CN113970025A

CN113970025A - Four-way to three-way flow pipe joint

Info

Publication number: CN113970025A
Application number: CN202111240607.3A
Authority: CN
Inventors: 张毓中
Original assignee: Zhejiang Hengzhan Machinery Co ltd
Current assignee: Zhejiang Hengzhan Machinery Co ltd
Priority date: 2021-10-25
Filing date: 2021-10-25
Publication date: 2022-01-25
Anticipated expiration: 2041-10-25
Also published as: CN113970025B

Abstract

The invention provides a four-way to three-way flow pipe joint which comprises a first connecting pipe and a second connecting pipe, wherein the first connecting pipe is vertically provided with a connecting pipe sleeved on the second connecting pipe, the connecting pipe is provided with an external threaded pipe, the external threaded pipe is in threaded connection with an internal threaded pipe integrally formed with the second connecting pipe, the first connecting pipe is provided with a mounting strip, the mounting strip is communicated with a through groove for the sliding connection of the second connecting pipe, the mounting strip comprises a first mounting block and a second mounting block, the through groove is provided with a first sliding groove corresponding to the first mounting block, the first sliding groove is connected with a connecting strip in a sliding manner, a first spring is arranged between the first sliding groove and the second sliding groove, the second sliding groove is provided with a second sliding groove corresponding to the second mounting block, the second sliding groove is respectively connected with a second spring, the connecting block is provided with a connecting groove corresponding to the connecting strip, and the second connecting pipe is respectively communicated with the first through hole and the second through hole in a staggered manner. The invention is suitable for three-way pipelines and four-way pipelines, and has the advantage of reducing the production cost of independently producing three-way joints and four-way joints in factories.

Description

Four-way to three-way flow pipe joint

Technical Field

The invention relates to the technical field of hydraulic pipeline connection, in particular to a four-way to three-way flow pipe joint.

Background

At present, chinese patent No. CN204664726U discloses a four-way joint, in which four channel ports of the four-way joint are provided with connecting tubes, each connecting tube includes a large-diameter end connected to the four-way joint and a small-diameter end connected to the large-diameter end, the large-diameter end is sleeved with a chuck, the chuck is provided with a clamping jaw for clamping a hose, an annular space for placing the hose is formed between the clamping jaw and the small-diameter end of the connecting tube, and the chuck is sleeved with a shaft sleeve for contracting the clamping jaw. However, the connector is only suitable for communicating a four-way pipeline, the service performance is single, the connector is not suitable for a three-way pipeline, a factory needs to produce the three-way connector independently, and the production cost is improved.

Disclosure of Invention

In view of this, the present invention provides a four-way to three-way flow pipe joint, which is applicable to three-way pipes and four-way pipes, and reduces the production cost of producing three-way pipes and four-way joints separately in a factory.

In order to solve the technical problems, the technical scheme of the invention is as follows: a four-way variable three-way flow pipe joint comprises a first connecting pipe and a second connecting pipe which is vertically arranged with the first connecting pipe, wherein the first connecting pipe is vertically provided with a connecting pipe sleeved on the second connecting pipe, the connecting pipe is provided with an external thread pipe, the second connecting pipe is integrally formed with an internal thread pipe for threaded connection of the external thread pipe, the side wall of the first connecting pipe, far away from the connecting pipe, is provided with a mounting strip, the mounting strip is communicated with a through groove for sliding connection of the second connecting pipe, the mounting strip comprises a first mounting block and a second mounting block, a first sliding groove is formed at the position, corresponding to the first mounting block, of the through groove, the first sliding groove is connected with a connecting strip in a sliding manner, a first spring is arranged between the first sliding groove and the connecting strip, a second sliding groove is formed at the position, corresponding to the second mounting block, the second sliding groove is connected with a connecting block in a sliding manner, and a second spring is arranged between the second sliding groove and the connecting block, the connecting block is provided with a connecting groove for the sliding connection of the connecting strip, the connecting pipe II is provided with two first through holes communicated with the connecting pipe I in a penetrating manner, and the side wall of the connecting pipe II corresponding to the mounting strip is provided with two second through holes in a penetrating manner.

