Rapid positioning clamp for liquid floated gyroscope torquer magnetic steel wire cutting

Abstract

The utility model belongs to the field of clamping devices, and particularly relates to a rapid positioning clamp for liquid floated gyro torquer magnetic steel wire cutting, which comprises a block-shaped base, a guide rail seat, a guide rail sliding block, a threaded positioning rod, a positioning block and an external clamping positioning block, and is characterized in that the side surface of the base is provided with a trapezoidal boss; the guide rail base comprises a bottom supporting block, a top T-shaped block and a top abutting block, a trapezoid groove is formed in the side face of the bottom supporting block and matched with the trapezoid boss of the base, the top T-shaped block and the top abutting block are connected to the upper portion of the bottom supporting block, the top T-shaped block is connected with the top abutting block, and the top abutting block is higher than the top T-shaped block. The base and the guide rail seat are positioned through the trapezoidal grooves, positioning is accurate and reliable, the effect of fast reloading inside and outside a machine can be achieved, reloading efficiency is high, a side face clamping mode is adopted for machined parts, and the problem that workblanks warp up due to the fact that the upward pressing portion is too small is solved.

Description

Technical Field

[0001] The utility model belongs to the field of clamping devices, in particular to a quick positioning clamp for magnetic steel wire cutting of a liquid-floating gyro torquer. Background Art

[0002] Ordered hardened deformable permanent magnets made of platinum-cobalt alloys with equal atomic composition have excellent properties such as hydrogen resistance, corrosion resistance, and good magnetic stability. They are mainly used in harsh and special environments where other permanent magnet materials cannot work, such as aerospace, navigation, and military fields. The torquer magnet assembly is the core component for transmitting torque to high-precision gyroscopes. In order to accurately transmit torque to high-precision gyroscopes, permanent magnets are often made of platinum-cobalt permanent magnet alloys with excellent performance, such as Figure 1 As shown. The magnetic steel blank is in the shape of a long strip. Figure 2 As shown, the four plane dimensions are processed by flat grinding, and the two arcs are cut into shape by wire cutting, completing the blanking at the same time. During wire cutting, the blank is suspended on the workbench, one end is pressed with a pressure plate, and the blank is cut after horizontal and axial alignment. The processing has the following disadvantages:

[0003] 1. After the magnetic steel blank is clamped, there is no limit to the position, and it needs to be aligned horizontally and axially at the same time, which results in low alignment efficiency.

[0004] 2. If the pressing length of the magnetic steel blank is too short, the magnetic steel blank will bend up or sag. When aligning, it is necessary to frequently switch between the horizontal and axial directions and make repeated adjustments, which increases the difficulty of alignment in all directions.

[0005] 3. Platinum-cobalt permanent magnet alloy is a precious metal material. When the magnetic steel blank is pressed for a long length, although the difficulty of alignment is appropriately reduced, the residual material increases and the precious metal is seriously wasted.

[0006] 4. Alignment can only be performed on the machine tool workbench, which takes up a long time of cutting and has low equipment utilization. Utility Model Content

[0007] The purpose of the utility model is to overcome the deficiencies of the prior art and to provide a rapid positioning fixture for magnetic steel wire cutting of a liquid-floating gyro torquer used for wire cutting, which can be quickly positioned and clamped.

[0008] The technical solution adopted by the utility model to solve the technical problem is:

