Rotary cultivator cutter shaft anti-winding mechanism

Abstract

The utility model relates to the technical field of rotary cultivators, and discloses a rotary cultivator cutter shaft anti-winding mechanism which comprises a connecting frame and further comprises two bearing seats which are fixedly installed on the two sides of the inner wall of the connecting frame respectively. Through the arrangement of the installation assembly, a worker can conveniently disassemble and assemble the cutter body, tools such as bolts are not needed, the disassembly and assembly efficiency of the cutter body is effectively improved, the workload of the worker is relieved, through the arrangement of the anti-winding assembly, weeds can be effectively prevented from being wound around the connecting position of the bearing seat and the rotating shaft, and the service life of the cutter body is prolonged. The service life of the bearing seat and the rotating shaft can be effectively prolonged, the situation that the rotating shaft cannot rotate is avoided, the overall practicability of the device is effectively improved, impurities such as soil attached to the outer portion of the cutter body can be effectively cleaned through the arranged cleaning assembly, the sharpness of the cutter body can be effectively improved, and the service life of the cutter body is prolonged. And the overall practicability of the device is further improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to rotary cultivator technical field, concretely relates to a rotary cultivator knife shaft anti -winding mechanism. BACKGROUND

[0002] Rotary cultivator is the tiller that completes ploughing, harrowing operation with tractor, because it has the characteristics such as strong soil breaking capacity, flat ground after ploughing, and has been widely used, can also cut the rootstock buried below the ground surface, facilitate seeding machine operation, provide good seedbed for later seeding, when rotary cultivator is used, need to propose a rotary cultivator knife shaft anti -winding mechanism.

[0003] Traditional rotary cultivator mostly does not have effective anti -winding structure, when rotary cultivator is used, the weeds on the ground can be wound in the outside of bearing seat and rotating shaft, at this time, if the weeds outside bearing seat and rotating shaft are not removed, it will cause weeds to affect the rotation of rotating shaft, also can cause bearing seat and rotating shaft to appear damage etc., thereby can cause the normal use effect of rotary cultivator to be influenced, and, when the traditional rotary cultivator installs the cutter body, generally adopts welding or bolt, although the two ways can effectively fix and install the cutter body, but the process of installation is time -consuming and labor -intensive, not only reduces the dismounting efficiency of cutter body, also increases the work burden of staff, reduces the practicability of device whole.

[0004] Therefore, the rotary cultivator knife shaft anti -winding mechanism is provided by the person skilled in the art to solve the problems in the background art. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a rotary cultivator knife shaft anti -winding mechanism, including connecting frame, still including:

[0006] Two bearing seats are fixedly installed on the inner wall both sides of connecting frame, rotating shaft is rotatably connected between two bearing seats, a plurality of installation frames are fixedly connected on the outside of rotating shaft, installation block is arranged in the inside of a plurality of installation frames, cutter body is fixedly connected on the outside of a plurality of installation blocks;

[0007] Installation assembly is arranged in the inside of installation block;

[0008] Anti -winding assembly is symmetrically arranged on the outside of bearing seat;

[0009] The U-shaped plate is symmetrically arranged on the inside top end of connecting frame;

[0010] Cleaning assembly is arranged between two U-shaped plates.

[0011] As a further improvement of the technical solution, the mounting assembly comprises an inner plate fixedly connected inside the mounting block, the outer wall of the inner plate is symmetrically provided with sliding rods on both sides, the other ends of the plurality of sliding rods are fixedly connected with the inner wall of the mounting block, the inside of the mounting block is symmetrically provided with abutting plates, the inside of the abutting plate is provided with a guide groove for the sliding rod to move, the outside of the sliding rod is sleeved with a return spring, the return spring is abutted between the abutting plate and the inner plate, the outside of the abutting plate is fixedly connected with an arc-shaped clamping block, the inside of the mounting block and the mounting frame is provided with a guide groove for the arc-shaped clamping block to move.

