Press fit mechanism

Abstract

The invention relates to a pressing mechanism. The pressing mechanism comprises a linear module; the pressing module is matched with the linear module, the linear module can drive the pressing module to move so that the pressing module can make contact with the workpiece to be detected, the pressing module comprises a base and a pressing table, the pressing table is in sliding connection with the base, and an elastic reset piece is arranged between the pressing table and the base; and the detection module comprises a grating ruler and a reading head which are matched with each other, the grating ruler is mounted on the linear module, and the reading head is connected with the pressing table. After the pressing table makes contact with the workpiece to be measured, the base moves relative to the pressing table, the elastic reset piece elastically deforms, the pressing table is stably pressed on the workpiece to be measured, the position of the pressing table is kept unchanged, and the reading head is arranged on the pressing table, so that it is guaranteed that the length can be accurately measured; the press-fit assembly can detect the to-be-detected workpiece in the press-fit assembly process, so that the working procedures in the assembly process are reduced, and the assembly efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection, in particular to a pressing mechanism. BACKGROUND

[0002] In the lens manufacturing process, multiple lenses need to be installed into the lens barrel, that is, the lenses are pressed into the lens barrel one by one. In the prior art, a pressing device can be used to assemble the lenses and the lens barrel. In order to ensure the installation precision, the thickness of the lens barrel and the total thickness of the lens and the lens barrel after the lens is installed into the lens barrel each time need to be detected, so as to determine whether the lens is installed in place. However, the following problems exist in the current measurement of the thickness of the lens and / or the lens barrel:

[0003] In order to improve the measurement precision, when measuring the total thickness of the lens and the lens barrel, the measurement head is preferably in direct contact with the lens. Moreover, since multiple lenses need to be installed into the same lens barrel, the assembly deviation of each lens can cause the lens to be scrapped, and therefore the thickness of the lens barrel and the lens needs to be detected after the lens is installed into the lens barrel each time. It can be found that the pressing device and the detector need to be in contact with the lens to realize assembly and detection, and therefore two processes of pressing and detection are required each time, which results in low production efficiency. SUMMARY

[0004] In order to solve the above technical problems, the present application provides the following technical solutions:

[0005] The present application provides a pressing mechanism, comprising:

[0006] a linear module;

[0007] a pressing module, the pressing module is matched with the linear module, the pressing module comprises a base and a pressing table, the pressing table is slidably connected with the base, and an elastic reset member is arranged between the pressing table and the base;

[0008] a detection module, the detection module comprises a grating ruler and a reading head matched with each other, the grating ruler is installed on the linear module, and the reading head is connected with the pressing table.

[0009] In one of the embodiments, the pressing table comprises a connecting plate and a pressing plate unit, the pressing plate unit is provided with a pressing head, the elastic reset member abuts against one end of the connecting plate, and the pressing plate unit is connected to the other end of the connecting plate.

[0010] In one of the embodiments, the base comprises a bottom plate, a top plate and a limiting plate, the top plate and the limiting plate are respectively connected to the bottom plate, the other end of the elastic reset member abuts against the top plate, and the connecting plate slides relative to the limiting plate.

[0011] In one of the embodiments, the connecting plate is provided with a sliding groove, and a sliding block of the limiting plate is located in the sliding groove.

[0012] In one embodiment, the pressing module further comprises a pressure sensor arranged between the connecting plate and the elastic reset member.

[0013] In one embodiment, the pressing plate unit has at least two hollow grooves penetrating therethrough, and the hollow grooves are distributed circumferentially around the periphery of the pressing head.

[0014] In one embodiment, the pressing module is driven by the linear module to move along a first linear direction, and the scale is installed on the linear module along the first linear direction.

[0015] In one embodiment, the linear module comprises a linear slide having a movable end, and the pressing module is installed on the movable end of the linear slide, and the scale is installed on the side of the linear slide.

[0016] In one embodiment, the pressing platform has a mounting block, and the reading head is connected to the mounting block, and the reading head is arranged on the side of the linear slide and faces the scale.

[0017] In one embodiment, a guide unit is connected between the pressing platform and the base.

