A blade in-mold assembly injection molding apparatus

Abstract

The application relates to the technical field of injection molding equipment, and discloses a vane in-mold assembly injection molding equipment which comprises a switching block, the upper end of the switching block is provided with a top plate, the lower end of the switching block is provided with a bottom plate, two oil cylinders are fixedly arranged on the top plate, the telescopic ends of the two oil cylinders are connected with a fixed plate through connecting pieces, a fixed mold is arranged on the inner side surface of the fixed plate, and a movable mold is arranged around the outer surface of the switching block; the application effectively solves the problem that, when the vane is injected by the in-mold assembly injection molding equipment, the next vane injection can be carried out only after the connecting rod injection and the discharging of the vane are completed, and a lot of time is consumed in the connecting rod injection and discharging process, thereby affecting the vane injection efficiency and making the vane injection production efficiency too low.

Description

Technical Field

[0001] This invention relates to the field of injection molding equipment technology, and in particular to an in-mold assembly injection molding equipment for blades. Background Technology

[0002] In-mold assembly technology refers to the advanced injection molding technology that assembles two or more products within a single injection mold using special methods. This allows a single mold to produce a fully assembled plastic part with movable features, thus eliminating many subsequent assembly processes.

[0003] Cars typically have air conditioning units and air vents installed inside. The air vents have blades and dampers, which are opened and closed by moving a dial left and right. The air vent assembly has numerous parts. Traditionally, parts made of the same material require separate molds for injection molding, followed by manual assembly of the blades and connecting rods. This method is inefficient and prone to damaging the blades.

[0004] Existing methods use in-mold injection molding equipment to assemble blades and connecting rods. First, the blades are injection molded, then the connecting rods are injection molded to connect them. However, during the injection process, after the blades are injection molded, the moving mold and the stationary mold for blade injection separate and open. Then, the mold for connecting rod injection moves inward to contact the blades and perform connecting rod injection. During connecting rod injection, it is necessary to wait for the connecting rod to be injection molded and connected to the blades before the next blade can be injection molded. This process of connecting rod injection and ejection consumes considerable time, impacting blade injection efficiency and resulting in excessively low production efficiency for blade injection molding. Summary of the Invention

[0005] The purpose of this invention is to solve the problem mentioned in the background art that when injecting blades using in-mold assembly injection molding equipment, it is necessary to wait for the connecting rod to be injected and connected to the blade before the next blade can be injected. The process of connecting rod injection and unloading consumes a lot of time, which affects the injection efficiency of blades and makes the blade injection production efficiency too low.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An in-mold injection molding device for blade assembly includes a switching block. The upper end of the switching block is provided with a top plate, and the lower end of the switching block is provided with a bottom plate. Two hydraulic cylinders are fixed on the top plate, and the telescopic ends of the two hydraulic cylinders are connected to a fixed plate through connectors. A fixed mold is installed on the inner surface of the fixed plate, and movable molds are installed around the outer surface of the switching block. The switching block is provided with a discharge mechanism to assist in ejecting the blades of an automobile air vent and a closing mechanism to assist in moving the closing molds on both sides of the movable mold. The bottom plate is provided with a motor that drives the switching block to rotate and switch. The output shaft of the motor is provided with a drive gear set, and the output shaft of the motor is connected to the switching block through the drive gear set.

[0008] Preferably, the lower end face of the base plate is provided with a movable block, the inner surface of the fixed plate is provided with a movable base plate, the end of the movable base plate away from the fixed plate is provided with a limiting plate, the movable base plate is provided with a sliding groove, the movable block is movably disposed in the sliding groove, the upper end of the movable block is connected to the base plate, an auxiliary rod is provided between the fixed plate and the limiting plate, and a movable hole is opened on the top plate, which is movably disposed on the two auxiliary rods through the movable hole, thereby improving the stability of the switching block when moving.