[0012] As a further improvement of the technical solution, the anti-winding assembly comprises a ring-shaped plate symmetrically arranged outside the bearing seat, a plurality of cutting knives are fixedly connected to the outside of the ring-shaped plate, a plurality of plug plates are symmetrically arranged on the outside of the ring-shaped plate, the contact surfaces of the bearing seat and the connecting frame are provided with guide grooves for the plug plates to move, a plurality of fixed frames are fixedly connected to the outer walls of the connecting frame on both sides, the inside of each of the plurality of fixed frames is provided with a guide groove for the plug plate to move, an L-shaped frame is fixedly connected to the outer walls of the connecting frame on both sides, a support plate is fixedly connected to the inside of the L-shaped frame, connecting rods are symmetrically arranged on the upper surface and the lower surface of the support plate, the other ends of the connecting rods are fixedly connected with the inner wall of the L-shaped frame, a moving plate is slidably connected to the outside of each two connecting rods, a return spring is sleeved on the outside of the connecting rod, the two ends of the return spring are fixedly connected with the opposite sides of the moving plate and the L-shaped frame, respectively, a plurality of clamping plates are fixedly connected to the outside of the moving plate, the inside of the fixed frame and the plug plate is provided with a guide groove for the clamping plate to move.

[0013] As a further improvement of the technical solution, the outside of each of the plurality of connecting rods is sleeved with an organ protective cover, and the two ends of each of the plurality of organ protective covers are fixedly connected with the opposite sides of the moving plate and the L-shaped frame, respectively.

[0014] As a further improvement of the technical solution, the cleaning assembly comprises a connecting plate arranged between the two L-shaped plates, and a cleaning brush is fixedly connected to the bottom of the connecting plate.

[0015] As a further improvement of the technical solution, the upper surface of the connecting frame is fixedly connected with a plurality of fixed sleeves, the inside of the fixed sleeve is provided with an abutting disc, the upper surface of the abutting disc is fixedly connected with a pull rod, the outside of the pull rod is sleeved with a connecting spring, the connecting spring is abutted between the abutting disc and the fixed sleeve, the top end of each two pull rods is fixedly connected with a top plate, the bottom of the top plate is fixedly connected with a pressing plate through a bottom plate, the bottom of the pressing plate is symmetrically provided with a plug rod, the contact surfaces of the L-shaped plate and the connecting frame are provided with guide grooves for the plug rod to move, and the inside of the connecting plate is provided with a guide groove for the plug rod to move.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] The rotating tiller shaft anti-winding mechanism, through the installation assembly, the anti-winding assembly and the cleaning assembly, when the rotating tiller runs, the rotating shaft rotates between the two bearing seats, after the rotating shaft rotates for a long time, the weeds on the ground may be wound on the outside of the rotating shaft and the bearing seat, at this time, the anti-winding assembly can effectively cut and scrape the weeds on the outside of the rotating shaft and the bearing seat, thereby avoiding the influence of the weeds on the rotation of the rotating shaft, effectively prolonging the service life of the bearing seat and the rotating shaft, in the process of rotation of the rotating shaft, the cutter body is also driven to rotate synchronously, at this time, the cutter body can be used for tillage processing, in the process of rotation of the cutter body, the cleaning assembly can effectively clean the dirt and other impurities adhered to the outside of the cutter body, thereby avoiding the accumulation of dirt and other impurities on the outside of the cutter body, affecting the tillage effect and efficiency of the cutter body, through the installation of the installation assembly, the cutter body can be conveniently disassembled and assembled by the worker without using bolts and other tools, effectively improving the disassembly and assembly efficiency of the cutter body, reducing the work burden of the worker, and improving the practicability of the device as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is an overall three-dimensional structure schematic view of the utility model;

[0019] Figure 2 It is a three-dimensional structure schematic view of the utility model after the annular plate is disassembled;

[0020] Figure 3 It is a three-dimensional structure schematic view of the utility model after the cleaning brush is disassembled;

[0021] Figure 4 It is a cut three-dimensional structure schematic view of the installation frame and the installation block of the utility model;

[0022] Figure 5 It is a three-dimensional structure schematic view of the annular plate, the cutting knife and the plug-in plate of the utility model;

[0023] Figure 6 It is Figure 2 It is an enlarged structure schematic view of area A in the utility model;

[0024] Figure 7 It is Figure 2 It is an enlarged structure schematic view of area B in the utility model;

[0025] Figure 8 It is Figure 3 It is an enlarged structure schematic view of area C in the utility model;

[0026] Figure 9 It is Figure 4 It is an enlarged structure schematic view of area D in the utility model.