[0018] The present application has at least the following beneficial effects:

[0019] In the present application, the pressing platform is used to contact the workpiece to be measured for pressing assembly, and the elastic reset member arranged between the pressing platform and the base can prevent the pressing platform from damaging the workpiece to be measured. At the same time, after the pressing platform contacts the workpiece to be measured, the position of the pressing platform remains unchanged, and by arranging the reading head on the pressing platform, the length can be accurately measured, so that the workpiece to be measured can be detected during the pressing assembly process, thereby reducing the process during assembly and improving the efficiency of assembly. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The three-dimensional structural schematic diagram of the pressing mechanism provided by one embodiment of the present application in a first perspective view.

[0021] Figure 2 The three-dimensional structural schematic diagram of the pressing mechanism provided by one embodiment of the present application in a second perspective view.

[0022] Figure 3 The three-dimensional structural schematic diagram of the pressing module provided by one embodiment of the present application.

[0023] Figure 4 The three-dimensional structural schematic diagram of the pressing plate unit provided by one embodiment of the present application.

[0024] REFERENCE SIGNS:

[0025] 11, linear module;

[0026] 111, motor; 112, linear slide;

[0027] 12, detection module;

[0028] 121, ruler; 122, reading head;

[0029] 13, pressing module;

[0030] 131, base plate; 132, elastic reset member; 133, connecting plate; 134, mounting block; 135, pressing plate unit; 136, top plate; 137, pressure sensor; 138, limiting plate; 139, guide unit;

[0031] 1331, sliding groove;

[0032] 1351, pressing head; 1352, hollow groove; 1353, partition plate;

[0033] 1391, slide rail; 1392, sliding block. DETAILED DESCRIPTION

[0034] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described and it is therefore contemplated to cover all such modifications as fall within the scope of the application. It is to be understood that the application is not limited in its application to the details set forth in the description below.

[0035] In the description of the present application, it should be understood that if there are terms such as "length", "width", "thickness", "upper", "lower", "vertical", "inner", "outer", "radial", "circumferential", etc., these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0036] In addition, if there are terms "first", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of the indicated technical features. Therefore, the feature limited by "first" can explicitly or implicitly include at least one such feature. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0037] In the present application, unless specifically defined and limited otherwise, if there are terms such as "mount", "connect", "connect", "fix" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the present application, unless specifically defined and limited otherwise, if there are terms such as "mount", "connect", "connect", "fix" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The embodiments of the present application will be described in detail below with reference to the drawings.

[0040] Referring to Figure 1 , 2 As shown in the drawings, in some embodiments of the present application, a pressing mechanism is provided, comprising a linear module 11, a detection module 12 and a pressing module 13. The pressing module 13 cooperates with the linear module 11, the linear module 11 is used to drive the pressing module 13 to move along a linear conveying direction, and the pressing module 13 is used to press the workpiece to be measured. Under the driving of the linear module 11, the pressing module 13 contacts the workpiece to be measured, and then the detection module 12 detects the position of the pressing module 13 to judge the thickness of the workpiece to be measured. In the present scheme, the pressing module 13 comprises a base and a pressing table, the pressing table is in sliding connection with the base, and an elastic reset member 132 is arranged between the pressing table and the base. Under the driving of the linear module 11, the pressing module 13 moves towards the workpiece to be measured until the pressing table is pressed on the workpiece to be measured, and then the pressing table remains stationary relative to the workpiece to be measured. At the same time, the base moves relative to the pressing table, so that the elastic reset member 132 elastically deforms. The elastic reset member 132 is used to avoid rigid contact between the pressing table and the workpiece to be measured, and a certain force is applied to the pressing table by the elastic reset member 132 to stably press the workpiece to be measured, so as to ensure that the pressing table and the workpiece to be measured are in complete contact and improve the measurement accuracy.