[0009] Preferably, there are multiple discharge mechanisms and closing mechanisms. The switching block is equipped with a guide mechanism and a pushing mechanism that can be used in conjunction with multiple discharge mechanisms. A fixed end extends from the lower end of the base plate and is connected to a helical gear ring. The closing mechanism can be used in conjunction with the helical gear ring. The helical gear on the closing mechanism can contact the helical gear ring during rotation, so that the helical gear can rotate and drive the entire closing mechanism to run. The discharge mechanism can directly eject the injection-molded blade when the switching block rotates.

[0010] Preferably, the closing mechanism includes a first rotating rod, a second rotating rod, and a closing rod. The first rotating rod is provided with a first bevel gear set connected to the second rotating rod. The end of the first rotating rod away from the second bevel gear set is provided with a second bevel gear set connected to the closing rod. Both ends of the outer surface of the closing rod are connected to reciprocating lead screws. Both reciprocating lead screws are provided with reciprocating moving blocks. Both reciprocating moving blocks are provided with closing frame plates. The outer ends of the two closing frame plates are respectively connected to the closing mechanisms on both sides of the moving mold. The reciprocating moving blocks on the reciprocating lead screws can drive the closing frame plates to move back and forth, thereby driving the closing mold on the moving mold to move back and forth.

[0011] Preferably, a helical gear is provided at the upper end of one outer surface of the rotating rod. The rotating rod is rotatably disposed inside the switching block. When the helical gear rotates in a circle with the switching block, it can mesh with the inner teeth of the helical gear ring, so that the helical gear can rotate through meshing with the helical gear ring when it rotates with the switching block.

[0012] Preferably, the guiding mechanism includes a rotating plate, on the upper surface of which multiple guide plates are equidistantly arranged, and each of the multiple guide plates is provided with a guide groove. The rotation of the guide plate can lift the lower push rod upward, and the guide groove facilitates the guide plate to drive the lower push rod upward.

[0013] Preferably, the pushing mechanism includes a pressing rod, a pushing block at the lower end of the pressing rod, and a second spring at the upper end of the pushing block. The elastic force of the second spring is greater than that of the first spring, so that when the second spring pushes the pushing block downward, it can compress the first spring through the moving rod. The second spring is located on the outer surface of the pressing rod. An upper pushing rod is connected to the pushing block. A through hole is opened on the top plate, extending into the switching block. The pressing rod moves within the through hole. A baffle is provided on the pressing rod, located above the top plate.

[0014] Preferably, the discharge machine includes a moving rod, the outer surface of which is provided with a spring, a positioning plate and a pressing plate. The spring is connected to the pressing plate, and the pressing plate is movably mounted on the moving rod. The outer end of the moving rod is provided with a moving plate, and the outer side of the moving plate is provided with multiple ejector rods. Each ejector rod has an ejector head at its outer end. After the ejector head ejects the blade, the spring rebounds, allowing the moving mold to rotate to the next side and drive the moving rod and ejector block to reset.

[0015] Preferably, the switching block has a cavity, and a mechanism cylinder is formed inside the cavity. The mechanism cylinder is connected to the surface of the cavity through multiple connecting ends. The surface of the mechanism cylinder has multiple rotating holes for positioning the rotating rod and extrusion slots for moving multiple moving rods. The rotating rod is rotatably disposed in the rotating hole. The multiple extrusion slots are coaxial with the multiple connecting ends. The outer surface of the switching block has multiple mounting slots for mounting the moving mold at equal intervals. Each of the multiple mounting slots has a moving slot for moving the moving plate. Each of the multiple moving slots has a moving hole that penetrates the multiple extrusion slots.

[0016] Preferably, the switching block is provided with a plurality of moving cavities at equal intervals for moving the closing frame plate. The closing frame plate moves within the moving cavities, and the moving cavities allow the closing frame plate to have room to move, thereby driving the closing molds on both sides of the moving mold to move.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention has a switching block with multiple moving molds. The switching block can be rotated by the battery and the drive gear group to switch the moving molds. After the blade is injection molded, it can be rotated to one side for injection molding and assembly of the connecting rods on both sides without affecting the next moving mold to perform blade injection molding. This effectively improves the blade injection molding efficiency and thus greatly improves the efficiency of blade injection molding production.