[0027] The meanings of the various reference signs in the figures are as follows:

[0028] 1, connecting frame; 2, bearing seat; 3, rotating shaft; 4, mounting frame; 5, mounting block; 6, cutter body; 7, U-shaped frame; 8, fixed frame; 9, U-shaped plate; 10, connecting plate; 11, cleaning brush; 12, fixed sleeve; 13, annular plate; 14, cutting knife; 15, insertion plate; 16, support plate; 17, connecting rod; 18, moving plate; 19, abutting spring; 20, clamping plate; 21, organ protective cover; 22, pull rod; 23, abutting disc; 24, connecting spring; 25, top plate; 26, bottom plate; 27, pressing plate; 28, insertion rod; 29, inner plate; 30, sliding rod; 31, abutting plate; 32, reset spring; 33, arc-shaped clamping block. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] Please refer to Figure 1 - Figure 9 As shown in the figure, the embodiment provides a rotary cultivator cutter shaft anti-winding mechanism, which comprises a connecting frame 1, and further comprises:

[0031] Two bearing seats 2 are fixedly installed on the inner walls of the connecting frame 1 on both sides, a rotating shaft 3 is rotatably connected between the two bearing seats 2, a plurality of mounting frames 4 are fixedly connected to the outside of the rotating shaft 3, and a mounting block 5 is arranged in each of the mounting frames 4; and a cutter body 6 is fixedly connected to the outside of each of the mounting blocks 5.

[0032] A mounting assembly is arranged in the inside of the mounting block 5.

[0033] An anti-winding assembly is symmetrically arranged on the outside of the bearing seat 2.

[0034] A U-shaped plate 9 is symmetrically arranged on the inside top end of the connecting frame 1.

[0035] A cleaning assembly is arranged between the two U-shaped plates 9.

[0036] The working principle is as follows: during the operation of the rotary cultivator, the rotating shaft 3 rotates between the two bearing seats 2. After the rotating shaft 3 rotates for a long time, the weeds on the ground may wrap around the outside of the rotating shaft 3 and the bearing seat 2. At this time, the anti-winding assembly can effectively cut and scrape the weeds on the outside of the bearing seat 2 and the rotating shaft 3, thereby avoiding the influence of the weeds on the rotation of the rotating shaft 3 and effectively prolonging the service life of the bearing seat 2 and the rotating shaft 3. During the rotation of the rotating shaft 3, the cutter body 6 also rotates synchronously. At this time, the cutting process can be performed by the cutter body 6. During the rotation of the cutter body 6, the cleaning assembly can effectively clean the dirt and other impurities adhered to the outside of the cutter body 6, thereby avoiding the accumulation of dirt and other impurities on the outside of the cutter body 6, which affects the plowing effect and efficiency of the cutter body 6. Through the arrangement of the mounting assembly, the staff can conveniently disassemble and assemble the cutter body 6 without using bolts and other tools, effectively improving the disassembly and assembly efficiency of the cutter body 6, reducing the work burden of the staff, and improving the overall practicality of the device.

