Drying equipment for ceramic product processing

Abstract

The utility model relates to the technical field of ceramic drying, in particular to drying equipment for ceramic product processing, which comprises a drying box body, a bearing plate and a working box, the bearing plate and the working box are movably arranged in the drying box body, and the working box is arranged on the outer side of the bearing plate. The number of the first racks is two, and the two first racks are arranged on the two sides of the bottom of the bearing plate correspondingly; the material plate is arranged at the top of the bearing plate; the ejection assembly is arranged in the working box and used for controlling the second rack to move to be attached to the material plate and ejecting the material plate out of the bearing plate. And the force storage assembly is arranged in the working box and used for storing and releasing force when the bearing plate moves outwards so as to drive the ejection assembly to work, and according to the drying equipment for ceramic product processing, when ceramic is dried and taken out, personnel cannot enter the drying box to work, and the working efficiency is improved. And the situation that personnel are uncomfortable or scalded due to the fact that the temperature in the drying box is too high is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic drying, in particular to a drying device for processing ceramic art products. Background Technique

[0002] Ceramics is a general term for pottery and porcelain, and it is also a kind of arts and crafts in our country. As far back as the Neolithic Age, there were rough and simple painted pottery and black pottery in our country. After the ceramic handicraft model is made, it needs to be dried.

[0003] However, in actual use, the traditional way of drying ceramics is to place the ceramic products on the rack one by one, and then move the rack into the drying box for drying. After drying, the personnel need to take down and transfer the dried ceramic products one by one. Since the temperature of the drying box is relatively high, it may make the personnel uncomfortable or scalded. For this reason, we propose a drying device for processing ceramic art products. Content of the Utility Model

[0004] A technical problem to be solved by this application is: during the drying process of ceramics, when loading and unloading them, it may cause discomfort or scalding to the personnel.

[0005] To solve the above technical problem, the embodiment of this application provides a drying device for processing ceramic art products, including a drying box body and a bearing plate movably arranged inside the drying box body, and further including: a working box, the working box is arranged outside the bearing plate;

[0006] A first rack, there are two first racks, and the two first racks are respectively arranged on both sides of the bottom of the bearing plate;

[0007] A material plate, the material plate is arranged on the top of the bearing plate;

[0008] A top-out assembly, the top-out assembly is arranged inside the working box, and is used to control the second rack to shift and fit the material plate, and top it out from the bearing plate;

[0009] A power storage assembly, the power storage assembly is arranged inside the working box, and is used to store power when the bearing plate moves outwards, and can be released, so as to drive the top-out assembly to work.

[0010] In some embodiments, a sealing plate is provided inside the drying box body. The sealing plate is disposed between the drying box body and the bearing plate. A drying box door is provided inside the drying box body. T-shaped plates II are provided on both sides of the drying box door. T-shaped grooves II are formed on both sides inside the drying box body. The T-shaped plates II are disposed inside the T-shaped grooves II and are in sliding contact with the drying box body. A top plate is provided at the top of the drying box door. Pneumatic support rods I are provided on both sides of the drying box body. A controller I is provided on one side of the drying box body for controlling the movement of the pneumatic support rods I. The top ends of the two pneumatic support rods I are respectively disposed at the bottoms of both ends of the top plate for driving the drying box door to lift. A ventilation opening is provided at the top of the drying box body for ensuring air circulation inside the drying box body. Heating grids are provided on multiple sides inside the drying box body for uniformly drying the ceramics inside the drying box body.

[0011] In some embodiments, two limiting plates are provided on the top of the bearing plate for limiting the material plate. T-shaped plates I are provided on both sides of the bearing plate. T-shaped grooves I are provided on both sides inside the drying box body. The T-shaped plates I are disposed inside the T-shaped grooves I and are in sliding contact with the drying box body for limiting the bearing plate and making it stable.