[0041] The detection module 12 comprises a cooperating grating ruler 121 and a reading head 122, the reading head 122 can read the length according to the grating ruler 121, the grating ruler 121 is installed on the linear module 11, and the reading head 122 is connected with the pressing table. Specifically, the linear module 11 comprises a motor 111 and a linear slide 112, the linear slide 112 has a movable moving end, it is understood that the body of the linear slide 112 is in a fixed state (i.e. no displacement), and a movable moving end is arranged on the body of the linear slide 112, and under the driving of the motor 111, the movable moving end can move along a straight line direction relative to the body of the linear slide 112. Actually, the grating ruler 121 is installed on the body of the linear slide 112. And the reading head 122 is connected with the pressing table, the reading head 122 will move with the pressing assembly 13, more specifically, the reading head 122 first moves with the pressing table, then the pressing table is pressed on the workpiece to be measured, the reading head 122 keeps in a stationary state with the pressing table and the workpiece to be measured, and in the subsequent process of floating the base relative to the pressing table to ensure that the pressing table is completely pressed on the workpiece to be measured, the reading head 122 does not affect reading the length.

[0042] In the scheme, under the driving of the linear module 11, the pressing assembly 13 moves along the first linear direction, the grating ruler 121 is installed on the linear module 11 along the first linear direction, so that the reading head 122 moves along the first linear direction, specifically, the reading head 122 moves along the extension direction of the grating ruler 121. Exemplarily, in order to improve the height measurement accuracy, the grating ruler 121 can be an optical grating ruler. The displacement is measured by the change of the optical grating stripe, the position information is output, the position data is made on the optical grating in the form of coding by the grating lines with different widths and different pitches, the reading head 122 acquires the coding information and decodes the position information and displays, and the detection accuracy depends on the width and pitch of the grating lines.

[0043] The pressing mechanism provided in the application is mainly used for measuring the height of the lens and the lens barrel. In actual use, a plurality of lenses need to be sequentially loaded into the lens barrel. If the installation position of one of the lenses is wrong, it will affect the installation position of the subsequent lenses, thereby causing the product to be unqualified. In addition, because there is an error in the installation of the lenses, if the installation of the plurality of lenses all has errors, the cumulative error of the plurality of lenses will also cause the product to be unqualified. Therefore, the height of the lens barrel loaded with the lens each time needs to be measured to ensure that the height of the lens barrel after the installation of the lens each time is within a threshold range. The assembly of the lens and the lens barrel itself belongs to high-precision assembly technology, is sensitive to the installation position of the lens, and requires a high-precision detector.

[0044] Altitude detectors can be divided into contact and non-contact types. Non-contact detectors generally have lower accuracy and cannot meet the precision requirements of lens and lens barrel assembly. Although high-precision non-contact detectors exist, their cost and maintenance requirements are high. Contact detectors have two main problems: First, after the lens and lens barrel are installed, there is some slack. When the detector comes into contact with the lens, the lens may float, leading to inaccurate results. Second, if excessive force is applied after contacting the lens, both the detector and the lens risk damage.

[0045] In the pressing mechanism of this application, the pressing module 13 first presses the workpiece to be tested (i.e., the lens barrel containing the lens), and the detection module 12 detects the pressed lens to avoid the lens floating and affecting the detection accuracy of the detection module 12. Secondly, the detection module 12 does not come into contact with the lens to avoid damage to the detection module 12 due to impact.

[0046] This pressing mechanism can not only measure the height of the lens barrel containing the lens, but also perform a pressure-holding operation on the lens installed in the lens barrel to ensure that the lens can be installed in place and prevent the lens from shifting inside the lens barrel.

[0047] Furthermore, combined Figure 3 As shown, the pressure table includes a connecting plate 133 and a pressure plate unit 135. The pressure plate unit 135 has a pressure head 1351. An elastic reset member 132 abuts against one end of the connecting plate 133, and the pressure plate unit 135 is connected to the other end of the connecting plate 133. The connecting plate 133 and the pressure plate unit 135 are connected to form an L-shape. The pressure head 1351 and the connecting plate 133 are respectively located on opposite sides of the pressure plate unit 135, that is, the connecting plate 133 is connected to the upper surface of the pressure plate unit 135, and the pressure head 1351 is located on the lower surface of the pressure plate unit 135.