[0019] The present invention, through the setting of the closing mechanism, can directly close the closing mold on the other side of the rotating moving mold when the switching block rotates, so that the connecting rod can be directly injected when the moving mold has just rotated to the other side, effectively improving the injection molding efficiency;

[0020] The present invention, through its designed discharge mechanism, can directly eject the blades that have completed the injection molding assembly of the connecting rod from the mold, thereby automatically discharging the blades from the mold without the need for other starting equipment to eject the blades. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a cross-sectional view of the front surface portion of the present invention;

[0024] Figure 3 This is a cross-sectional view of the switching block, top plate, and bottom plate of the present invention;

[0025] Figure 4 This is a structural view of the closing mechanism of the present invention;

[0026] Figure 5 This is a schematic diagram of the pushing mechanism, guiding mechanism, and discharging mechanism of the present invention;

[0027] Figure 6 This is a structural view of the push-down mechanism of the present invention;

[0028] Figure 7 This is a structural view of the guiding mechanism of the present invention;

[0029] Figure 8 This is a structural view of the discharge mechanism of the present invention;

[0030] Figure 9 This is a cross-sectional view of the switching block of the present invention.

[0031] Drawing number descriptions: 1. Switching block; 101. Mechanism cylinder; 102. Connecting end; 13. Extrusion groove; 14. Moving groove; 15. Moving cavity; 16. Rotating hole; 2. Top plate; 3. Fixed plate; 4. Hydraulic cylinder; 5. Moving block; 6. Closing mechanism; 61. Rotating rod one; 62. Bevel gear group one; 63. Helical gear; 64. Helical gear ring; 65. Rotating rod two; 66. Bevel gear group two; 67. Closing rod; 68. Closing frame plate; 7. Discharge mechanism; 71. Moving rod; 72. Extrusion plate; 73. Spring one; 74. Positioning plate; 75. Moving plate; 76. Top rod; 77. Top head; 8. Guide mechanism; 81. Rotating plate; 82. Guide plate; 83. Guide groove; 9. Pushing mechanism; 91. Pressing rod; 92. Push block; 93. Spring two; 94. Upper push rod; 10. Motor; 11. Drive gear group. Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings.

[0033] The following description is intended to disclose the invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0034] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are merely simplified descriptions for the convenience of describing this invention and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this invention.

[0035] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number. Example

[0036] Please refer to Figure 1-3A blade in-mold assembly injection molding equipment includes a switching block 1, a top plate 2 at the upper end of the switching block 1, and a bottom plate at the lower end of the switching block 1. Two hydraulic cylinders 4 are fixed on the top plate 2. The telescopic ends of the two hydraulic cylinders 4 are connected to a fixed plate 3 through connectors. A fixed mold is installed on the inner surface of the fixed plate 3. Moving molds are installed around the outer surface of the switching block 1. The switching block 1 is equipped with a discharge mechanism 7 that assists in ejecting the blades of the car air vent and a closing mechanism 6 that assists in moving the closing molds on both sides of the moving mold. A motor 10 is installed in the bottom plate to drive the switching block 1 to rotate and switch. A drive gear set 11 is provided on the output shaft of the motor 10. The output shaft of the motor 10 is connected to the switching block 1 through the drive gear set 11.

[0037] A movable block 5 is provided on the lower end face of the base plate, and a movable base plate is provided below the inner surface of the fixed plate 3. A limiting plate is provided at the end of the movable base plate away from the fixed plate 3. A sliding groove is provided on the movable base plate, and the movable block 5 is movably disposed in the sliding groove. The upper end of the movable block 5 is connected to the base plate. An auxiliary rod is provided between the fixed plate 3 and the limiting plate. A movable hole is provided on the top plate 2, and the top plate is movably disposed on the two auxiliary rods through the movable hole. The auxiliary rods improve the stability of the switching block 1 when it moves.

