figure 5 For the present invention Figure 3 Schematic diagram of the structure at point B in the middle.

[0016] Figure 6 It is a schematic diagram of the structure of the permanent magnet frame of the present invention.

[0017] Figure 7 It is a schematic diagram of the sunken groove structure of the present invention.

[0018] In the figure: 101-frame; 102-first detection sheet support plate; 103-first detection sheet support rod; 104-first return spring; 105-first detection sheet; 106-first scale grating; 107-first grating reading head; 108-second detection sheet support frame; 109-second detection sheet support rod; 110-second return spring; 111-second detection sheet adjustment slide rod; 112-second detection sheet adjustment bracket; 113-slide rail; 114-second detection sheet adjustment screw rod; 115-second detection sheet adjustment wheel; 116-second grating reading head bracket; 11 7-second detection sheet; 118-second grating reading head; 119-second scale grating; 120-support side plate; 121-wind shield; 122-sunken groove; 123-third detection sheet support frame; 124-third detection sheet support rod; 125-third return spring; 126-third detection sheet; 127-third grating reading head; 128-third scale grating; 129-jet nozzle; 130-air pump; 131-pressure plate; 132-permanent magnet frame; 133-support block; 134-conveyor belt; 135-force sensitive resistor; 136-force sensitive resistor bracket. DETAILED DESCRIPTION

[0019] The following is combined with Figure 1-7 , and further illustrate the technical solution of the present invention through specific implementation methods.

[0020] The present invention provides an online screw size detection system, comprising two parallel supporting side plates 120, wherein an air nozzle 129 is fixedly installed on the top of one of the supporting side plates 120, and a third detection piece support frame 123 is also fixedly installed between the two supporting side plates 120, and a third detection piece 126 is slidably installed on the third detection piece support frame 123 through two parallel third detection piece support rods 124, which is used to detect the length of the screw; a frame 101, a permanent magnet frame 132 and a support block 133 are also fixedly installed between the two supporting side plates 120, wherein the permanent magnet frame 132 and the support block 133 are fixedly installed between them. The outer rotating sleeve of the permanent magnet frame 132 and the support block 133 is provided with a conveyor belt 134, and a plurality of baffles are equidistantly arranged on the surface of the conveyor belt 134 for moving the screw; two symmetrically arranged first detection sheet support plates 102 are fixedly installed on the frame 101, and a first detection sheet 105 is slidably installed on the first detection sheet support plate 102 through two parallel first detection sheet support rods 103 for detecting the diameter of the screw; a second detection sheet support frame 108 is fixedly installed on the frame 101, and a second detection sheet 117 for detecting the thickness of the screw nut is arranged on the second detection sheet support frame 108. The air nozzle 129 is supplied with gas by the air pump 130, and a slot is provided on a supporting side plate 120 without the air nozzle 129, and a windshield plate 121 is fixedly installed on the slot to block the airflow ejected by the air nozzle 129 and prevent the airflow from blowing onto the pressure plate 131. A third return spring 125 is disposed around each third detection piece support rod 124, and the two ends of the third return spring 125 are fixed to the third detection piece support frame 123 and the third detection piece 126; a first return spring 104 is disposed around each first detection piece support rod 103, and the two ends of the first return spring 104 are fixed to the first detection piece 105 and the first detection piece support plate 102. A second detection piece adjustment bracket 112 is slidably mounted on the second detection piece support frame 108 through two parallel second detection piece support rods 109, and a second detection piece 117 is slidably mounted on the second detection piece adjustment bracket 112 through a second detection piece adjustment slide bar 111 and a second detection piece adjustment screw rod 114, wherein a second detection piece adjustment wheel 115 is threadedly sleeved on the second detection piece adjustment screw rod 114, and the second detection piece adjustment wheel 115 is rotationally matched with the second detection piece adjustment bracket 112. A second reset spring 110 is arranged around each second detection piece support rod 109, and both ends of the second reset spring 110 are fixed to the second detection piece adjustment bracket 112 and the second detection piece support bracket 108; a second grating reading head bracket 116 is slidably installed on the second detection piece adjustment bracket 112 through a slide rail 113, a second grating reading head 118 is fixedly installed on the second grating reading head bracket 116, a second scale grating 119 matched with the second grating reading head 118 is fixedly installed on the second detection piece 117, and the second grating reading head bracket 116 is slidably matched with the second detection piece support bracket 108.The first detection sheet 105 is fixedly mounted with a first scale grating 106, and the first detection sheet support plate 102 is fixedly mounted with a first grating reading head 107 matched with the first scale grating 106; the third detection sheet 126 is fixedly mounted with a third grating reading head 127, and the supporting side plate 120 of the fixed air nozzle 129 is fixedly mounted with a third scale grating 128 matched with the third grating reading head 127. A sunken groove 122 is provided on the permanent magnet frame 132 at the position of the air nozzle 129, and a pressure plate 131 is movably connected to one end of the inner wall of the sunken groove 122, and a force-sensitive resistor bracket 136 is fixedly mounted on the side of the permanent magnet frame 132, and the force-sensitive resistor bracket 136 is in contact with the pressure plate 131, and a force-sensitive resistor 135 is overlapped on the contact surface.