[0048] In addition, the base includes a bottom plate 131, a top plate 136, and a limiting plate 138. The top plate 136 and the limiting plate 138 are respectively connected to the bottom plate 131. The other end of the elastic reset member 132 abuts against the top plate 136. The bottom plate 131, the top plate 136, and the limiting plate 138 are connected in a U-shape. The connecting plate 133 is supported by the limiting plate 138. The limiting plate 138 is arranged parallel to the pressure plate unit 135, and the connecting plate 133 slides relative to the limiting plate 138, so that the pressure plate unit 135 approaches or moves away from the limiting plate 138.

[0049] More specifically, the connecting plate 133 is provided with a sliding groove 1331, and the slider of the limiting plate 138 is located in the sliding groove 1331. In this design, sliding grooves 1331 are provided on both sides of the connecting plate 133, and the limiting plate 138 has two protruding sliders, which are respectively inserted into the sliding grooves 1331. By moving the connecting plate 133 relative to the limiting plate 138, the sliders move relative to the sliding grooves 1331. The movement of the sliders is restricted by the two ends of the sliding grooves 1331, so that the limiting plate 138 restricts the movement distance of the connecting plate 133, that is, restricts the movement distance of the pressure table relative to the base, so as to avoid excessive deformation of the elastic reset member 132, which would cause problems in the pressing force applied by the pressure table to the workpiece under test and lead to damage to the workpiece under test.

[0050] The pressure plate unit 135 has a mounting groove, and one end of the connecting plate 133 is inserted into the mounting groove, so that the pressure plate unit 135 is connected to the connecting plate 133. In addition, the sliding groove 1331 is close to the end of the connecting plate 133 that connects to the pressure plate unit 135, and the lowest end face of the sliding groove 1331 in the vertical direction is not lower than the upper surface of the pressure plate unit 135, to prevent the limiting plate 138 from colliding with the pressure plate unit 135.

[0051] Furthermore, refer to Figure 4 As shown, the pressure plate unit 135 has at least two through-hole slots 1352, and multiple slots 1352 are circumferentially distributed around the periphery of the pressure head 1351. For example, the slots 1352 are fan-shaped, and there are three slots 1352. A partition 1353 is provided between adjacent fan-shaped slots 1352. The three slots 1352 form a ring-like perforated structure. The inner and outer sides of the perforated structure are connected by three partitions 1353. The pressure head 1351 is connected to a circular plate on the inner side of the perforated structure. The slots 1352 facilitate visual inspection equipment to observe the workpiece being pressed down by the pressure head 1351 from above the pressure plate unit 135.

[0052] In some embodiments of this application, the pressing module 13 further includes a pressure sensor 137, which is disposed between the connecting plate 133 and the elastic reset member 132. The pressure sensor 137 monitors the pressing force between the pressing platform and the workpiece to be tested. The pressure value monitored by the pressure sensor 137 determines the pressing state between the pressing platform and the workpiece to be tested, ensuring stable pressing between the pressing platform and the workpiece to be tested, thereby ensuring the accuracy of the workpiece data detected by the detection module 12.

[0053] It is understood that the installation position of the pressure sensor 137 includes, but is not limited to, between the connecting plate 133 and the elastic reset member 132. The pressure sensor 137 can also be installed between the elastic reset member 132 and the top plate 136, or inside the pressure table.

[0054] In addition, the pressure value monitored by the pressure sensor 137 can also avoid the pressure of the pressure table on the workpiece being too large, although the workpiece is not damaged, the workpiece appears to be offset (the assembly position is too deep), which leads to the quality of the product after assembly being unqualified.

[0055] In some embodiments of the present application, the pressure table has a mounting block 134, and the reading head 122 is connected to the mounting block 134. The reading head 122 is arranged on the side of the linear slide 112, so that the reading head 122 is close to the grating ruler 121. Specifically, one end of the mounting block 134 is connected to the connecting plate 133, the mounting block 134 extends to the side of the linear slide 112, and the reading head 122 is mounted on the other end of the mounting block 134.

[0056] For example, the mounting block 134 is arranged vertically on the connecting plate 133, and the pressing plate unit 135 is arranged in parallel with the mounting block 134. The pressing plate unit 135 and the mounting block 134 respectively extend outward from the corresponding two sides of the connecting plate 133, so that the pressing plate unit 135 is away from the linear slide 112, and the corresponding mounting block 134 is close to the linear slide 112.