Through the technical scheme, the external threaded pipe is screwed into or out of the internal threaded pipe through the threaded connection of the external threaded pipe and the internal threaded pipe, the positions of the first connecting pipe and the second connecting pipe are adjusted, and the connecting positions of the first connecting pipe and the second connecting pipe are fixed. When the external threaded pipe is completely screwed into the internal threaded pipe, the two first through holes are communicated with the first connecting pipe, the two second through holes are abutted against the inner groove wall of the through groove, the two second through holes are both in a closed state, and the pipe joint is in a four-way state. When the external thread pipe revolves away from the internal thread pipe, take over two and remove to keeping away from connecting pipe one side in logical groove and connecting pipe internal rotation, thereby make take over two one end that is close to the internal thread pipe and take over the interval crescent of one, when the opening of spout one and spout two all exposes in taking over two outsides, under the spring action of spring one, the connecting strip slides to one side that is close to the spread groove along the interior cell wall of spout one, under the spring action of spring two, the connecting block slides along the one side that the interior cell wall of spout two is close to the connecting strip, the connecting strip laminates with the interior cell wall of spread groove, be close to sliding to connecting block one side, the connecting strip all contradicts with taking over two with the connecting block, be used for closing the opening of taking over two one end that is close to the mounting bar. At the moment, the two through holes II are communicated with the first connecting pipe, the two through holes I are abutted against the inner pipe wall of the connecting pipe, the two through holes I are both in a closed state, and the pipe joint is converted into a tee joint from a four-way joint. The pipe joint adopts a threaded connection mode to control the conversion of the four-way joint and the three-way joint, has better sealing performance, more convenient conversion process and better applicability, can be applied to both a three-way pipe and a four-way pipe, and reduces the production cost compared with the independent production of the four-way joint and the three-way joint.

Preferably, the inner hole walls of the two through holes are adhered with sealing plates, and the two sealing plates are attached to the inner groove wall of the through groove.

Through above-mentioned technical scheme, when the takeover two to keep away from one side rotary motion of connecting pipe, two closing plates are inconsistent with connecting strip and connecting block respectively, avoid causing because of the rotation of connecting strip or connecting block to the external screw pipe in inserting through-hole two and interfere, and then guarantee that connecting strip and connecting block stretch out spout one and spout two with correct position distribution. Because the sealing plate is fixed with the inner hole wall of the second through hole in a bonding mode, when the second through hole is communicated with the first connecting pipe, a worker can stretch into the inner cavity of the first connecting pipe through the stick-shaped object to push the sealing plate away from the pipe joint, and therefore the first connecting pipe is communicated with the second connecting pipe.

Preferably, the outer wall of the second connecting pipe is provided with a limiting groove corresponding to the position of the external threaded pipe, and the external threaded pipe is provided with a limiting ring which is connected with the limiting groove in a sliding manner.

Through the technical scheme, the limiting groove and the limiting ring are used for limiting the screwing-in or screwing-out between the external threaded pipe and the internal threaded pipe, the external threaded pipe is prevented from being separated from the internal threaded pipe in the screwing-out process, and therefore the connection of the first connecting pipe and the second connecting pipe is guaranteed. When the pipe joint is converted into a tee joint from a cross joint, the inner groove wall of the limiting groove far away from the inner threaded pipe is abutted to the limiting ring, so that the outer threaded pipe is prevented from continuously rotating away from the inner threaded pipe, and the connecting strip is matched with the connecting block to abut against the second connecting pipe, so that the threaded connection between the outer threaded pipe and the inner threaded pipe is locked.

Preferably, the first sliding groove is provided with a first positioning groove, and the connecting strip is provided with a first positioning block connected with the first positioning groove in a sliding manner.

Through the technical scheme, the first positioning groove and the first positioning block have two purposes of limiting the sliding of the connecting strip, so that the connecting strip is prevented from being separated from the first sliding groove, and when the pipe joint is in a three-way state, the inner groove wall of the first positioning groove, which is close to the opening of the first sliding groove, is abutted to the first positioning block, so that the connecting strip is positioned.

Preferably, the second sliding groove is provided with a second positioning groove, and the connecting block is provided with a second positioning block which is connected with the second positioning groove in a sliding manner.

Through the technical scheme, the second positioning groove and the positioning block can slide along the limiting connecting block, the connecting block is prevented from being separated from the second sliding groove, and when the pipe joint is in a three-way state, the inner groove wall of the second positioning groove, which is close to the opening of the second sliding groove, is abutted against the second positioning block, so that the positioning effect on the connecting block is achieved.