[0037] In order to conveniently and effectively fix and install the cutter body 6, the mounting assembly comprises an inner plate 29 fixedly connected inside the mounting block 5. The outer walls of the inner plate 29 are symmetrically provided with sliding rods 30. The other ends of the plurality of sliding rods 30 are fixedly connected with the inner wall of the mounting block 5. The inside of the mounting block 5 is symmetrically provided with a resisting plate 31. The inside of the resisting plate 31 is provided with a guide groove for the sliding movement of the sliding rod 30. The outside of the sliding rod 30 is sleeved with a return spring 32. The return spring 32 abuts between the resisting plate 31 and the inner plate 29. The outside of the resisting plate 31 is fixedly connected with an arc-shaped clamping block 33. The inside of the mounting block 5 and the mounting frame 4 is provided with a guide groove for the sliding movement of the arc-shaped clamping block 33. When it is necessary to fix and install the cutter body 6, the mounting block 5 is first inserted into the inside of the mounting frame 4. At this time, the mounting block 5 drives the arc-shaped clamping block 33 to move synchronously. When the arc-shaped clamping block 33 enters the inside of the mounting frame 4, it is subjected to extrusion. At this time, the arc-shaped clamping block 33 drives the resisting plate 31 to move synchronously outside the sliding rod 30. During the movement of the resisting plate 31, the return spring 32 is extruded. When the mounting block 5 drives the arc-shaped clamping block 33 to move to the guide groove inside the mounting frame 4, the return spring 32 resets, driving the resisting plate 31 and the arc-shaped clamping block 33 to move synchronously. When the arc-shaped clamping block 33 is inserted into the guide groove inside the mounting frame 4, the mounting block 5 and the mounting frame 4 can be fixed. At this time, the cutter body 6 can be fixed and installed without the staff using bolts and other tools, effectively improving the disassembly and assembly efficiency of the cutter body 6, reducing the work burden of the staff, and conveniently disassembling and replacing the cutter body 6, effectively improving the overall practicality of the device.

[0038] In consideration of the fact that the weeds on the ground will wrap around the connecting part of the rotating shaft 3 and the bearing seat 2 after the rotating shaft 3 rotates for a long time, the anti-wrapping assembly comprises annular plates 13 symmetrically arranged outside the bearing seat 2, a plurality of cutting knives 14 fixedly connected to the outer part of the annular plates 13, and plug-in plates 15 symmetrically arranged on the outer part of the annular plates 13. The contact surfaces of the bearing seat 2 and the connecting frame 1 are both provided with guide grooves for the plug-in plates 15 to move in. The outer walls of the connecting frame 1 are both fixedly connected with a plurality of fixed frames 8, and the inner parts of the fixed frames 8 are both provided with guide grooves for the plug-in plates 15 to move in. The outer walls of the connecting frame 1 are both fixedly connected with L-shaped frames 7, and the inner part of each L-shaped frame 7 is fixedly connected with a support plate 16. The upper and lower surfaces of the support plate 16 are both symmetrically provided with connecting rods 17, and the other ends of the connecting rods 17 are fixedly connected with the inner walls of the L-shaped frames 7. The outer parts of every two connecting rods 17 are both slidably connected with moving plates 18, and the outer parts of the connecting rods 17 are both sleeved with abutting springs 19, and the two ends of each abutting spring 19 are respectively fixedly connected with the moving plate 18 and the opposite side of the L-shaped frame 7. The outer part of each moving plate 18 is fixedly connected with a plurality of clamping plates 20, and the inner parts of the fixed frames 8 and the plug-in plates 15 are both provided with guide grooves for the clamping plates 20 to move in. When it is necessary to protect the connecting part between the bearing seat 2 and the rotating shaft 3 from being wrapped, it is only needed to press the moving plates 18 first. At this time, the moving plates 18 will move synchronously on the outer parts of the connecting rods 17. In the process of the moving plates 18 moving, the abutting springs 19 will be stretched, and the moving plates 18 will also drive the clamping plates 20 to move synchronously. At this time, the plug-in plates 15 are inserted into the inner parts of the fixed frames 8, and then the moving plates 18 are released. At this time, the abutting springs 19 are reset, driving the moving plates 18 to move synchronously, and the moving plates 18 drive the clamping plates 20 to move synchronously. When the clamping plates 20 are inserted into the guide grooves in the inner parts of the plug-in plates 15, the plug-in plates 15 and the fixed frames 8 can be fixed. At this time, the annular plates 13 can be fixedly installed, so that the cutting knives 14 can be fixedly installed. In the process of the rotating shaft 3 rotating, part of the weeds will be carried. At this time, the cutting knives 14 can effectively cut and remove the weeds on the connecting part between the rotating shaft 3 and the bearing seat 2, so as to avoid the weeds from wrapping around the connecting part between the rotating shaft 3 and the bearing seat 2, affecting the rotation of the rotating shaft 3, and effectively prolonging the service life of the rotating shaft 3 and the bearing seat 2.