[0012] In some embodiments, a rotating shaft is provided at the bottom of the T-shaped plate I. The rotating shaft is rotatably disposed outside the drying box body. One end thereof passes through the inside of the drying box body and extends to the other side. A motor is provided at one end of the rotating shaft for driving the rotating shaft to rotate. Two gears I are provided on the outside of the rotating shaft. The gears I are disposed at the bottom of a rack I. The gears I are meshed with the rack I for driving the bearing plate to enter and exit the inside of the drying box body. A worm is provided at one end of the rotating shaft.

[0013] In some embodiments, a limiting block I is provided inside the working box. A rotating rod I is rotatably disposed inside the limiting block I. The rotating rod I is disposed inside the working box. One end of the rotating rod I passes through one side inside the working box and extends to the other side. The rotating rod I is rotatably connected to the working box. A one-way damping bearing is provided at one end of the rotating rod I. The worm wheel and the rotating rod I are rotatably connected through the one-way damping bearing. A bevel gear I is provided at the other end of the rotating rod I. A rotating rod II is provided outside the bevel gear I. The rotating rod II is rotatably disposed inside the working box. A bevel gear II that cooperates with the bevel gear I is provided on the outside of the rotating rod II.

[0014] In some embodiments, the energy storage component includes an external gear disposed outside the second bevel gear. An external spring spindle is arranged outside the external gear. The external spring spindle is rotatably arranged inside the working box. A spring winding gear for cooperating with the external gear is arranged outside the external spring spindle. An air cylinder support rod II is arranged outside the spring winding gear. The air cylinder support rod II is arranged inside the working box. A controller II is arranged inside the working box to drive the air cylinder support rod II to move. A locking member for cooperating with the spring winding gear is arranged at the top of the air cylinder support rod II. A support seat is arranged at the top of the spring winding gear. The support seat is arranged outside the external spring spindle. A spring box is slidably arranged at the top of the support seat. The spring box is slidably arranged outside the external spring spindle. A spring body is arranged inside the spring box. A conical gear outside the spring box is arranged outside the spring box.

[0015] In some embodiments, the ejecting component includes a third rotating rod. Two second limiting blocks are rotatably arranged outside the third rotating rod. The two second limiting blocks are arranged inside the working box. A third bevel gear for cooperating with the conical gear outside the spring box is arranged at one end of the third rotating rod. A one-way damping bearing is arranged at the other end of the third rotating rod. A second gear is arranged on one side of the third rotating rod. The second gear is rotatably connected to the third rotating rod through the one-way damping bearing. A second rack for cooperating with the second gear is arranged at the bottom of the second gear. A T-shaped plate III is arranged on one side of the second rack. A third T-shaped groove is arranged on one side of the working box. The T-shaped plate III is arranged inside the third T-shaped groove and is in sliding contact with the working box.

[0016] In some embodiments, a positioning block is arranged at the bottom of the second rack. A return spring is arranged on one side of the positioning block. A moving block is arranged at one end of the return spring. The moving block is arranged on one side inside the working box and is in sliding contact with the second rack.

[0017] The utility model has at least the following beneficial effects:

[0018] 1. Through the energy storage component and the ejecting component, when the ceramic is taken out after drying, the staff does not need to enter the drying box to work, which greatly reduces the discomfort or scalding of the staff caused by the too high temperature inside the drying box.

[0019] 2. The dried ceramics do not need to be taken off and placed one by one, which greatly saves the drying time. And when the ceramics are being dried, the next batch of ceramics to be dried can be placed on the material plate in advance, improving the work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the structure of the drying box body of the utility model;

[0022] Figure 3 This is a schematic structural diagram of a rack of the present utility model;

[0023] Figure 4 This is a schematic structural diagram of a material plate of the present utility model;

[0024] Figure 5 This is a schematic structural diagram of a rotating shaft of the present utility model;

[0025] Figure 6 This is a schematic structural diagram of an ejection assembly of the present utility model;

[0026] Figure 7 This is a schematic structural diagram of a power storage assembly of the present utility model;

[0027] Figure 8 This is a schematic structural diagram of a T-shaped plate 1 of the present utility model.

