An even drying UV ink print curing device

Abstract

The present application relates to the printing technical field, and discloses a kind of UV ink printing curing device of uniform drying, including workbench, the rotating table plate is coaxially connected above the workbench, and outer ring engagement transmission connection has synchronous belt, the rotating table plate is annular array with several curing covers on, and the inside of curing cover is provided with and the gear of rotating connection of rotating table plate and connecting rod;The inside of the side of the workbench close to U-shaped section is slidably embedded with setting ring, and the two sides of setting ring are respectively provided with tooth one and tooth two, when the gear and tooth one engage, transmission curing cover lifts, when the gear and tooth two engage, transmission curing cover drops.This scheme, by setting rotating table plate, double-sided synchronous belt and setting steering wheel two at reversing position, the differential rotation of rotating table plate and tray is realized, so that tray is separated from the inside of rotating table plate, or enter the inside of curing cover, guarantee the ink of material in tray enough long exposure time.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of printing, in particular to a uniform drying UV ink printing curing device. BACKGROUND

[0002] UV (ultraviolet light curing) ink refers to the use of ultraviolet light of different wavelengths and energy to polymerize monomers in the ink binder into polymers under ultraviolet irradiation, so that the ink is film-formed and dried. UV ink also belongs to ink, has bright color, good printing suitability, suitable curing and drying rate. At the same time, it has good adhesion, and has the characteristics of wear resistance, corrosion resistance, weather resistance, etc. After printing, the UV ink is conveyed to the lower side of the ultraviolet lamp by the conveying belt, and is cured by the irradiation of the ultraviolet lamp, completing the production.

[0003] In the UV light curing process, the intensity of the light source, the wavelength of the light, the exposure time, the selection and concentration of the photosensitizer, the absorption performance of the material, the temperature and humidity, and the characteristics of the material all affect the efficiency of UV light curing. Among them, for temperature and humidity, higher temperature and lower humidity are conducive to the efficiency of curing, and for exposure time, the longer the better the curing efficiency.

[0004] The existing UV light curing device usually has a printing structure and a conveying belt structure, and an ultraviolet lamp parallel to the conveying belt surface is fixedly installed above the conveying belt structure. The space below the ultraviolet lamp is directly connected with the outside, so the irradiation area of the ultraviolet lamp is usually also at room temperature. The conveying belt moves at a constant speed under the action of the motor, so the contact time between the curing object on the conveying belt and the ultraviolet lamp is only the width of the ultraviolet lamp. In order to ensure the curing effect and avoid increasing the cost, the conveying speed of the conveying belt is usually reduced, which reduces the production efficiency to a certain extent. Therefore, the present application provides a uniform drying UV ink printing curing device to solve the above problems. SUMMARY

[0005] In order to solve the problem that the curing structure of the existing UV light curing device has poor control ability for temperature and exposure time, the present application provides a uniform drying UV ink printing curing device.

[0006] The uniform drying UV ink printing curing device provided by the present application adopts the following technical scheme:

[0007] A kind of even dry UV ink printing curing device, including workbench, the workbench is two-stage structure, the top view section is circular, the other section is U-shaped structure along the radius of circle, the middle section of the U-shaped structure is provided with feeding mechanism and discharging mechanism respectively, the circular section of the workbench is coaxially rotatably connected with rotating platform plate, and the outer ring of rotating platform plate is meshed driving connection with synchronous belt, the bottom center position of rotating platform plate is provided with motor for device driving, the outside of synchronous belt is provided with two deflection rollers two, the inside is provided with deflection roller one, synchronous belt is sequentially passed through discharging mechanism and feeding mechanism under the action of deflection roller two and deflection roller one;

[0008] Several trays are evenly distributed on the synchronous belt, the tray is slowed down at the position of deflection roller one and deflection roller two;

[0009] There are several curing covers in annular array on the rotating platform plate, and the inside of the curing cover is provided with a gear rotatably connected with the rotating platform plate, the outer wall of the gear is fixedly connected with an eccentric pin shaft, and the eccentric pin shaft and the curing cover are rotatably connected with a connecting rod;

[0010] The inside of the side of the workbench close to the U-shaped section is slidably embedded with a mounting ring, and the two sides of the mounting ring are respectively provided with a first pawl and a second pawl, when the gear is engaged with the first pawl, the transmission curing cover is lifted, and when the gear is engaged with the second pawl, the transmission curing cover is lowered;

[0011] The lifting position of the curing cover corresponds to the deflection roller two close to the discharging mechanism, and the lowering position of the curing cover corresponds to the deflection roller two close to the feeding mechanism;

[0012] The inside of the curing cover is provided with a heating resistance wire and an ultraviolet light source, and when the curing cover is lowered to the lowest position, the heating resistance wire and the ultraviolet light source start to work.