[0009] The utility model provides a rapid positioning fixture for magnetic steel wire cutting of a liquid-floating gyro torquer, comprising: a base, a guide rail seat, a guide rail slider, a threaded positioning rod, a positioning block, and an external clamping positioning block, wherein the base is block-shaped, and the side surface of the base is provided with a trapezoidal boss, the trapezoidal boss is provided with a guide rail seat locking threaded hole, and the top surface of the base is provided with a workbench locking threaded hole; the guide rail seat comprises a bottom support block, a top T-block, and a top pressure block, the side surface of the bottom support block is provided with a trapezoidal groove, which is adapted to the trapezoidal boss of the base, the middle of the trapezoidal groove is provided with a guide rail seat through hole, the guide rail seat locking bolt passes through the guide rail seat through hole on the trapezoidal groove, the guide rail seat locking threaded hole on the trapezoidal boss and is locked with the base, and a top T-block and a top pressure block are connected above the bottom support block, the top T-block is connected to the top pressure block, and the top pressure block is higher than The top T-block; the guide rail slider is a rectangular structure, with a T-groove formed along its interior at one end, and the T-groove is adapted to the top T-block of the guide rail seat; one end of the threaded positioning rod is connected to the workpiece to be processed, and the side of the workpiece to be processed is against the top pressing block of the guide rail seat and the guide rail slider; the positioning block is fixed on the top pressing block of the guide rail seat, and a positioning rod threaded hole is formed on the side of the positioning block, and the threaded positioning rod is installed with the positioning rod threaded hole; the off-machine clamping positioning block is an L-shaped block with an upper positioning surface and a lower reference surface, and the distance between the upper positioning surface and the lower reference surface is equal to the distance from the bottom surface of the bottom support block of the guide rail seat to the top surface of the top T-block. Before processing, the guide rail seat assembly formed by the guide rail seat, guide rail slider, threaded positioning rod, and positioning block is placed on the lower reference surface of the off-machine clamping positioning block, and the upper positioning surface of the off-machine clamping positioning block supports and assists in clamping the workpiece to be processed.

[0010] Furthermore, a positioning boss is connected below the base, and the positioning boss is strip-shaped and located at one end away from the trapezoidal boss.

[0011] Furthermore, there are four workbench locking threaded holes on the top surface of the base, distributed at the four corners of the base.

[0012] Furthermore, a positioning block locking threaded hole is formed on the side of the top pressure block, which is located on the side where the trapezoidal groove of the bottom support block is located. A positioning block threaded through hole is formed on the side of the positioning rod threaded hole. The positioning block locking bolt passes through the positioning block threaded through hole on the positioning block, the positioning block locking threaded hole on the top pressure block and is locked with the guide rail seat.

[0013] Furthermore, the top pressure block has two positioning block locking threaded holes, which are distributed side by side up and down; the positioning rod threaded hole also has two positioning block threaded through holes, which are distributed side by side up and down.

[0014] Furthermore, the top surface of the positioning block has a positioning rod locking threaded hole.

[0015] Furthermore, the top pressure block has two guide rail slider locking threaded holes on one side where it connects to the top T-block, and two mounting legs are formed on both sides of the T-groove of the guide rail slider. The two mounting legs are respectively provided with two guide rail slider through holes, and the guide rail slider locking bolts pass through the guide rail slider through holes on the mounting legs and the guide rail slider locking threaded holes on the top pressure block and are locked with the guide rail seat.

[0016] The advantages and positive effects of the utility model are:

[0017] 1. The base and guide rail seat of the utility model adopt trapezoidal groove positioning, which is accurate and reliable, and can achieve fast replacement effect inside and outside the machine, with high replacement efficiency.

[0018] 2. The magnetic steel blank positioning method of the utility model adopts the guide groove formed by the guide rail seat and the guide rail slider to realize the limitation of each degree of freedom in the horizontal plane, achieve the effect of no need for alignment, accurate and reliable positioning, and high clamping efficiency.

[0019] 3. The utility model adopts a side clamping method for the processed parts to solve the problem of the blank warping caused by the upper pressure part being too small.

[0020] 4. The utility model adopts the top pressure block of the guide rail seat and the guide rail slider to axially limit the processed parts (magnetic steel blanks). The threaded positioning rod on the positioning block can ensure that the remaining material size of the processed parts (magnetic steel blanks) at the pressing end is consistent, and the material utilization rate of the processed parts (magnetic steel blanks) is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of a magnetic steel blank in the background technology;

[0022] Figure 2 Schematic diagram of the structure of the magnetic steel blank after processing in the background technology;

[0023] Figure 3 This is a structural diagram of the base of the utility model;

[0024] Figure 4 This is a schematic structural diagram of the guide rail seat of the utility model;