[0021] The working principle of an online screw size detection system disclosed in the present invention is as follows: the screws are placed on a conveyor belt 134 in sequence and equidistantly, so that when the strip contacts the nut of the screw, the screw will be adsorbed on the surface of the conveyor belt 134 under the magnetic force of the permanent magnet frame 132, and then as the conveyor belt 134 rotates, the screws move downward in sequence, first the screw moves to the position of the third detection piece 126, the end point of the screw stud will squeeze the third detection piece 126, so that the third reset spring 125 is compressed, and at the same time, a relative displacement occurs between the third grating reading head 127 and the third scale grating 128, and then the displacement of the third detection piece 126 is detected, and the length of the screw can be known by the displacement of the third detection piece 126.

[0022] When the screw moves to the position of the air nozzle 129, the air pump 130 is started to blow air into the air nozzle 129, causing the air nozzle 129 to eject airflow, which blows toward the stud part of the screw. Since the resistance of the threaded screw and the screw without thread to the flowing air is different, the force conditions of the screw are also different, so the pressure of the nut of the screw on the pressure plate 131 is different. When the screw is subjected to a large force from the airflow, the pressure detected by the force-sensitive resistor 135 will increase. By detecting the change in the resistance value of the force-sensitive resistor 135 itself, the specific condition of the thread on the screw can be known (the flow rate of the airflow needs to be kept constant).

[0023] When the screw moves to the position of the second detection piece 117, the nut will move against the second detection piece 117, causing the second detection piece 117 to be displaced. The displacement is along the axial direction of the screw. At this time, the second reset spring 110 is compressed, and the second scale grating 119 is displaced relative to the second grating reading head 118, thereby detecting the displacement of the second detection piece 117 and then knowing the thickness of the screw nut. At the same time, according to the specific diameter of the screw, the second detection piece adjustment wheel 115 can be rotated. The rotation of the second detection piece adjustment wheel 115 drives the second detection piece adjustment screw 114 to move axially, thereby adjusting the position of the second detection piece 117. Since the second grating reading head bracket 116 is slidably installed on the slide rail 113, it will also drive the second grating reading head 118 to move together, ensuring that the relative position of the second grating reading head 118 and the second scale grating 119 remains unchanged.

[0024] When the screw moves to the position of the two first detection pieces 105, the stud part of the screw will squeeze the two first detection pieces 105, so that the two first detection pieces 105 are separated from each other, and the corresponding first reset spring 104 is compressed, and a relative displacement occurs between the first scale grating 106 and the first grating reading head 107, so that the displacement of the two first detection pieces 105 can be detected. By adding the displacement of the two first detection pieces 105, the diameter of the screw stud can be known. This is because the position of the screw on the conveyor belt 134 cannot guarantee accuracy. By superimposing the values ​​of the two first detection pieces 105, the diameter of the screw stud can be measured regardless of how the screw is placed.

[0025] The screw continues to move downward, so that the screw is separated from the conveyor belt 134. When the screw moves to the support block 133, it will no longer be constrained by the magnetic force of the conveyor belt 134, and thus fall under the action of gravity.