[0013] Preferably, the two sections above the U-shaped section of the workbench are arranged in parallel under the action of the deflection roller one and the deflection roller two, the time for the synchronous belt to pass through the position of the deflection roller two is t=(2πr1×90°) / (360°×v), and the time for the rotating platform plate to pass through the position of the deflection roller two is t=(2πr2×24°) / (360°×v).

[0014] Preferably, the rotating platform plate has a sliding groove structure matched with the curing cover in annular array, the sliding groove structure includes a first sliding groove and a second sliding groove, the first sliding groove is slidably embedded with one side of the curing cover, the gear is rotatably connected to the inside of the second sliding groove, and the bottom end of the gear protrudes from the lower end surface of the rotating platform plate.

[0015] Preferably, the first sliding groove is provided with a conductive groove on one side, and the bottom end of the first sliding groove is provided with a contact switch.

[0016] Preferably, the curing cover is a rectangular structure with an open bottom, the ultraviolet light source is fixedly connected to the top of the curing cover, the heating resistance wire is fixedly connected to the two side walls of the curing cover, and the height of the two side walls of the curing cover is smaller than that of the other two side walls, the side wall of the curing cover close to the rotating table is slidingly fitted between the rotating table, and the side wall is welded with a conductive rod outside, the conductive rod is slidingly fitted in the conductive groove, and when the curing cover is at the lowest position, the conductive rod and the conductive groove are connected, and the contact switch is triggered at the same time.

[0017] Preferably, during the rotation of the rotating table, a tray is arranged below each falling curing cover.

[0018] Preferably, the synchronous belt is a double-sided synchronous belt, and the outer wall of the rotating table is provided with a clamping tooth groove matched with the double-sided synchronous belt.

[0019] Preferably, the inner side of the tray is symmetrically provided with a clamping plate one and a clamping plate two, and the clamping plate one and the clamping plate two are elastically connected with the inner wall of the tray, and the tray is provided with a through hole penetrating the tray at a position deviated from the clamping plate one and the clamping plate two.

[0020] Preferably, the discharging mechanism comprises a discharging groove and two air cylinders fixedly connected to the inner side of the discharging groove, the outer side of the air cylinder is fixedly connected with a support, and the support and the inner wall of the discharging groove are welded, and the position of the air cylinder corresponds to the through hole.

[0021] In summary, the present application has the following at least one beneficial technical effect:

[0022] 1. By arranging the rotating table, and arranging the double-sided synchronous belt outside the rotating table, arranging the steering wheel two at the reversing position of the double-sided synchronous belt, realizing the differential operation of the rotating table and the tray, making the tray out of the inner side of the rotating table, or entering the inner side of the curing cover, so as to realize the stable arrangement between the tray and the curing cover, and ensure that the ink of the material in the tray has a long enough exposure time;

[0023] 2. By arranging the mounting ring below the discharging position of the rotating table, and arranging the gear and the connecting rod inside the rotating table, using the meshing transmission between the gear, the connecting rod, the clamping tooth one and the clamping tooth two, realizing the lifting and lowering of the position of the curing cover, so as to cooperate with the tray and the curing cover, and ensure that the tray can be stably embedded in the inner side of the curing cover.

[0024] 3. By arranging the conductive groove at the sliding groove structure position of the rotating table, and arranging the conductive rod corresponding to the conductive groove on the outer wall of the curing cover, cooperating with the gear and the connecting rod structure to adjust the height of the curing cover, realizing the electrical connection of the device in the working position, and disconnecting in the non-working position, so as to improve the energy saving of the device. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is an isometric view of the structure of the application.

[0026] Figure 2 is a back isometric view of the structure of the application.