[0025] Figure 5 This is a structural diagram of the guide rail slider of the utility model;

[0026] Figure 6 This is a structural diagram of the threaded positioning rod and positioning block of the utility model;

[0027] Figure 7 This is a structural diagram of the external clamping positioning block of the utility model;

[0028] Figure 8This is a schematic diagram of the overall structure of the quick positioning fixture for magnetic steel wire cutting of the liquid-floating gyro torquer of the present invention;

[0029] Figure 9 This is a schematic diagram of the assembly of the trapezoidal boss of the base and the trapezoidal groove of the guide rail seat in the first perspective;

[0030] Figure 10 This is a schematic diagram of the assembly of the trapezoidal boss of the base and the trapezoidal groove of the guide rail seat from a second viewing angle of the present invention.

[0031] The above drawings include the following reference numerals:

[0032] 1-base; 11-trapezoidal boss; 12-guide rail seat locking threaded hole; 13-workbench locking threaded hole; 14-positioning boss; 2-guide rail seat; 21-bottom support block; 211-trapezoidal groove; 212-guide rail seat through hole; 22-top T-block; 23-top pressure block; 231-guide rail slider locking threaded hole; 232-positioning block locking threaded hole; 3-guide rail slider; 31-T-groove; 32-mounting leg; 33-guide rail slider through hole; 4-threaded positioning rod; 5-positioning block; 51-positioning rod threaded hole; 52-positioning block threaded through hole; 53-positioning rod locking threaded hole; 6-external clamping positioning block; 61-upper positioning surface; 62-lower reference surface; 7-processed part. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0034] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0035] In the description of the present invention, it should be understood that the terms "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0036] like Figure 3-10 As shown, the utility model provides a rapid positioning fixture for liquid-floating gyro torquer magnetic steel wire cutting, comprising: a base 1, a guide rail seat 2, a guide rail slider 3, a threaded positioning rod 4, a positioning block 5, and an external clamping positioning block 6.

[0037] like Figure 3 As shown, the base 1 is block-shaped, and the side of the base 1 has a trapezoidal boss 11, and the trapezoidal boss 11 is formed with a guide rail seat locking threaded hole 12, and the top surface of the base 1 has a workbench locking threaded hole 13. In a specific embodiment, there are four workbench locking threaded holes 13 on the top surface of the base 1, distributed at the four corners of the base 1. In addition, a positioning boss 14 is connected to the bottom of the base 1, and the positioning boss 14 is strip-shaped and located at one end away from the trapezoidal boss 11. The base 1 is used to be connected to the wire cutting workbench, and is positioned with the workbench through the positioning boss 14 below. The four workbench locking threaded holes 13 are locked with the workbench through the workbench locking bolts. The trapezoidal boss 11 on the side of the base 1 can cooperate with the guide rail seat 2 to limit its degree of freedom, achieve the purpose of rapid positioning, and realize the rapid interchange of multiple guide rail seats 2. The guide rail seat locking threaded holes 12 are used to lock the guide rail seat 2.

[0038] like Figure 4As shown, the guide rail seat 2 includes a bottom support block 21, a top T-block 22, and a top pressure block 23. The side of the bottom support block 21 is formed with a trapezoidal groove 211, which is adapted to the trapezoidal boss 11 of the base 1. The middle of the trapezoidal groove 211 has a guide rail seat through hole 212. The guide rail seat locking bolt passes through the guide rail seat through hole 212 on the trapezoidal groove 211 and the guide rail seat locking threaded hole 12 on the trapezoidal boss 11 and is locked with the base 1. A top T-block 22 and a top pressure block 23 are connected above the bottom support block 21. The top T-block 22 is connected to the top pressure block 23, and the top pressure block 23 is higher than the top T-block 22. The trapezoidal groove 211 of the bottom support block 21 on the guide rail seat 2 can cooperate with the base 1 to achieve rapid positioning. The guide rail seat locking bolt is passed through the guide rail seat through hole 212 in the middle of the bottom support block 21 and locked with the trapezoidal boss 11 of the base 1. The top T-block 22 can cooperate with the T-groove 31 in the guide rail slider 3, which limits the degree of freedom while allowing the guide rail slider 3 to slide quickly. The upper end surface of the top T-block 22 can be used to place the workpiece 7 as a workbench for placing the workpiece 7. The side where the top pressing block 23 connects to the top T-block 22 is the positioning surface and clamping surface of the workpiece 7.