Preferably, a flow pipe is arranged on the inner groove wall at the bottom of the connecting groove, the connecting block is provided with an observation pipe communicated with the flow pipe, and a counterweight ball is connected in the observation pipe in a sliding manner.

Through the technical scheme, when the pipe joint is in a three-way state, a gap communicated with the flow pipe is reserved between the connecting strip and the inner groove wall of the bottom surface of the connecting groove, when the pipe joint in the three-way state is in use, if the hydraulic pressure of the inner cavities of the two connecting pipes is too large, liquid in the inner cavities of the two connecting pipes is squeezed into the flow pipe through the gap, the liquid overcomes the gravity action of the counterweight balls and is squeezed into the observation pipe, and the hydraulic pressure of the inner cavities of the two connecting pipes is reduced to a certain extent. When the hydraulic pressure of the inner cavity of the second connecting pipe returns to normal, the counterweight ball is used for destroying the tension of the liquid in the observation pipe, so that the liquid loses the force attached to the inner pipe wall of the observation pipe, and the liquid can smoothly flow back to the inner cavity of the second connecting pipe.

Preferably, the diameter of the counterweight ball is larger than the diameter of the inner pipe of the flow pipe.

Through above-mentioned technical scheme, the diameter of counter weight ball is greater than the inner tube diameter of flow tube, avoids counter weight ball to break away from the observation pipe.

Preferably, the connecting block is provided with an observation window far away from the side wall of the connecting groove, and the observation window extends along the length direction of the observation tube.

Through the technical scheme, the observation window is made of the high-strength glass material, so that the working personnel can observe the liquid level position in the observation pipe conveniently, and the hydraulic condition in the pipe joint in the three-way state can be judged.

Preferably, a clamping groove is formed in the side wall, close to the first sliding groove, of the first mounting block, and a clamping block inserted into the clamping groove is arranged on the connecting block.

Through above-mentioned technical scheme, fixture block and draw-in groove are used for the position of location connecting block on the interior cell wall that leads to the groove, keep connecting groove and taking over two pairs of connecting strips support tightly, thereby avoid connecting block or connecting strip to rock because of external force and influence liquid inflow or outflow flow tube.

Preferably, the end of the latch (30) inserted into the slot (29) is provided with a guide surface (31) which is arranged in a curved manner, and the guide surface (31) is attached to an inner groove wall of the slot (29).

Through above-mentioned technical scheme, when the fixture block was close to the draw-in groove, the guide face was inconsistent with the interior cell wall of draw-in groove opening part for guide fixture block inserts in the draw-in groove.

Drawings

FIG. 1 is a first cross-sectional view of an embodiment;

FIG. 2 is an enlarged view of area A of FIG. 1;

FIG. 3 is a second cross-sectional view of the embodiment.

Reference numerals: 1. taking over a first pipe; 2. a second connecting pipe; 3. a connecting pipe; 4. an externally threaded tube; 5. an internally threaded tube; 6. mounting a bar; 61. a first mounting block; 62. a second mounting block; 7. a through groove; 8. a first sliding chute; 9. a second chute; 10. a connecting strip; 11. connecting blocks; 12. a first spring; 13. a second spring; 14. a first telescopic rod; 15. a second telescopic rod; 16. connecting grooves; 17. a first through hole; 18. a second through hole; 19. a sealing plate; 20. a limiting groove; 21. a limiting ring; 22. positioning a first groove; 23. a first positioning block; 24. positioning a second groove; 25. a second positioning block; 26. a flow tube; 27. an observation tube; 28. a counterweight ball; 29. a card slot; 30. a clamping block; 31. a guide surface; 32. and (4) an observation window.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in order to make the technical solution of the present invention easier to understand and understand.