[0039] In order to effectively prolong the service life of the abutting springs 19, the outer parts of the connecting rods 17 are all sleeved with organ protective covers 21, and the two ends of the organ protective covers 21 are respectively fixedly connected with the moving plates 18 and the opposite sides of the L-shaped frames 7. Through the arrangement of the organ protective covers 21, the abutting springs 19 can be effectively protected from dust and water, so as to avoid the abutting springs 19 from rusting and effectively prolong the service life of the abutting springs 19, without affecting the normal use effect of the abutting springs 19.

[0040] In order to effectively clean the dirt and other impurities adhered to the outside of the blade body 6, the cleaning assembly includes a connecting plate 10 arranged between the two shaped plates 9, and the bottom of the connecting plate 10 is fixedly connected with a cleaning brush 11. During the operation of the rotary cultivator, a large amount of dirt and other impurities will adhere to the outside of the blade body 6. If the dirt and other impurities adhered to the outside of the blade body 6 are not cleaned, the sharpness of the blade body 6 will be affected. By arranging the cleaning brush 11, the outside of the blade body 6 can be cleaned during the rotation of the blade body 6, thereby effectively removing the dirt and other impurities adhered to the outside of the blade body 6, and effectively improving the sharpness of the blade body 6, thereby effectively improving the overall cultivation efficiency and effect of the device.

[0041] In addition, in order to facilitate the staff to fix and install the cleaning brush 11, the upper surface of the connecting frame 1 is fixedly connected with a plurality of fixed sleeves 12. The inside of the fixed sleeve 12 is provided with a resisting disc 23, the upper surface of the resisting disc 23 is fixedly connected with a pull rod 22, the outside of the pull rod 22 is sleeved with a connecting spring 24, the connecting spring 24 abuts between the resisting disc 23 and the fixed sleeve 12, the top end of every two pull rods 22 is fixedly connected with a top plate 25, the bottom of the top plate 25 is fixedly connected with a pressing plate 27 through a bottom plate 26, the bottom of the pressing plate 27 is symmetrically provided with an insertion rod 28, the contact surface of the shaped plate 9 and the connecting frame 1 is provided with a guide groove for the insertion rod 28 to move, and the inside of the connecting plate 10 is provided with a guide groove for the insertion rod 28 to move. When it is necessary to fix and install the cleaning brush 11, the top plate 25 is first pulled, at this time the top plate 25 drives the pull rod 22 to move synchronously, the pull rod 22 drives the resisting disc 23 to move synchronously, the resisting disc 23 is extruded during movement, the top plate 25 drives the bottom plate 26 and the pressing plate 27 to move synchronously, the pressing plate 27 drives the insertion rod 28 to move synchronously, at this time the connecting plate 10 is inserted into the inside of the two shaped plates 9, and then the top plate 25 is released, at this time the connecting spring 24 resets, drives the resisting disc 23 and the pull rod 22 to move synchronously, the pull rod 22 drives the top plate 25 to move synchronously, the top plate 25 drives the bottom plate 26 and the pressing plate 27 to move synchronously, the pressing plate 27 drives the insertion rod 28 to move synchronously, when the insertion rod 28 is inserted into the guide groove in the inside of the connecting plate 10, the connecting plate 10 and the shaped plate 9 can be fixed, at this time the cleaning brush 11 can be fixed and installed, and the staff can conveniently disassemble, replace and clean the cleaning brush 11, thereby further improving the practicality of the device as a whole.

[0042] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A rotating cultivator shaft anti-winding mechanism comprising a connecting frame (1), characterized in that, Also includes: Two bearing seats (2) are fixedly installed on the inner wall of the connecting frame (1), and the rotating shaft (3) is rotatably connected between the two bearing seats (2). The outer part of the rotating shaft (3) is fixedly connected with a plurality of mounting frames (4). The inner part of the mounting frame (4) is provided with a mounting block (5). The outer part of the mounting block (5) is fixedly connected with a cutter body (6); The installation assembly is arranged in the inner part of the mounting block (5); The anti-winding assembly is symmetrically arranged on the outer part of the bearing seat (2); The shaped plate (9) is symmetrically arranged on the inner top end of the connecting frame (1); The cleaning assembly is arranged between the two shaped plates (9).