[0039] like Figure 5 As shown, the guide rail slider 3 is a rectangular parallelepiped structure with a T-shaped groove 31 formed along its interior at one end. The T-shaped groove 31 is adapted to the top T-shaped block 22 of the guide rail seat 2. In one specific embodiment, the top pressure block 23 has two guide rail slider locking threaded holes 231 on the side where it connects to the top T-shaped block 22. Two mounting legs 32 are formed on both sides of the T-shaped groove 31 of the guide rail slider 3. The two mounting legs 32 are respectively formed with two guide rail slider through holes 33. The guide rail slider locking bolts pass through the guide rail slider through holes 33 on the mounting legs 32 and the guide rail slider locking threaded holes 231 on the top pressure block 23 to lock the guide rail seat 2. The guide rail slider locking threaded holes 231 are used to lock the guide rail slider 3. The locking threads of the small positioning blocks 5, which can be distributed side by side in the upper and lower directions, can fix the positioning blocks 5 to play their positioning role. The guide rail slider 3 is rectangular as a whole, and the internal T-shaped groove 31 can cooperate with the guide rail seat 2. The left and right guide rail slider through holes 33 are used to pass through the guide rail slider locking bolts for locking. Its end face is the part clamping surface, which is mainly used to clamp the processed part 7.

[0040] like Figure 6As shown, one end of the threaded positioning rod 4 is connected to the workpiece 7, and the side of the workpiece 7 is in contact with the top pressure block 23 of the guide rail seat 2 and the guide rail slider 3; the positioning block 5 is fixed to the top pressure block 23 of the guide rail seat 2, and a positioning rod threaded hole 51 is formed on the side of the positioning block 5. The threaded positioning rod 4 is installed with the positioning rod threaded hole 51, and the top surface of the positioning block 5 has a positioning rod locking threaded hole 53. In a specific embodiment, a positioning block locking threaded hole 232 is formed on the side of the top pressure block 23, which is located on the side where the trapezoidal groove 211 of the bottom support block 21 is located. A positioning block threaded through hole 52 is formed on the side of the positioning rod threaded hole 51. The positioning block locking bolt passes through the positioning block threaded through hole 52 on the positioning block 5 and the positioning block locking threaded hole 232 on the top pressure block 23 to lock with the guide rail seat 2. Optionally, the top pressure block 23 has two positioning block locking threaded holes 232, which are arranged side by side in an upper and lower direction; the positioning block threaded through holes 52 of the positioning rod threaded hole 51 also have two positioning block threaded through holes 52, which are arranged side by side in an upper and lower direction. The main function of the positioning block 5 is to maintain the same extension length when multiple clamping different workpieces 7 are clamped, thus playing a role in post-positioning. The two positioning block threaded through holes 52 on the right end are used for fixing to the guide rail seat 2. The threaded positioning rod 4 can be screwed through the positioning rod threaded holes 51 to adjust the extension length of the blank. The positioning block locking threaded hole 232 on the upper end is used to lock the threaded positioning rod 4.

[0041] like Figure 7 As shown, the off-machine clamping positioning block 6 is an L-shaped block with an upper positioning surface 61 and a lower reference surface 62. The distance between the upper positioning surface 61 and the lower reference surface 62 is equal to the distance from the bottom surface of the bottom support block 21 of the guide rail base 2 to the top surface of the top T-shaped block 22. Before machining, the guide rail base assembly formed by the guide rail base 2, the guide rail slider 3, the threaded positioning rod 4, and the positioning block 5 is placed on the lower reference surface 62 of the off-machine clamping positioning block 6. The upper positioning surface 61 of the off-machine clamping positioning block 6 supports and assists in clamping the workpiece 7. When the workpiece 7 is placed on the off-machine clamping positioning block 6 and the top T-shaped block 22 of the guide rail base 2, the two surfaces become coplanar, which is used to limit the horizontal position of the magnetic steel blank during off-machine clamping.