[0028] In the figure: 1, drying box body; 2, ventilation opening; 3, sealing plate; 4, drying box door; 5, T-shaped plate 2; 6, top plate; 7, pneumatic support rod 1; 8, bearing plate; 9, T-shaped plate 1; 10, rack 1; 11, material plate; 12, limiting plate; 13, rotating shaft; 14, gear 1; 15, heating mesh; 16, controller 1; 17, worm; 18, working box; 20, rotating rod 1; 21, limiting block 1; 22, bevel gear 1; 23, bevel gear 2; 24, external gear; 25, rotating rod 2; 26, mainspring winding gear; 27, mainspring central rod; 28, pneumatic support rod 2; 29, locking part; 30, external bevel gear of mainspring box; 31, mainspring box; 32, bevel gear 3; 33, rotating rod 3; 34, limiting block 2; 35, gear 2; 36, rack 2; 37, T-shaped plate 3; 38, moving block; 39, return spring; 40, positioning block; 41, controller 2; 42, mainspring body; 43, support seat. Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] Embodiment 1

[0031] Please refer to Figures 1-7 , the present utility model provides a technical solution:

[0032] A drying device for processing pottery products, including a drying box body 1 and a bearing plate 8 movably arranged inside the drying box body 1, and further including: a working box 18, the working box 18 is arranged outside the bearing plate 8;

[0033] A first rack 10, there are two first racks 10, and the two first racks 10 are respectively arranged on both sides of the bottom of the bearing plate 8;

[0034] A material plate 11, the material plate 11 is arranged on the top of the bearing plate 8;

[0035] An ejection assembly, the ejection assembly is arranged inside the working box 18, and is used to control the second rack 36 to shift and fit the material plate 11, and eject it from the bearing plate 8;

[0036] A power storage assembly, the power storage assembly is arranged inside the working box 18, and is used to store power when the bearing plate 8 moves outwards, and can be released, so as to drive the ejection assembly to work;

[0037] A sealing plate 3 is arranged inside the drying box body 1, the sealing plate 3 is arranged between the drying box body 1 and the bearing plate 8, a drying box door 4 is arranged inside the drying box body 1, T-shaped plates II 5 are arranged on both sides of the drying box door 4, T-shaped grooves II are arranged on both sides inside the drying box body 1, the T-shaped plates II 5 are arranged inside the T-shaped grooves II and are in sliding contact with the drying box body 1, a top plate 6 is arranged on the top of the drying box door 4, pneumatic support rods I 7 are arranged on both sides of the drying box body 1, a controller I 16 is arranged on one side of the drying box body 1, and is used to control the movement of the pneumatic support rods I 7, the tops of the two pneumatic support rods I 7 are respectively arranged at the bottoms of both ends of the top plate 6, and are used to drive the drying box door 4 to lift and lower, a ventilation port 2 is arranged on the top of the drying box body 1, and is used to ensure the air circulation inside the drying box body 1, and heating grids 15 are arranged on multiple sides inside the drying box body 1, and are used to uniformly dry the ceramics inside the drying box body 1;

[0038] Two limiting plates 12 are arranged on the top of the bearing plate 8, and are used to limit the material plate 11. T-shaped plates I 9 are arranged on both sides of the bearing plate 8, T-shaped grooves I are arranged on both sides inside the drying box body 1, and the T-shaped plates I 9 are arranged inside the T-shaped grooves I and are in sliding contact with the drying box body 1, and are used to limit the bearing plate 8 and make it stable;

[0039] A rotating shaft 13 is arranged at the bottom of the T-shaped plate I 9, the rotating shaft 13 is rotatably arranged outside the drying box body 1, one end passes through the inside of the drying box body 1 and extends to the other side, a motor is arranged at one end of the rotating shaft 13, and is used to drive the rotating shaft 13 to rotate. Two gears I 14 are arranged on the outside of the rotating shaft 13, the gears I 14 are arranged at the bottom of the first rack 10, and the gears I 14 are meshed with the first rack 10, and are used to drive the bearing plate 8 to enter and exit the inside of the drying box body 1. A worm 17 is arranged at one end of the rotating shaft 13;