[0027] Figure 3 is a bottom isometric view of the structure of the application.

[0028] Figure 4 is a top isometric view of the transmission mechanism of the structure of the application.

[0029] Figure 5 is a bottom isometric view of the transmission mechanism of the structure of the application.

[0030] Figure 6 is a top view of the transmission disc of the structure of the application.

[0031] Figure 7 is a front isometric view of the lifting mechanism of the structure of the application.

[0032] Figure 8 is a back isometric view of the lifting mechanism of the structure of the application.

[0033] Figure 9 is a view of the inside of the curing cover of the structure of the application.

[0034] Figure 10 is a view of the tray of the structure of the application.

[0035] Figure 11 is an enlarged view of A of the structure of the application.

[0036] Figure 12 is an enlarged view of B of the structure of the application.

[0037] BRIEF DESCRIPTION OF THE DRAWINGS: 1, workbench; 2, feeding mechanism; 3, discharging chute; 4, rotating table plate; 401, sliding groove structure; 4011, sliding groove one; 4012, sliding groove two; 402, conductive groove; 5, synchronous belt; 6, curing cover; 7, steering wheel one; 8, steering wheel two; 9, tray; 901, clamping plate one; 902, through hole; 903, clamping plate two; 10, support; 11, air cylinder; 12, motor; 13, setting ring; 1301, clamping tooth one; 1302, clamping tooth two; 14, gear; 15, connecting rod; 16, conductive rod; 17, pin shaft; 18, contact switch; 19, heating resistance wire; 20, ultraviolet light source. DETAILED DESCRIPTION

[0038] The following description will be made in conjunction with the accompanying drawings. Figure 1 - the accompanying drawings Figure 12Further details of the present application are provided below.

[0039] Embodiment one: refer to Figures 1-12 A kind of even dry UV ink printing solidification device, including workbench 1, workbench 1 is two-stage structure, the top view section is circular, another section is the U-shaped structure along the radius of circle, the middle section of U-shaped structure is provided with feeding mechanism 2 and discharging mechanism respectively, feeding mechanism 2 and discharging mechanism are all fixedly connected between bolt and workbench 1, can be replaced according to actual demand, to adapt to the kind of different to be solidified processing, the top of the circular section of workbench 1 is coaxially connected with rotating table plate 4, and the outer ring of rotating table plate 4 is meshing transmission connection with synchronous belt 5, synchronous belt 5 is double-sided synchronous belt 5, the outer wall of rotating table plate 4 is provided with the click slot matched with double-sided synchronous belt 5, the bottom center position of rotating table plate 4 is provided with motor 12 for device driving, the outer side of synchronous belt 5 is provided with two steering wheels two 8, and the inner side is provided with steering wheel one 7, synchronous belt 5 passes through discharging mechanism and feeding mechanism 2 in turn under the action of steering wheel two 8 and steering wheel one 7;

[0040] Synchronous belt 5 is evenly distributed with several trays 9, tray 9 is slowed down through the position of steering wheel one 7 and steering wheel two 8, synchronous belt 5 is located above the U-shaped section of workbench 1 under the action of steering wheel one 7 and steering wheel two 8, and the two sections are parallelly arranged, the time of synchronous belt 5 rotating through the position of steering wheel two 8 is t=(2πr1×90°) / (360°×v), the time of rotating table plate 4 rotating through the position of steering wheel two 8 is t=(2πr2×24°) / (360°×v), because synchronous belt 5 and rotating table plate 4 are meshing transmission, the rotating speed v of rotating table plate 4 and synchronous belt 5 is same, the radius r1 of synchronous belt 5 at steering wheel two 8 is the distance between the axis of tray 9 and steering wheel two 8, r2 is the radius of rotating table plate 4, and 24° is the included angle between adjacent two curing covers 6, when the ratio of r1*90° and r2*24° is appropriate, at click one 1301 position, curing cover 6 rises, at the same time, rotating table plate 4 drives curing cover 6 to keep the original speed, and tray 9 rotates around the outside of steering wheel two 8 at the position of steering wheel two 8, the distance of tray 9 rotating around the outer ring of rotating table plate 4 in the same time is limited, therefore, distance difference appears between tray 9 and curing cover 6, so that tray 9 is separated from the inside of curing cover 6;