[0042] The utility model adopts positioning with the workbench of the wire cutting equipment, and the fixed clamping device can realize fast clamping.

[0043] The method of using the utility model of the quick positioning fixture for magnetic steel wire cutting of the liquid floating gyro torque device is as follows:

[0044] (1) Position the positioning boss 14 on the base 1 and the workbench, and secure them with the workbench locking bolts through the upper workbench locking threaded holes 13;

[0045] (2) Fix the positioning block 5 and the guide rail seat 2 with the positioning block locking bolt, and screw the threaded positioning rod 4 into the positioning rod threaded hole 51 on the positioning block 5. The extension length can be controlled according to actual needs, and the positioning rod locking threaded hole 53 at the upper end of the positioning block 5 is used to lock it with a bolt to achieve the purpose of rapid positioning;

[0046] (3) The guide rail slider 3 is matched with the top T-block 22 of the guide rail seat 2 through the T-groove 31 inside it, and the relative position of the guide rail slider 3 is adjusted according to the size of the clamping surface of the workpiece 7. After reasonable adjustment, the locking degree of the guide rail slider locking threaded hole 231 can be controlled through the threaded holes on both sides to control the clamping force of the workpiece 7;

[0047] (4) Place the guide rail seat assembly consisting of the guide rail seat 2, the guide rail slider 3, the threaded positioning rod 4, and the positioning block 5 together with the off-machine clamping positioning block 6, with the sides adjacent to each other. Position the workpiece 7 (e.g., a magnetic steel blank) with the upper surface of the off-machine clamping positioning block 6, and place it in the clamping position. Twist the guide rail slider locking bolt to make the guide rail slider 3 contact the side of the magnetic steel blank to form a pre-tightening.

[0048] (5) Twist the threaded positioning rod 4 to slowly extend it, and extend the workpiece 7 (e.g., magnetic steel blank) along the guide rail slider 3 and the inner clamping surface of the top pressure block 23 to an appropriate position. Tighten the guide rail slider locking bolt to install the workpiece 7 (e.g., magnetic steel blank) in a side clamping manner. Figure 8 As shown;

[0049] (6) One end of the trapezoidal groove 211 of the bottom support block 21 on the guide rail seat 2 is matched with the trapezoidal boss 11 of the base 1. After the base 1 and the guide rail seat 2 are positioned and matched through the trapezoidal groove 211, the guide rail seat locking bolt is passed through the guide rail seat through hole 212 in the middle of the bottom support block 21 to fix it to the base 1 installed on the workbench, and then processing is carried out on the machine tool (such as Figure 9 、 Figure 10 As shown), the base 1 and the guide rail seat 2 are positioned by a trapezoidal boss 11 and a trapezoidal groove 211, which can realize the function of aligning outside the machine;

[0050] (7) During processing, steps (4) and (5) can be repeated to install the next blank;

[0051] (8) Repeat steps (4) to (6) for continuous processing.