Referring to fig. 1, 2 and 3, a four-way to three-way flow pipe 26 joint comprises a first connection pipe 1 and a second connection pipe 2 vertically arranged with the first connection pipe 1, wherein the first connection pipe 1 is vertically provided with a connection pipe 3 sleeved on the second connection pipe 2, the connection pipe 3 is provided with an external threaded pipe 4, the second connection pipe 2 is integrally formed with an internal threaded pipe 5 for the external threaded pipe 4 to be in threaded connection, the external threaded pipe 4 is screwed into or out of the internal threaded pipe 5 through the threaded connection of the external threaded pipe 4 and the internal threaded pipe 5, so that the positions of the first connection pipe 1 and the second connection pipe 2 are adjusted and the connection positions of the two are fixed, and the applicability of the joint is improved. The outer wall of the second connecting pipe 2 is provided with a limiting groove 20 corresponding to the position of the outer threaded pipe 4, the outer threaded pipe 4 is provided with a limiting ring 21 connected to the limiting groove 20 in a sliding mode, the limiting ring is used for limiting screwing-in or screwing-out between the outer threaded pipe 4 and the inner threaded pipe 5, the outer threaded pipe 4 is prevented from being separated from the inner threaded pipe 5 in the screwing-out process, and therefore connection of the first connecting pipe 1 and the second connecting pipe 2 is guaranteed. The side wall of the first connecting pipe 1 far away from the connecting pipe 3 is provided with a mounting strip 6, the mounting strip 6 is provided with a through groove 7 for the sliding connection of the second connecting pipe 2, and the mounting strip 6 comprises a first mounting block 61 and a second mounting block 62. The inner groove wall of the limiting groove 20 away from the internal thread pipe 5 is abutted against the limiting ring 21, so that the external thread pipe 4 is prevented from continuously rotating away from the internal thread pipe 5.

The through groove 7 is provided with a first sliding groove 8 corresponding to the first mounting block 61, and the first sliding groove 8 is connected with a connecting strip 10 in a sliding manner. The first sliding groove 8 is provided with a first positioning groove 22, and the connecting strip 10 is provided with a first positioning block 23 connected with the first positioning groove 22 in a sliding manner so as to limit the sliding of the connecting strip 10 and prevent the connecting strip 10 from being separated from the first sliding groove 8. A first spring 12 is arranged between the first sliding groove 8 and the connecting strip 10, and a first telescopic rod 14 for sleeving the first spring 12 is arranged between the first sliding groove 8 and the connecting strip 10 and used for guiding the telescopic direction of the first spring 12.

The through groove 7 is provided with a second sliding groove 9 corresponding to the second mounting block 62, the second sliding groove 9 is connected with a connecting block 11 in a sliding manner, the second sliding groove 9 is provided with a second positioning groove 24, and the connecting block 11 is provided with a second positioning block 25 connected with the second positioning groove 24 in a sliding manner and used for limiting the sliding of the connecting block 11 and preventing the connecting block 11 from being separated from the second sliding groove 9. A second spring 13 is arranged between the second sliding groove 9 and the connecting block 11, and a second expansion link 15 for sleeving the second spring 13 is arranged between the second sliding groove 9 and the connecting strip 10 to guide the expansion direction of the second spring 13.

The connecting block 11 is provided with a connecting groove 16 for the sliding connection of the connecting strip 10, the connecting pipe II 2 is penetrated with two through holes I17 communicated with the connecting pipe I1, and the side wall of the connecting pipe II 2 corresponding to the mounting strip 6 is penetrated with two through holes II 18. And sealing plates 19 are adhered to the inner hole walls of the two through holes 18, and the two sealing plates 19 are attached to the inner groove walls of the through grooves 7. The sealing tube is used for avoiding interference caused by the rotation of the external thread tube 4 when the connecting strip 10 or the connecting block 11 is inserted into the second through hole 18, and further ensuring that the connecting strip 10 and the connecting block 11 extend out of the first sliding groove 8 and the second sliding groove 9 in a correct position distribution mode. Because the sealing plate 19 is fixed with the inner hole wall of the second through hole 18 in a bonding manner, when the second through hole 18 is communicated with the first connecting pipe 1, a worker can extend into the inner cavity of the first connecting pipe 1 through the stick-shaped object to push the sealing plate 19 away from the pipe joint, so that the first connecting pipe 1 is communicated with the second connecting pipe 2.