[0041] At click two 1302 position, curing cover 6 descends, and the movement mode of curing cover 6 and tray 9 at this position is opposite to that at click one 1301 position, therefore, curing cover 6 can be wrapped outside tray 9 under the action of rotating table plate 4;

[0042] The rotating base plate 4 has a sliding groove structure 401 in annular array matched with the curing cover 6, the sliding groove structure 401 comprises a sliding groove one 4011 and a sliding groove two 4012, the sliding groove one 4011 and one side of the curing cover 6 are slidingly fitted, the gear 14 is rotatably connected to the inner side of the sliding groove two 4012, and the bottom end of the gear 14 protrudes from the lower end surface of the rotating base plate 4, the sliding groove one 4011 and the sliding groove two 4012 are T-shaped in top view, and the sliding groove one 4011 and the curing cover 6 are transitionally fitted to ensure the stable movement in the vertical direction, the sliding groove two 4012 and the gear 14 are gap-fitted, the sliding groove two 4012 is used for fixing the rotating shaft of the gear 14 and arranging the connecting rod 15, in the rotating process of the rotating base plate 4, the gear 14 does not contact the workbench 1, when the gear 14 moves to the position of the arranging ring 13 under the action of the rotating base plate 4, it first contacts the catch one 1301, at this time, the gear 14 rotates half a circle, the pin shaft 17 rotates from the bottom end to the top end, at this time, the curing cover 6 is displaced upward to the maximum stroke under the transmission of the connecting rod 15, and remains stable, at this time, the gear 14 is located in the middle position of the arranging ring 13 and does not contact the catch, after moving through the parallel segment position of the synchronous belt 5, the gear 14 continues to move half a circle under the action of the catch two 1302, and the curing cover 6 falls down, and finally the coating on the tray 9 is completed.

[0043] The sliding groove one 4011 is provided with a conductive groove 402 on one side, and the bottom end of the sliding groove one 4011 is provided with a contact switch 18; the curing cover 6 is a rectangular parallelepiped structure with an open bottom, the ultraviolet light source 20 is fixedly connected to the top of the curing cover 6, and the heating resistance wire 19 is fixedly connected to the two side walls of the curing cover 6, and the height of the two side walls of the curing cover 6 is smaller than that of the other two side walls, the height of the two side walls provided with the heating resistance wire 19 is small to ensure the butt joint with the tray 9, when the curing cover 6 is located at the lowest position, the top of the tray 9 is gap-fitted with the two side walls of the curing cover 6, so as to reduce the interaction with the external air, so that the internal air is heated faster, and the curing is facilitated, the side wall of the curing cover 6 close to the rotating base plate 4 is slidingly fitted with the rotating base plate 4, and the outer side of the side wall is welded with a conductive rod 16, the conductive rod 16 is slidingly fitted in the inner side of the conductive groove 402, when the curing cover 6 is located at the lowest position, the conductive rod 16 and the conductive groove 402 are connected, and the contact switch 18 is triggered at the same time, the conductive rod 16 and the conductive groove 402 are used for providing the ultraviolet light source 20 and the heating resistance wire 19 with electric energy, and the contact switch 18 and the conductive rod 16 and the conductive groove 402 provide double protection for the device, only when both are connected, the device can work;

[0044] The rotating base plate 4 has a sliding groove structure 401 in annular array matched with the curing cover 6, the sliding groove structure 401 comprises a sliding groove one 4011 and a sliding groove two 4012, the sliding groove one 4011 and one side of the curing cover 6 are slidingly fitted, the gear 14 is rotatably connected to the inner side of the sliding groove two 4012, and the bottom end of the gear 14 protrudes from the lower end surface of the rotating base plate 4, the sliding groove one 4011 and the sliding groove two 4012 are T-shaped in top view, and the sliding groove one 4011 and the curing cover 6 are transitionally fitted to ensure the stable movement in the vertical direction, the sliding groove two 4012 and the gear 14 are gap-fitted, the sliding groove two 4012 is used for fixing the rotating shaft of the gear 14 and arranging the connecting rod 15, in the rotating process of the rotating base plate 4, the gear 14 does not contact the workbench 1, when the gear 14 moves to the position of the arranging ring 13 under the action of the rotating base plate 4, it first contacts the catch one 1301, at this time, the gear 14 rotates half a circle, the pin shaft 17 rotates from the bottom end to the top end, at this time, the curing cover 6 is displaced upward to the maximum stroke under the transmission of the connecting rod 15, and remains stable, at this time, the gear 14 is located in the middle position of the arranging ring 13 and does not contact the catch, after moving through the parallel segment position of the synchronous belt 5, the gear 14 continues to move half a circle under the action of the catch two 1302, and the curing cover 6 falls down, and finally the coating on the tray 9 is completed.