[0038] In use, the hydraulic cylinder 4 starts and pulls the switching block 1 to move towards the fixed mold, so that the moving mold facing the fixed mold closes with it, and then the car air vent blades are injected. After the car air vent blades are injected and opened by the hydraulic cylinder 4, the motor 10 starts, and the output shaft of the motor 10 drives the drive gear group 11 to rotate, which in turn drives the lower end of the rotating block to rotate, so that the switching block 1 rotates 90 degrees, and rotates the moving mold on the next side to face the fixed mold, so that the injected car air vent blades are rotated to the other side for the injection of the two connecting parts.

[0039] Please refer to Figure 4 Multiple discharge mechanisms 7 and multiple closing mechanisms 6 are provided. The switching block 1 is equipped with a guide mechanism 8 and a push mechanism 9 that can be used in conjunction with multiple discharge mechanisms 7. A fixed end extends from the bottom of the base plate and is connected to a helical gear ring 64. The closing mechanism 6 can be used in conjunction with the helical gear ring 64. The helical gear 63 on the closing mechanism 6 can contact the helical gear ring 64 during rotation, so that the helical gear 63 can rotate, thereby driving the entire closing mechanism 6 to run. The discharge mechanism 7 can directly eject the injection-molded assembled blade when the switching block 1 rotates.

[0040] The closing mechanism 6 includes a first rotating rod 61, a second rotating rod 65, and a closing rod 67. The first rotating rod 61 is provided with a first bevel gear group 62 connected to the second rotating rod 65. The end of the first rotating rod 61 away from the second bevel gear group 66 is provided with a second bevel gear group 66 connected to the closing rod 67. Both ends of the outer surface of the closing rod 67 are connected to reciprocating lead screws. Both reciprocating lead screws are provided with reciprocating moving blocks 5. Both reciprocating moving blocks 5 are provided with closing frame plates 68. The outer ends of the two closing frame plates 68 are respectively connected to the two closing mechanisms 6 on the moving mold. The reciprocating moving blocks 5 on the reciprocating lead screws can drive the closing frame plates 68 to move back and forth, thereby driving the closing mold on the moving mold to move back and forth.

[0041] A helical gear 63 is provided on the upper end of the outer surface of the rotating rod 61. The rotating rod is rotatably located inside the switching block 1. When the helical gear 63 rotates in a circle with the switching block 1, it can mesh with the inner teeth of the helical gear ring 64. This allows the helical gear 63 to rotate through meshing with the helical gear ring 64 as it rotates with the switching block 1.

[0042] When the moving mold for injection molding the car air vent blades rotates, the helical gear 63 on the closing mechanism 6 connected to it will contact the helical gear ring 64, causing the helical gear 63 to rotate during rotation, which in turn drives the rotating rod 61 to rotate. The rotating rod 61 drives the rotating rod 65 to rotate through the bevel gear group 62. The rotating rod 65 drives the closing rod 67 to rotate through the bevel gear group 66, causing the reciprocating screws at both ends of the closing rod 67 to rotate, causing the reciprocating moving block 5 on the reciprocating screw to move inward. Then, through the connected closing frame plate 68, it pushes the closing molds on both sides of the moving mold for injection molding connecting parts to move, so that the closing molds on both sides can close the mold block for injection molding the car air vent blades, thereby enabling the injection molding of connecting parts. When the moving mold for injection molding the car air vent blades rotates to one side, it can directly close the closing molds on both sides to perform injection molding of connecting parts on both sides.

[0043] When the moving mold that completes the injection molding of the two connecting parts rotates, the helical gear ring 64 continues to cooperate with the helical gear 63, causing the helical gear 63 to continue rotating, which in turn causes the closing rod 67 to rotate. The reciprocating screws at both ends continue to rotate, causing the reciprocating moving block 5 to move outward, so that the two closed molds that have completed the injection molding of the connecting parts open and reset. When the moving mold completes a 90-degree rotation, the moving mold is on one side of the discharge mechanism 7, and the two closed molds are just reset. At this time, the helical gear ring 64 and the helical gear 63 end their cooperation and separate.