When the external thread pipe 4 is completely screwed into the internal thread pipe 5, the two first through holes 17 are communicated with the first connecting pipe 1, the two second through holes 18 are abutted against the inner groove wall of the through groove 7, the two second through holes 18 are in a closed state, and the pipe joint is in a four-way state. When the external threaded pipe 4 is screwed off the internal threaded pipe 5, the connecting pipe two 2 rotates in the through groove 7 and the connecting pipe 3 and moves towards one side far away from the connecting pipe 3, so that the distance between one end, close to the internal threaded pipe 5, of the connecting pipe two 2 and the connecting pipe one 1 is gradually increased, until the openings of the sliding groove one 8 and the sliding groove two 9 are exposed outside the connecting pipe two 2, under the elastic action of the spring one 12, the connecting strip 10 slides towards one side close to the connecting groove 16 along the inner groove wall of the sliding groove one 8, under the elastic action of the spring two 13, the connecting block 11 slides towards one side, close to the connecting strip 10, of the inner groove wall of the sliding groove two 9, the connecting strip 10 is attached to the inner groove wall of the connecting groove 16 and slides towards one side of the connecting block 11, and both the connecting strip 10 and the connecting block 11 are in contact with the connecting pipe two 2 to close the opening at one end, close to the mounting strip 6, of the connecting pipe two 2. At the moment, the two through holes I18 are communicated with the connecting pipe I1, the two through holes I17 are abutted to the inner wall of the connecting pipe 3, the two through holes I17 are in a closed state, the pipe joint is converted into a tee joint from a cross joint, the inner groove wall, close to the opening of the sliding groove I8, of the positioning groove I22 is abutted to the positioning block I23 to play a positioning role on the connecting strip 10, and the inner groove wall, close to the opening of the sliding groove II 9, of the positioning groove II 24 is abutted to the positioning block II 25 to play a positioning role on the connecting block 11. The abutting engagement of the limiting groove 20 and the limiting ring 21 connects the bar 10 and the connecting block 11, thereby locking the threaded connection of the externally threaded tube 4 and the internally threaded tube 5.

The pipe joint adopts a threaded connection mode to control the conversion of the four-way joint and the three-way joint, has better sealing performance, more convenient conversion process and better applicability, can be applied to both a three-way pipe and a four-way pipe, and reduces the production cost compared with the independent production of the four-way joint and the three-way joint.

The bottom inner groove wall of the connecting groove 16 is provided with a flow pipe 26, the connecting block 11 is provided with an observation pipe 27 communicated with the flow pipe 26, and the observation pipe 27 is connected with a counterweight ball 28 in a sliding way. The diameter of the weighted ball 28 is larger than the inner tube diameter of the flow tube 26 to prevent the weighted ball 28 from leaving the sight tube 27. When the pipe joint is in a three-way state, a gap communicated with the flow pipe 26 is reserved between the connecting strip 10 and the inner wall of the bottom surface of the connecting groove 16, when the pipe joint in the three-way state is in use, if the hydraulic pressure of the inner cavity of the connecting pipe II 2 is too high, liquid in the inner cavity of the connecting pipe II 2 is squeezed into the flow pipe 26 through the gap, the liquid is squeezed into the observation pipe 27 under the action of gravity of the counterweight ball 28, and the hydraulic pressure of the inner cavity of the connecting pipe II 2 is reduced to a certain extent. When the hydraulic pressure in the inner cavity of the connection pipe two 2 returns to normal, the counterweight ball 28 is used for breaking the tension of the liquid in the observation pipe 27, so that the liquid loses the force attached to the inner wall of the observation pipe 27, and the liquid can smoothly flow back to the inner cavity of the connection pipe two 2.

The side wall of the connecting block 11 far away from the connecting groove 16 is provided with an observation window 32 made of high-strength glass material, the observation window 32 extends along the length direction of the observation tube 27, so that the staff can observe the liquid level position in the observation tube 27 conveniently, and the hydraulic condition in the pipe joint in the three-way state can be judged. The side wall of the first mounting block 61 close to the first sliding groove 8 is provided with a clamping groove 29, the connecting block 11 is provided with a clamping block 30 inserted in the clamping groove 29 to position the connecting block 11 on the inner groove wall of the through groove 7, the connecting groove 16 and the second connecting pipe 2 are kept abutting against the connecting strip 10, and the situation that the connecting block 11 or the connecting strip 10 shakes due to external force to influence the liquid flowing into or flowing out of the flow pipe 26 is avoided. The end of the latch 30 inserted into the latch groove 29 is provided with a guide surface 31 which is curved, and the guide surface 31 is attached to the inner groove wall of the latch groove 29. When the latch 30 approaches the latch groove 29, the guide surface 31 abuts against an inner groove wall at the opening of the latch groove 29 to guide the latch 30 to be inserted into the latch groove 29.