[0045] During the rotation of the rotating platform 4, a tray 9 is arranged below each of the falling curing covers 6, so that the workpiece in the tray 9 is continuously cured during the rotation of the rotating platform 4, thereby ensuring the exposure time and ensuring complete curing;

[0046] The inner side of the workbench 1 near the U-shaped section is slidably embedded with a mounting ring 13, and the two sides of the mounting ring 13 are respectively provided with a first clamping tooth 1301 and a second clamping tooth 1302. When the gear 14 and the first clamping tooth 1301 are engaged, the curing cover 6 is lifted, and when the gear 14 and the second clamping tooth 1302 are engaged, the curing cover 6 is lowered.

[0047] The lifting position of the curing cover 6 corresponds to the deflection wheel two 8 near the discharging mechanism, and the lowering position of the curing cover 6 corresponds to the deflection wheel two 8 near the feeding mechanism 2.

[0048] The inner side of the curing cover 6 is provided with a heating resistance wire 19 and an ultraviolet light source 20, and when the curing cover 6 is lowered to the lowest position, the heating resistance wire 19 and the ultraviolet light source 20 start to work.

[0049] The inner side of the tray 9 is symmetrically provided with a first clamping plate 901 and a second clamping plate 903, and the first clamping plate 901 and the second clamping plate 903 are elastically connected with the inner wall of the tray 9. A through hole 902 is formed in the bottom of the tray 9, which is offset from the positions of the first clamping plate 901 and the second clamping plate 903. The top end of the second clamping plate 903 has an opening to the outside, which facilitates the feeding mechanism 2 to place the material coated with the printing material into the tray 9. The clamping plate is stable in the tray 9 under the action of the elastic sheet. The discharging mechanism includes a discharging chute 3 and two air cylinders 11 fixedly connected to the inner side of the discharging chute 3. The outer side of the air cylinder 11 is fixedly connected with a support 10, and the support 10 and the inner wall of the discharging chute 3 are welded. The position of the air cylinder 11 corresponds to the through hole 902. When the tray 9 passes through this position, the air cylinder 11 is quickly extended and retracted. The extended air cylinder 11 passes through the through hole 902 and contacts the bottom of the workpiece, so that the workpiece is ejected from the tray 9 and enters the discharging chute 3, and then falls downward through the discharging chute 3.

[0050] It should be noted that in this text, terms such as "including", "containing" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0051] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A uniform drying UV ink printing and curing device, comprising a workbench (1), the workbench (1) is in two-section structure, the top view section is circular, the other section is U-shaped structure arranged along the radius of the circle, the middle section of the U-shaped structure is respectively provided with a feeding mechanism (2) and a discharging mechanism, characterized in that: The circular segment of the workbench (1) is coaxially connected with a rotating table plate (4), the outer ring of the rotating table plate (4) is meshingly connected with a synchronous belt (5), the bottom center of the rotating table plate (4) is provided with a motor (12) for driving, the outer side of the synchronous belt (5) is provided with two second steering wheels (8), the inner side is provided with a first steering wheel (7), the synchronous belt (5) passes through the feeding mechanism and the feeding mechanism (2) in turn under the action of the second steering wheel (8) and the first steering wheel (7). A plurality of trays (9) are evenly distributed on the synchronous belt (5), the trays (9) pass through the first steering wheel (7) and the second steering wheel (8) positions at a low speed. A plurality of curing covers (6) are arranged in an annular array on the rotating table plate (4), the inner side of the curing cover (6) is provided with a gear (14) rotatably connected with the rotating table plate (4), the outer wall of the gear (14) is fixedly connected with an eccentric pin shaft (17), and the eccentric pin shaft (17) and the curing cover (6) are rotatably connected with a connecting rod (15). The inner side of the workbench (1) near the U-shaped segment is slidably embedded with a mounting ring (13), the two sides of the mounting ring (13) are respectively provided with a first tooth (1301) and a second tooth (1302), when the gear (14) and the first tooth (1301) are meshed, the transmission curing cover (6) is lifted, when the gear (14) and the second tooth (1302) are meshed, the transmission curing cover (6) is lowered. The lifting position of the curing cover (6) corresponds to the second steering wheel (8) near the feeding mechanism, and the lowering position of the curing cover (6) corresponds to the second steering wheel (8) near the feeding mechanism (2). The inner side of the curing cover (6) is provided with a heating resistance wire (19) and an ultraviolet light source (20), and when the curing cover (6) is lowered to the lowest position, the heating resistance wire (19) and the ultraviolet light source (20) start work.