[0057] In this scheme, the mounting block 134 moves with the connecting plate 133, and drives the reading head 122 to move relative to the grating ruler 121. After the reading head 122 obtains the position on the grating ruler 121, the height of the workpiece to be measured is obtained. Since the pressure table remains stationary with the workpiece to be measured after the pressure table is pressed against the workpiece to be measured, the distance between the reading head 122 connected to the pressure table and the grating ruler 121 also remains stationary after the pressure table is stationary. At this time, the data obtained by the reading head 122 is detected to obtain the actual height of the workpiece to be measured. Compared with the existing contact detector, the detection accuracy is higher. In addition, since the height measurement is performed simultaneously during the pressure maintaining process, the process is simplified, thereby improving the efficiency.

[0058] In some embodiments of the present application, the pressure table and the base are connected through a guide unit 139. Specifically, the guide unit 139 includes a slide rail 1391 and a slide block 1392. The slide block 1392 cooperates with the slide rail 1391, so that the slide block 1392 can slide on the slide rail 1391. The slide block 1392 is connected to the connecting plate 133, and the slide rail 1391 is mounted on the bottom plate 131. The connecting plate 133 moves relative to the bottom plate 131 under the limitation of the slide rail 1391. The extension direction of the slide rail 1391 is consistent with the first linear direction. The guide unit 139 guides the pressure table to be raised relative to the base, so that the pressure table is away from the linear slide 112 to avoid interference between the workpiece to be measured and the linear slide 112.

[0059] The above examples are used to further illustrate the present application, but do not limit the present application to these specific embodiments. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be understood as within the protection scope of the present application.

Claims

1. A press mechanism characterized by, Include: Linear module (11); Pressing module (13), the pressing module (13) is matched with the linear module (11), the pressing module (13) includes base and pressing table, the pressing table is slidably connected with the base, and the elastic reset member (132) is arranged between the pressing table and the base; Detection module (12), the detection module (12) includes matched grating ruler (121) and reading head (122), the grating ruler (121) is installed on the linear module (11), and the reading head (122) is connected with the pressing table.

2. The press mechanism of claim 1, wherein, The pressing table includes a connecting plate (133), the connecting plate (133) is slidably connected with the base, and the elastic reset member (132) is arranged between the connecting plate (133) and the base.

3. The press mechanism of claim 2, wherein, The connecting plate (133) is connected with a pressing plate unit (135), and the pressing plate unit (135) has a pressure head (1351).

4. The press mechanism of claim 3, wherein, The pressing plate unit (135) has at least two through hollow grooves (1352), and a plurality of hollow grooves (1352) are circumferentially distributed on the periphery of the pressure head (1351).

5. The press mechanism of claim 2, wherein, The base includes a bottom plate (131), a top plate (136) and a limiting plate (138), the top plate (136) and the limiting plate (138) are connected to the bottom plate (131) respectively, the elastic reset member (132) is located between the top plate (136) and the connecting plate (133), and the connecting plate (133) slides relative to the limiting plate (138).

6. The press mechanism of claim 5, wherein, The connecting plate (133) is provided with a sliding groove (1331), and a part of the limiting plate (138) is located in the sliding groove (1331).

7. The press mechanism of claim 2, wherein, The pressing module (13) further includes a pressure sensor (137), and the pressure sensor (137) is arranged between the connecting plate (133) and the elastic reset member (132).

8. The press mechanism according to any one of claims 1-7, wherein, Under the drive of the linear module (11), the pressing module (13) moves along a first linear direction, and the grating ruler (121) is installed on the linear module (11) along the first linear direction.

9. The press mechanism of claim 8, wherein, The pressing table has a mounting block (134), the reading head (122) is connected to the mounting block (134), the reading head (122) is arranged on the side surface of the linear slide (112), and the reading head (122) faces the grating ruler (121).

10. The press mechanism according to any one of claims 1-7, wherein, The pressing table and the base are connected with a guide unit (139).

Images