2. A rotating cultivator tine shaft anti-winding mechanism according to claim 1, characterized in that: The installation assembly includes an inner plate (29) fixedly connected to the inner part of the mounting block (5). The outer wall of the inner plate (29) is symmetrically provided with a sliding rod (30) on both sides. The other end of the sliding rod (30) is fixedly connected with the inner wall of the mounting block (5). The inner part of the mounting block (5) is symmetrically provided with a resisting plate (31). The inner part of the resisting plate (31) is provided with a guide groove for the sliding rod (30) to move. The outer part of the sliding rod (30) is sleeved with a reset spring (32). The reset spring (32) is in contact between the resisting plate (31) and the inner plate (29). The outer part of the resisting plate (31) is fixedly connected with an arc-shaped clamping block (33). The inner part of the mounting block (5) and the mounting frame (4) is provided with a guide groove for the arc-shaped clamping block (33) to move.

3. A rotating cultivator tine shaft anti-winding mechanism according to claim 1, characterized in that: The anti-winding assembly includes a ring-shaped plate (13) symmetrically arranged on the outer part of the bearing seat (2). The outer part of the ring-shaped plate (13) is fixedly connected with a plurality of cutting knives (14). The outer part of the ring-shaped plate (13) is symmetrically provided with a plug-in plate (15). The contact surface of the bearing seat (2) and the connecting frame (1) is provided with a guide groove for the plug-in plate (15) to move. The outer wall of the connecting frame (1) is fixedly connected with a plurality of fixed frames (8) on both sides. The inner part of the fixed frame (8) is provided with a guide groove for the plug-in plate (15) to move. The outer wall of the connecting frame (1) is fixedly connected with a shaped frame (7) on both sides. The inner part of the shaped frame (7) is fixedly connected with a supporting plate (16). The upper surface and the lower surface of the supporting plate (16) are symmetrically provided with a connecting rod (17). The other end of the connecting rod (17) is fixedly connected with the inner wall of the shaped frame (7). The outer part of every two connecting rods (17) is slidably connected with a moving plate (18). The outer part of the connecting rod (17) is sleeved with a resisting spring (19). The two ends of the resisting spring (19) are respectively fixedly connected with the moving plate (18) and the opposite side of the shaped frame (7). The outer part of the moving plate (18) is fixedly connected with a plurality of clamping plates (20). The inner part of the fixed frame (8) and the plug-in plate (15) is provided with a guide groove for the clamping plate (20) to move.

4. A rotating cutter shaft anti-winding mechanism according to claim 3, wherein: The outer part of the connecting rod (17) is sleeved with an organ protective cover (21). The two ends of the organ protective cover (21) are respectively fixedly connected with the moving plate (18) and the opposite side of the shaped frame (7).

5. A rotating cutter shaft anti-winding mechanism according to claim 1, wherein: The cleaning assembly comprises a connecting plate (10) arranged between two U-shaped plates (9), and the bottom of the connecting plate (10) is fixedly connected with a cleaning brush (11).

6. A rotating cutter shaft anti-winding mechanism according to claim 5, wherein: The upper surface of the connecting frame (1) is fixedly connected with a plurality of fixed sleeves (12), the inside of the fixed sleeve (12) is provided with a resisting disc (23), the upper surface of the resisting disc (23) is fixedly connected with a pull rod (22), the outside of the pull rod (22) is sleeved with a connecting spring (24), the connecting spring (24) is in abutment between the resisting disc (23) and the fixed sleeve (12), the top end of every two pull rods (22) is fixedly connected with a top plate (25), the bottom of the top plate (25) is fixedly connected with a pressing plate (27) through a bottom plate (26), the bottom of the pressing plate (27) is symmetrically provided with an inserting rod (28), the contact surface of the U-shaped plate (9) and the connecting frame (1) is provided with a guide groove for the movement of the inserting rod (28), and the inside of the connecting plate (10) is provided with a guide groove for the movement of the inserting rod (28).

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