[0040] Inside the working box 18, a first limiting block 21 is provided. Inside the first limiting block 21, a first rotating rod 20 is rotatably provided. The first rotating rod 20 is arranged inside the working box 18. One end of the first rotating rod 20 passes through one side inside the working box 18 and extends to the other side. The first rotating rod 20 is rotatably connected to the working box 18. One end of the first rotating rod 20 is provided with a one-way damping bearing. The worm gear and the first rotating rod 20 are rotatably connected through the one-way damping bearing. The other end of the first rotating rod 20 is provided with a first bevel gear 22. Outside the first bevel gear 22, a second rotating rod 25 is provided. The second rotating rod 25 is rotatably arranged inside the working box 18. Outside the second rotating rod 25, a second bevel gear 23 which is used in cooperation with the first bevel gear 22 is provided.

[0041] The energy storage assembly includes an external gear 24 provided outside the second bevel gear 23. Outside the external gear 24, a mainspring central shaft rod 27 is provided. The mainspring central shaft rod 27 is rotatably arranged inside the working box 18. Outside the mainspring central shaft rod 27, a mainspring winding gear 26 which is used in cooperation with the external gear 24 is provided. Outside the mainspring winding gear 26, a second pneumatic support rod 28 is provided. The second pneumatic support rod 28 is arranged inside the working box 18. Inside the working box 18, a second controller 41 is provided to drive the second pneumatic support rod 28 to move. At the top of the second pneumatic support rod 28, a locking part 29 which is used in cooperation with the mainspring winding gear 26 is provided. At the top of the mainspring winding gear 26, a support seat 43 is provided. The support seat 43 is arranged outside the mainspring central shaft rod 27. On the top of the support seat 43, a mainspring box 31 is slidably arranged. The mainspring box 31 is slidably arranged outside the mainspring central shaft rod 27. Inside the mainspring box 31, a mainspring body 42 is provided. Outside the mainspring box 31, a bevel gear outside the mainspring box 30 is provided.

[0042] The ejection assembly includes a third rotating rod 33. Outside the third rotating rod 33, two second limiting blocks 34 are rotatably provided. The two second limiting blocks 34 are arranged inside the working box 18. One end of the third rotating rod 33 is provided with a third bevel gear 32 which is used in cooperation with the bevel gear outside the mainspring box 30. The other end of the third rotating rod 33 is provided with a one-way damping bearing. On one side of the third rotating rod 33, a second gear 35 is provided. The second gear 35 and the third rotating rod 33 are rotatably connected through the one-way damping bearing. At the bottom of the second gear 35, a second rack 36 which is used in cooperation with the second gear 35 is provided. On one side of the second rack 36, a T-shaped plate three 37 is provided. On one side of the working box 18, a third T-shaped groove is provided. The T-shaped plate three 37 is arranged inside the third T-shaped groove and is in sliding contact with the working box 18.

[0043] In use, the staff starts two pneumatic support rods 7 to raise the drying box door 4 to a certain height, and then starts the motor in the forward direction. The output end of the motor drives the rotating shaft 13 to rotate, thereby driving two first gears 14 to rotate. The rotation of the two first gears 14 drives two first racks 10 engaged therewith to move, so as to drive the carrier plate 8 out of the drying box body 1. When the rotating shaft 13 rotates, it also drives the worm 17 to rotate, and at the same time drives the engaged worm gear to rotate, so that the first bevel gear 22 also rotates. The rotation of the first bevel gear 22 drives the engaged second bevel gear 23 to rotate, and at the same time drives the external gear 24 to rotate. The rotation of the external gear 24 drives the engaged mainspring winding gear 26 to rotate. At this time, the locking member 29 does not move and is at the bottom of the mainspring winding gear 26, so that the mainspring body 42 contracts towards the mainspring shaft 27 for energy storage. At this time, the external bevel gear 30 of the mainspring box and the mainspring box 31 do not move. When the material plate 11 completely appears outside the drying box body 1, the energy storage ends. The controller two 41 is started to make the locking member 29 rise to block the mainspring winding gear 26, and the mainspring body 42 is released, driving the mainspring box 31 to rotate, thereby driving the external bevel gear 30 of the mainspring box to rotate, so that the third bevel gear 32 engaged with the mainspring box 31 rotates, and then the second gear 35 rotates, thereby driving the second rack 36 to move, so as to push out the material plate 11 on the carrier plate 8 to the same horizontal placement table on the other side.