[0044] Please refer to Figure 5-9The guide mechanism 8 includes a rotating plate 81, and multiple guide plates 82 are equidistantly arranged on the upper surface of the rotating plate 81. Each guide plate 82 is provided with a guide groove 83. The rotation of the guide plate 82 can lift the lower push rod upward, and the guide groove 83 facilitates the guide plate 82 to drive the lower push rod upward.

[0045] The push mechanism 9 includes a push rod 91, a push block 92 at the lower end of the push rod 91, and a second spring 93 at the upper end of the push block 92. The elastic force of the second spring 93 is greater than that of the first spring 73, so that when the second spring 93 pushes the push block 92 downward, it can squeeze the first spring 73 through the moving rod 71. The second spring 93 is located on the outer surface of the push rod 91. An upper push rod 94 is connected to the push block 92. A through hole is opened on the top plate 2, which extends into the switching block 1. The lower push rod 91 moves within the through hole. A baffle is provided on the lower push rod 91, and the baffle is located above the top plate 2.

[0046] The discharge machine includes a moving rod 71. The outer surface of the moving rod 71 is provided with a spring 73, a positioning plate 74, and a pressing plate 72. The spring 73 is connected to the pressing plate 72. The pressing plate 72 is movably mounted on the moving rod 71. The outer end of the moving rod 71 is provided with a moving plate 75. The outer side of the moving plate 75 is provided with multiple ejector rods 76. The outer ends of the multiple ejector rods 76 are provided with ejector heads 77. After the ejector head 77 ejects the blade, the spring 73 rebounds, so that when the moving mold rotates to the next side, it can drive the moving rod 71 and the ejector block to reset.

[0047] The switching block 1 has a cavity, and a mechanism cylinder 101 is formed inside the cavity. The mechanism cylinder 101 is connected to the surface of the cavity through multiple connecting ends 102. The surface of the mechanism cylinder 101 has multiple rotating holes 16 for positioning the rotating rod 61 and multiple extrusion slots 13 for moving the moving rods 71. The rotating rod 61 is rotatably disposed in the rotating hole 16. The multiple extrusion slots 13 are coaxial with the multiple connecting ends 102 respectively. The outer surface of the switching block 1 has multiple mounting slots for mounting the moving mold at equal intervals. Each of the multiple mounting slots has a moving slot 14 for moving the moving plate 75. Each of the multiple moving slots 14 has a moving hole that penetrates the multiple extrusion slots 13.

[0048] The switching block 1 is provided with multiple moving cavities 15 at equal intervals for moving the closed frame plate 68. The closed frame plate 68 moves within the moving cavities 15. The moving cavities 15 allow the closed frame plate 68 to have room to move, thereby driving the closed molds on both sides of the moving mold to move.

[0049] When the switching block 1 rotates, it drives multiple guide plates 82 to rotate together. The rotating guide plates 82 contact the lower end of the upper push rod 94, causing the lower end of the upper push rod 94 to move upward through the guide groove 83. This, in turn, drives the push block 92 to move upward, and the push block 92 compresses the spring 73, causing the spring 73 to contract. The moving rod 71 on the moving mold, which rotates towards the discharge mechanism 7, will contact the push block 92. When the switching block 1 completes its rotation, the lower push rod just moves out of the guide groove 83 on the guide plate 82, and the spring 73... The rebound then pushes the push block 92 downward, causing the push block 92 to push the moving rod 71 outward. The extrusion plate 72 extrudes the spring 93, and the moving rod 71 pushes the ejector rod 76 outward through the moving plate 75. Then, the ejector head 77 ejects the car air vent blades that have been injected into the moving mold. Thus, when the switching block 1 rotates to switch the moving mold, the corresponding moving mold is ejected, which does not affect the continuous injection molding of the car air vent blades and effectively improves the production efficiency of car air vent blade injection molding.