Claims

1. An online screw size detection system, characterized by: The invention comprises two supporting side plates (120) arranged in parallel, wherein an air nozzle (129) is fixedly mounted on the top of one of the supporting side plates (120), a third detection piece support frame (123) is also fixedly mounted between the two supporting side plates (120), and a third detection piece (126) is slidably mounted on the third detection piece support frame (123) via two third detection piece support rods (124) arranged in parallel, for detecting the length of the screw; A frame (101), a permanent magnet frame (132) and a support block (133) are also fixedly installed between the two support side plates (120), wherein the permanent magnet frame (132) and the support block (133) are fixedly matched, and a conveyor belt (134) is provided on the outer rotating sleeves of the permanent magnet frame (132) and the support block (133), and a plurality of blocking bars are equidistantly provided on the surface of the conveyor belt (134) for moving the screw; Two symmetrically arranged first detection sheet support plates (102) are fixedly mounted on the frame (101), and a first detection sheet (105) is slidably mounted on the first detection sheet support plate (102) via two parallelly arranged first detection sheet support rods (103), for detecting the diameter of the screw; A second detection sheet support frame (108) is fixedly mounted on the frame (101), and a second detection sheet (117) for detecting the thickness of a screw nut is arranged on the second detection sheet support frame (108); A sunken groove (122) is provided on the permanent magnet frame (132) at the position of the air jet nozzle (129); one end of the inner wall of the sunken groove (122) is movably connected to a pressure plate (131); a force sensitive resistor bracket (136) is fixedly installed on the side of the permanent magnet frame (132); the force sensitive resistor bracket (136) is in contact with the pressure plate (131), and a force sensitive resistor (135) is overlapped on the contact surface; A second detection piece adjustment bracket (112) is slidably mounted on the second detection piece support frame (108) via two second detection piece support rods (109) arranged in parallel, and a second detection piece (117) is slidably mounted on the second detection piece adjustment bracket (112) via a second detection piece adjustment slide rod (111) and a second detection piece adjustment screw rod (114), wherein a second detection piece adjustment wheel (115) is threadedly sleeved on the second detection piece adjustment screw rod (114), and the second detection piece adjustment wheel (115) is rotatably matched with the second detection piece adjustment bracket (112); a second reset spring (110) is disposed around each second detection piece support rod (109), and both ends of the second reset spring (110) are fixed to the second detection piece adjustment bracket (112) and the second detection piece support frame (108); and a second detection piece adjustment bracket (112) is provided with a second detection piece adjustment wheel (115) on the second detection piece adjustment bracket (112) via a slide rail (113). A second grating reading head bracket (116) is slidably mounted, a second grating reading head (118) is fixedly mounted on the second grating reading head bracket (116), a second scale grating (119) matching with the second grating reading head (118) is fixedly mounted on the second detection sheet (117), and the second grating reading head bracket (116) is slidably matched with the second detection sheet support bracket (108); a first scale grating (106) is fixedly mounted on the first detection sheet (105), and a first grating reading head (107) matching with the first scale grating (106) is fixedly mounted on the first detection sheet support plate (102); a third grating reading head (127) is fixedly mounted on the third detection sheet (126), and a third scale grating (128) matching with the third grating reading head (127) is fixedly mounted on the supporting side plate (120) of the fixed air jet nozzle (129); When the screw moves to the position of the air nozzle (129), the air nozzle (129) ejects air, and the ejected air blows toward the stud portion of the screw. Since the resistance of the screw with threads and the screw without threads to the flowing air is different, the force conditions of the screw are also different, so the pressure of the nut of the screw on the pressure plate (131) is different. When the screw is subjected to a large force of the air flow, the pressure detected by the force-sensitive resistor (135) will increase. By detecting the change in the resistance value of the force-sensitive resistor (135), the specific condition of the thread on the screw can be known. It is necessary to ensure that the flow rate of the air flow is constant.

2. The screw size online detection system according to claim 1, characterized in that: The air nozzle (129) is supplied with gas by an air pump (130). A supporting side plate (120) to which the air nozzle (129) is not fixed is provided with a slot, and a windshield plate (121) is fixedly mounted on the slot to shield the airflow ejected from the air nozzle (129) and prevent the airflow from blowing onto the pressure plate (131).

3. The screw size online detection system according to claim 2, characterized in that: A third reset spring (125) is disposed around each third detection piece support rod (124), and two ends of the third reset spring (125) are fixed to the third detection piece support frame (123) and the third detection piece (126); A first return spring (104) is disposed around each first detection piece support rod (103), and two ends of the first return spring (104) are fixed to the first detection piece (105) and the first detection piece support plate (102).

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