[0044] When drying is required again, the ceramics to be dried are placed on another material plate 11 in advance, and then the material plate 11 is placed on the carrier plate 8. The motor is started in the reverse direction, so that the rotating shaft 13 drives the two first gears 14 to rotate in the reverse direction, and the two first racks 10 engaged with the two first gears 14 drive the carrier plate 8 to move into the drying box body 1. As mentioned above, the worm gear and the first rotating rod 20 are connected by a one-way damping bearing. Therefore, during the movement of the carrier plate 8 into the drying box body 1, the energy storage assembly and the ejection assembly do not move. When the carrier plate 8 completely moves into the drying box body 1, the drying box door 4 is lowered by the pneumatic support rod 7 to close the drying box body 1.

[0045] Embodiment 2

[0046] Please refer to Figure 8 , which is different from Embodiment 1 in that a positioning block 40 is provided at the bottom of the second rack 36, a return spring 39 is provided on one side of the positioning block 40, and a moving block 38 is provided at one end of the return spring 39. The moving block 38 is arranged on one side inside the working box 18 and is in sliding contact with the second rack 36.

[0047] In use, when the second rack 36 completely moves the material plate 11 to the same horizontal placement table on the other side of the bearing plate 8 through the energy storage component and the ejection component, the second rack 36 is reset by the pulling force of the return spring 39. As mentioned above, the second gear 35 and the third rotating rod 33 are connected by a one-way damping bearing, so that during the reset process of the second rack 36, the reverse rotation of the second gear 35 will not cause the third bevel gear 32 to rotate, thus not affecting the previous device.

[0048] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0049] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A drying device for processing pottery products, comprising a drying box body (1) and a bearing plate (8) movably arranged inside the drying box body (1), characterized in that: It further includes: a working box (18) which is arranged outside the bearing plate (8); a first rack (10), there are two first racks (10), and the two first racks (10) are respectively arranged on both sides of the bottom of the bearing plate (8); a material plate (11) which is arranged on the top of the bearing plate (8); a jacking assembly which is arranged inside the working box (18) and is used to control the second rack (36) to shift and fit the material plate (11) and jack it out from the bearing plate (8); a power storage assembly which is arranged inside the working box (18) and is used to store power when the bearing plate (8) moves outwards and can be released to drive the jacking assembly to work.

2. The drying equipment for processing pottery products according to claim 1, wherein: A sealing plate (3) is arranged inside the drying box body (1), the sealing plate (3) is arranged between the drying box body (1) and the bearing plate (8), a drying box door (4) is arranged inside the drying box body (1), T-shaped plates II (5) are arranged on both sides of the drying box door (4), T-shaped grooves II are opened on both sides inside the drying box body (1), the T-shaped plates II (5) are arranged inside the T-shaped grooves II and are in sliding contact with the drying box body (1), a top plate (6) is arranged on the top of the drying box door (4), pneumatic support rods I (7) are arranged on both sides of the drying box body (1), a controller I (16) is arranged on one side of the drying box body (1) and is used to control the movement of the pneumatic support rods I (7), the tops of the two pneumatic support rods I (7) are respectively arranged at both ends of the bottom of the top plate (6) and are used to drive the drying box door (4) to lift and lower, a ventilation port (2) is arranged on the top of the drying box body (1) and is used to ensure the air circulation inside the drying box body (1), and heating nets (15) are arranged on multiple sides inside the drying box body (1) and are used to uniformly dry the ceramics inside the drying box body (1).

3. A drying device for processing pottery products according to claim 2, characterized in that: Two limiting plates (12) are arranged on the top of the bearing plate (8) and are used to limit the material plate (11), T-shaped plates I (9) are arranged on both sides of the bearing plate (8), T-shaped grooves I are arranged on both sides inside the drying box body (1), the T-shaped plates I (9) are arranged inside the T-shaped grooves I and are in sliding contact with the drying box body (1) and are used to limit the bearing plate (8) and make it stable.