[0050] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. A blade in-mould assembly injection-moulding apparatus characterised in that: The utility model provides a switching block (1) is equipped with top plate (2) on the upper end, and is equipped with bottom plate on the lower end, and is fixed with two oil cylinders (4) on the top plate (2), and the telescopic end of two oil cylinders (4) is connected with fixed plate (3) through connecting piece, and the inner side surface of fixed plate (3) is equipped with fixed mould, and the outer surface of switching block (1) is equipped with movable mould all around, and the inside of switching block (1) is equipped with the discharging mechanism (7) of auxiliary car air outlet blade and the closing mechanism (6) of auxiliary movable mould two sides closing mould movement, and the bottom plate is equipped with motor (10) that drives switching block (1) to rotate and switch, and the output shaft of motor (10) is equipped with drive gear set (11), and the output shaft of motor (10) is connected with switching block (1) through drive gear set (11); The discharging mechanism (7) and closing mechanism (6) are equipped with multiple, the inside of switching block (1) is equipped with the guiding mechanism (8) and the push-down mechanism (9) that can cooperate with multiple discharging mechanism (7), the bottom plate lower end extends fixed end and is connected with bevel gear (64), and closing mechanism (6) can cooperate with bevel gear (64); The closing mechanism (6) includes rotating rod one (61), rotating rod two (65) and closing rod (67), the rotating rod one (61) is equipped with bevel gear set one (62) connected with rotating rod two (65), and the one end of rotating rod one (61) away from bevel gear set two (66) is equipped with bevel gear set two (66) connected with closing rod (67), and the outer surface of closing rod (67) is connected with reciprocating screw rod at both ends, and the reciprocating screw rod is equipped with reciprocating moving block on both ends, and the reciprocating moving block is equipped with closing frame plate (68) on both ends, and the outer end of closing frame plate (68) is connected with two sides closing mechanism (6) on movable mould respectively; The outer surface of rotating rod one (61) is equipped with bevel gear (63) on the upper end, and rotating rod one (61) and rotating rod two (65) are rotatably arranged in switching block (1).

2. A leaf in-mould assembly injection-moulding apparatus according to claim 1, characterised in that: The bottom plate lower end surface is equipped with moving block (5), the inner side surface of fixed plate (3) is equipped with moving bottom plate below, the one end of moving bottom plate away from fixed plate (3) is equipped with limit board, the moving bottom plate is equipped with sliding slot, the sliding slot is movably equipped with moving block (5), and the upper end of moving block (5) is connected with bottom plate.

3. A leaf in-mold assembly injection molding apparatus according to claim 1, characterized by: The guiding mechanism (8) includes rotating plate (81), and multiple guide plates (82) are equidistantly arranged on the upper surface of rotating plate (81), and the guide plate (82) is equipped with guide groove (83) on both ends.

4. A leaf in-mould assembly injection-moulding apparatus according to claim 3, characterised in that: The push-down mechanism (9) includes push-down rod (91), and the push-down rod (91) is equipped with push block (92) on the lower end, and the push block (92) is equipped with spring two (93) on the upper end.

5. A leaf in-mould assembly injection-moulding apparatus according to claim 4, characterised in that: The discharging machine comprises a moving rod (71), the outer surface of the moving rod (71) is provided with a spring (73), a positioning plate (74) and a pressing plate (72), the spring (73) is connected with the pressing plate (72), the pressing plate (72) is movably arranged on the moving rod (71), the outer end of the moving rod (71) is provided with a moving plate (75), the outer side of the moving plate (75) is provided with a plurality of material pushing rods (76), and the outer end of each of the plurality of material pushing rods (76) is provided with a material pushing head (77).

6. A leaf in-mould assembly injection-moulding apparatus according to claim 5, characterised in that: The switching block (1) is provided with a cavity, and a mechanism cylinder (101) is formed in the cavity.

7. A leaf in-mould assembly injection-moulding apparatus according to claim 6, characterised in that: A plurality of moving cavities (15) for moving the closing frame plate (68) are equidistantly arranged on the switching block (1).

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