2. A uniform dried UV ink print curing device as claimed in claim 1, wherein: The synchronous belt (5) is parallel to the two segments above the U-shaped segment of the workbench (1) under the action of the first steering wheel (7) and the second steering wheel (8), the time for the synchronous belt (5) to pass through the position of the second steering wheel (8) is t=(2πr1×90°) / (360°×v), and the time for the rotating table plate (4) to pass through the position of the second steering wheel (8) is t=(2πr2×24°) / (360°×v).

3. A uniform dried UV ink printing curing device as claimed in claim 1, wherein: The rotating table plate (4) is provided with a chute structure (401) matched with the curing cover (6) in an annular array, the chute structure (401) comprises a first chute (4011) and a second chute (4012), the first chute (4011) is slidably embedded with one side of the curing cover (6), the gear (14) is rotatably connected to the inner side of the second chute (4012), and the bottom end of the gear (14) protrudes from the lower end surface of the rotating table plate (4).

4. A uniform dried UV ink print curing device as claimed in claim 3, wherein: The side of the first chute (4011) is provided with a conductive groove (402), and the bottom end of the first chute (4011) is provided with a contact switch (18).

5. A uniform dried UV ink print curing device as claimed in claim 4, wherein: The curing cover (6) is a bottom-opened cuboid structure, the ultraviolet light source (20) is fixedly connected to the top of the curing cover (6), the heating resistance wire (19) is fixedly connected to the two side walls of the curing cover (6), the height of the two side walls is smaller than that of the other two side walls, the curing cover (6) is slidingly fitted between the side wall close to the rotating table plate (4) and the rotating table plate (4), the side wall is welded with the electrically-conductive rod (16) outside, the electrically-conductive rod (16) is slidingly fitted in the electrically-conductive groove (402), when the curing cover (6) is at the lowest position, the electrically-conductive rod (16) and the electrically-conductive groove (402) are connected, and the contact switch (18) is triggered.

6. A uniform dried UV ink printing curing device as claimed in claim 1, wherein: During the rotation of the rotating table plate (4), each falling curing cover (6) is provided with a tray (9) below.

7. A uniform dried UV ink printing curing device as claimed in claim 1, wherein: The synchronous belt (5) is a double-sided synchronous belt (5), and the outer wall of the rotating table plate (4) is provided with a clamping tooth groove matched with the double-sided synchronous belt (5).

8. A uniform dried UV ink printing curing device as claimed in claim 1, wherein: The inner side of the tray (9) is symmetrically provided with a clamping plate one (901) and a clamping plate two (903), and the clamping plate one (901) and the clamping plate two (903) are elastically connected with the inner wall of the tray (9), and the bottom of the tray (9) is provided with a through hole (902) penetrating the tray (9) at a position deviated from the clamping plate one (901) and the clamping plate two (903).

9. A uniform dried UV ink print curing device as claimed in claim 8, wherein: The blanking mechanism comprises a blanking groove (3) and two air cylinders (11) fixedly connected to the inner side of the blanking groove (3), the outer side of the air cylinder (11) is fixedly connected with a support (10), and the support (10) and the inner wall of the blanking groove (3) are welded, and the position of the air cylinder (11) corresponds to the through hole (902).

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