[0052] The utility model can be used for wire cutting clamping in industries such as aerospace, aviation, shipbuilding, and precision instruments, and has a very broad prospect for promotion and application in the field of large and small batch product processing.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A quick positioning fixture for liquid-floating gyro torquer magnetic steel wire cutting, characterized in that: include: A base (1), the base (1) is block-shaped, the side of the base (1) has a trapezoidal boss (11), the trapezoidal boss (11) is formed with a guide rail seat locking threaded hole (12), and the top surface of the base (1) has a workbench locking threaded hole (13); A guide rail seat (2), the guide rail seat (2) comprising a bottom support block (21), a top T-shaped block (22), and a top pressing block (23); a trapezoidal groove (211) is formed on the side of the bottom support block (21) and is adapted to the trapezoidal boss (11) of the base (1); a guide rail seat through hole (212) is provided in the middle of the trapezoidal groove (211); a guide rail seat locking bolt passes through the guide rail seat through hole (212) on the trapezoidal groove (211) and the guide rail seat locking threaded hole (12) on the trapezoidal boss (11) and is locked with the base (1); a top T-shaped block (22) and a top pressing block (23) are connected above the bottom support block (21); the top T-shaped block (22) is connected to the top pressing block (23); and the top pressing block (23) is higher than the top T-shaped block (22); A guide rail slider (3), the guide rail slider (3) is a rectangular parallelepiped structure, with a T-shaped groove (31) formed along the interior of one end, the T-shaped groove (31) being adapted to the top T-shaped block (22) of the guide rail seat (2); A threaded positioning rod (4), one end of which is connected to the workpiece (7), and the side surface of the workpiece (7) is in contact with the top pressing block (23) of the guide rail seat (2) and the guide rail slider (3); A positioning block (5), wherein the positioning block (5) is fixed on the top pressing block (23) of the guide rail seat (2), a positioning rod threaded hole (51) is formed on the side of the positioning block (5), and the threaded positioning rod (4) is installed with the positioning rod threaded hole (51); An off-machine clamping positioning block (6) is an L-shaped block having an upper positioning surface (61) and a lower reference surface (62). The distance between the upper positioning surface (61) and the lower reference surface (62) is equal to the distance from the bottom surface of the bottom support block (21) of the guide rail seat (2) to the top surface of the top T-shaped block (22). Before processing, a guide rail seat assembly formed by the guide rail seat (2), the guide rail slider (3), the threaded positioning rod (4), and the positioning block (5) is placed on the lower reference surface (62) of the off-machine clamping positioning block (6). The upper positioning surface (61) of the off-machine clamping positioning block (6) supports and assists in clamping the processed part (7).

2. The rapid positioning fixture for magnetic steel wire cutting of liquid-floating gyro torquer according to claim 1, characterized in that: A positioning boss (14) is connected below the base (1), and the positioning boss (14) is strip-shaped and located at one end away from the trapezoidal boss (11).

3. The rapid positioning fixture for magnetic steel wire cutting of liquid-floating gyro torquer according to claim 1, characterized in that: There are four workbench locking threaded holes (13) on the top surface of the base (1), distributed at the four corners of the base (1).

4. The rapid positioning fixture for magnetic steel wire cutting of a liquid-floating gyro torquer according to claim 1, characterized in that: A positioning block locking threaded hole (232) is formed on the side of the top pressure block (23), which is located on the side where the trapezoidal groove (211) of the bottom support block (21) is located. A positioning block threaded through hole (52) is formed on the side of the positioning rod threaded hole (51). The positioning block locking bolt passes through the positioning block threaded through hole (52) on the positioning block (5) and the positioning block locking threaded hole (232) on the top pressure block (23) to be locked with the guide rail seat (2).

5. The rapid positioning fixture for magnetic steel wire cutting of liquid-floating gyro torquer according to claim 1, characterized in that: The top pressing block (23) has two positioning block locking threaded holes (232) that are arranged side by side vertically; the positioning block threaded through holes (52) of the positioning rod threaded hole (51) also have two positioning block threaded through holes (52) that are arranged side by side vertically.

6. The rapid positioning fixture for magnetic steel wire cutting of liquid-floating gyro torquer according to claim 1, characterized in that: The top surface of the positioning block (5) is provided with a positioning rod locking threaded hole (53).

7. The rapid positioning fixture for magnetic steel wire cutting of liquid-floating gyro torquer according to claim 1, characterized in that: The top pressing block (23) is provided with two guide rail slider locking threaded holes (231) on one side where it is connected to the top T-shaped block (22). Two mounting legs (32) are formed on both sides of the T-shaped groove (31) of the guide rail slider (3). Two guide rail slider through holes (33) are respectively formed on the two mounting legs (32). The guide rail slider locking bolt passes through the guide rail slider through holes (33) on the mounting legs (32) and the guide rail slider locking threaded holes (231) on the top pressing block (23) and is locked with the guide rail seat (2).

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