4. A drying device for processing ceramic artworks according to claim 3, characterized in that: A rotating shaft (13) is arranged at the bottom of the T-shaped plate I (9), the rotating shaft (13) is rotatably arranged outside the drying box body (1), one end passes through the inside of the drying box body (1) and extends to the other side, a motor is arranged at one end of the rotating shaft (13) and is used to drive the rotating shaft (13) to rotate, two gears I (14) are arranged on the outside of the rotating shaft (13), the gears I (14) are arranged at the bottom of the first rack (10), and the gears I (14) are meshed with the first rack (10) and are used to drive the bearing plate (8) to enter and exit the inside of the drying box body (1), and a worm (17) is arranged at one end of the rotating shaft (13).

5. A drying device for processing ceramic art products according to claim 4, characterized in that: Inside the working box (18), a first limiting block (21) is provided. Inside the first limiting block (21), a first rotating rod (20) is rotatably provided. The first rotating rod (20) is arranged inside the working box (18). One end of the first rotating rod (20) passes through one side inside the working box (18) and extends to the other side. The first rotating rod (20) is rotatably connected to the working box (18). One end of the first rotating rod (20) is provided with a one-way damping bearing, and the worm gear and the first rotating rod (20) are rotatably connected through the one-way damping bearing. The other end of the first rotating rod (20) is provided with a first bevel gear (22). Outside the first bevel gear (22), a second rotating rod (25) is provided. The second rotating rod (25) is rotatably arranged inside the working box (18). Outside the second rotating rod (25), a second bevel gear (23) that cooperates with the first bevel gear (22) is provided.

6. A drying device for processing pottery products according to claim 5, characterized in that: The energy storage assembly includes an external gear (24) arranged outside the second bevel gear (23). Outside the external gear (24), a mainspring central shaft rod (27) is provided. The mainspring central shaft rod (27) is rotatably arranged inside the working box (18). Outside the mainspring central shaft rod (27), a mainspring winding gear (26) that cooperates with the external gear (24) is provided. Outside the mainspring winding gear (26), a second pneumatic support rod (28) is provided. The second pneumatic support rod (28) is arranged inside the working box (18). Inside the working box (18), a second controller (41) is provided to drive the second pneumatic support rod (28) to move. At the top of the second pneumatic support rod (28), a locking member (29) that cooperates with the mainspring winding gear (26) is provided. At the top of the mainspring winding gear (26), a support seat (43) is provided. The support seat (43) is arranged outside the mainspring central shaft rod (27). A mainspring box (31) is slidably arranged on the top of the support seat (43). The mainspring box (31) is slidably arranged outside the mainspring central shaft rod (27). Inside the mainspring box (31), a mainspring body (42) is provided. Outside the mainspring box (31), a bevel gear outside the mainspring box (30) is provided.

7. A drying device for processing pottery products according to claim 6, characterized in that: The ejection assembly includes a third rotating rod (33). Outside the third rotating rod (33), two second limiting blocks (34) are rotatably provided. The two second limiting blocks (34) are arranged inside the working box (18). One end of the third rotating rod (33) is provided with a third bevel gear (32) that cooperates with the bevel gear outside the mainspring box (30). The other end of the third rotating rod (33) is provided with a one-way damping bearing. On one side of the third rotating rod (33), a second gear (35) is provided. The second gear (35) and the third rotating rod (33) are rotatably connected through the one-way damping bearing. At the bottom of the second gear (35), a second rack (36) that cooperates with the second gear (35) is provided. On one side of the second rack (36), a third T-shaped plate (37) is provided. On one side of the working box (18), a third T-shaped groove is provided. The third T-shaped plate (37) is arranged inside the third T-shaped groove and is in sliding contact with the working box (18).

8. A drying device for processing ceramic art products according to claim 7, characterized in that: A positioning block (40) is provided at the bottom of the second rack (36). A return spring (39) is provided on one side of the positioning block (40). One end of the return spring (39) is provided with a moving block (38). The moving block (38) is arranged on one side inside the working box (18) and is in sliding contact with the second rack (36).

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