The above are only typical examples of the present invention, and besides, the present invention may have other embodiments, and all the technical solutions formed by equivalent substitutions or equivalent changes are within the scope of the present invention as claimed.

Claims

1. The utility model provides a four-way becomes tee bend flow tube (26) and connects, includes take over one (1) and with take over two (2) that take over one (1) perpendicular setting, characterized by: the connecting pipe (3) sleeved with the connecting pipe two (2) is vertically arranged on the connecting pipe one (1), the connecting pipe (3) is provided with an external threaded pipe (4), the connecting pipe two (2) is integrally formed with an internal threaded pipe (5) for the external threaded pipe (4) to be connected in a threaded manner, the side wall of the connecting pipe (3) far away from the connecting pipe one (1) is provided with a mounting strip (6), a through groove (7) for the connecting pipe two (2) to be connected in a sliding manner is arranged in the mounting strip (6), the mounting strip (6) comprises a mounting block one (61) and a mounting block two (62), a sliding groove one (8) is arranged at the position of the through groove (7) corresponding to the mounting block one (61), the connecting strip (10) is connected in a sliding manner by the sliding groove one (8), a spring one (12) is arranged between the sliding groove one (8) and the connecting strip (10), and a sliding groove two (9) is arranged at the position of the through groove (7) corresponding to the mounting block two (62), the utility model discloses a fixing device for fixing a mounting plate, including connecting piece (11), connecting piece (11) are connected with sliding of two spout (9), two spout (9) with be provided with spring two (13) between connecting piece (11), the confession has been seted up in connecting piece (11) connecting groove (16) that connecting strip (10) slided and connect, take over two (2) link up have two with take over one (1) communicating through-hole one (17), take over two (2) correspond the lateral wall of mounting strip (6) department link up and have two through-holes two (18).

2. The four-way to three-way flow tube (26) fitting of claim 1, wherein: and sealing plates (19) are adhered to the inner hole walls of the two second through holes (18), and the two sealing plates (19) are attached to the inner groove walls of the through grooves (7).

3. The four-way to three-way flow tube (26) fitting of claim 1, wherein: the outer wall of the second connecting pipe (2) corresponds to the position of the external threaded pipe (4) and is provided with a limiting groove (20), and the external threaded pipe (4) is provided with a limiting ring (21) which is connected with the limiting groove (20) in a sliding manner.

4. The four-way to three-way flow tube (26) fitting of claim 1, wherein: the first sliding groove (8) is provided with a first positioning groove (22), and the connecting strip (10) is provided with a first positioning block (23) which is connected with the first positioning groove (22) in a sliding mode.

5. The four-way to three-way flow tube (26) fitting of claim 4, wherein: and a second positioning groove (24) is formed in the second sliding groove (9), and a second positioning block (25) connected with the second positioning groove (24) in a sliding manner is arranged on the connecting block (11).

6. The four-way to three-way flow tube (26) fitting of claim 5, wherein: a flow pipe (26) is arranged on the bottom inner groove wall of the connecting groove (16), an observation pipe (27) communicated with the flow pipe (26) is arranged on the connecting block (11), and a counterweight ball (28) is connected in the observation pipe (27) in a sliding manner.

7. The four-way to three-way flow tube (26) fitting of claim 6, wherein: the diameter of the counterweight ball (28) is larger than the inner tube diameter of the flow tube (26).

8. The four-way to three-way flow tube (26) fitting of claim 6, wherein: the connecting block (11) is far away from the side wall of the connecting groove (16) and is provided with an observation window (32), and the observation window (32) extends along the length direction of the observation pipe (27).

9. The four-way to three-way flow tube (26) fitting of claim 8, wherein: a clamping groove (29) is formed in the side wall, close to the sliding groove I (8), of the mounting block I (61), and a clamping block (30) inserted into the clamping groove (29) is arranged on the connecting block (11).

10. The four-way to three-way flow tube (26) fitting of claim 9, wherein: the end part of the clamping block (30) inserted into the clamping groove (29) is provided with a guide surface (31) which is arranged in a bending way, and the guide surface (31) is attached to the inner groove wall of the clamping groove (29).