Straight gear forging forming device

Abstract

The invention belongs to the technical field of metal part machining and manufacturing, and discloses a straight gear forging forming device which comprises hydraulic equipment. Through cooperation of a first correcting assembly, a supporting assembly and other structures, all guide rods are pushed to move outwards through a guide assembly, the guide rods drive the lower ends of bidirectional telescopic rods to move, and therefore the straight gear is forged and formed. The upper ends of the supporting plates push the first spring telescopic rods to move, the telescopic ends of the first spring telescopic rods abut against the edge of the metal raw material, the first spring telescopic rods abut against the edge of the metal raw material at the same time, and therefore the center point of the metal raw material and the center point of the mold can be located on the same axis. And according to the track, the telescopic end of the spring telescopic rod can drive the pressing plate to extrude the top of the metal raw material, so that the pressing plate is better attached to the top of the die, and the strength of the forged gear is further enhanced while the qualified rate of the strength of the gear is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal parts processing and manufacturing, in particular to a spur gear forging device. Background Art

[0002] Gears are a kind of parts used for power transmission. In the machinery manufacturing industry, they are generally made of metal forging to enhance the strength and wear resistance of the gears. In the manufacturing process, they are also divided into open die forging and closed die forging. Regardless of the forging method, the center point of the heated metal raw material and the center point of the die need to be on the same axis, so that when the forging equipment pressurizes the metal raw material, its forging deformation and internal stress are within a reasonable range;

[0003] However, factories usually place metal raw materials manually. Due to the heavy weight of the raw materials, workers cannot ensure that the positions of the metal raw materials and the molds coincide with each other, which may cause the strength of the gears to fail to meet the standards after the forging equipment is pressurized. For this reason, we provide a spur gear forging device. Summary of the invention

[0004] In order to solve the problems raised in the above-mentioned background technology, the present invention provides a spur gear forging device, which solves the problem that the overall weight of the metal raw material is too large, and when workers place the raw material, they cannot ensure that its position coincides with the mold, which may cause the strength of the gear after forging to be substandard.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a spur gear forging device, comprising a hydraulic device and a base;

[0006] Rotating a guide assembly mounted inside the base;

[0007] A mold fixed on the top of the base;

[0008] Four support components arranged on the periphery of the mold;

[0009] The support assembly includes a second spring telescopic rod arranged outside the mold, a support plate is elastically connected to the second spring telescopic rod, and a first spring sheet is installed on the top of the support plate;

[0010] The spur gear forging device also includes a support frame 2 installed on the top of the base;

[0011] Two correction components 2 are arranged at equal angles in the annular direction on the top of the base;

[0012] Four correction components 1 are arranged at equal angles in the annular direction on the top of the base;

[0013] The correction component 1 includes a guide rod slidably mounted on the top of the base, the top of the guide rod is hinged with a two-way telescopic rod, the middle of the two-way telescopic rod is hinged on the support frame 2, the top of the hydraulic device is hinged with a spring telescopic rod 1, the telescopic end of the spring telescopic rod 1 is circular, the telescopic end of the spring telescopic rod 1 is installed with a pressure plate, and the bottom of the spring telescopic rod 1 is provided with a guide groove 1;

[0014] The top of the support plate is hinged to the inside of the guide groove 1, and the support plate is elastically hinged to the guide groove 1 through a spring sheet 1;

[0015] The guide assembly is used to push each of the guide rods to move outward.

[0016] Preferably, the telescopic end of the spring telescopic rod 1 is located at the top of the mold but does not contact the top of the mold, and the telescopic end of the spring telescopic rod 1 is made of high temperature resistant metal.

[0017] Preferably, the guide groove 1 is composed of a transverse groove and an inclined groove, the inclined groove is located at one end of the transverse groove away from the spring sheet 1, and the end of the inclined groove is inclined upward.

[0018] Preferably, the guide assembly includes an outer ring rotatably mounted on the top of the base, an inner ring rotatably mounted inside the outer ring, two metal rods 1 are symmetrically mounted on the outer circumference of the inner ring, two slots for the movement of the metal rods 1 are circumferentially provided at equal angles on the outer circumference of the outer ring, a telescopic rod is hinged on the outer side of one of the metal rods 1, and the top of the outer ring is circumferentially provided with metal rods 2 equal in number to the correction assembly 1, and the ends of the metal rods 2 are movably clamped on the side of the guide rod.

[0019] Preferably, the correction component 2 includes a support frame 1 fixed to the top of the base, the top of the support frame 1 is hinged with a spring telescopic rod 3, the top of the support frame 1 is elastically connected to the middle part of the spring telescopic rod 3 through a spring sheet 2, the telescopic end of the spring telescopic rod 3 is provided with a guide groove 2, the guide groove 2 is composed of a second transverse groove and a second inclined groove, the end of the second inclined groove is inclined downward, and the support plate is slidably installed inside the guide groove 2 through a convex shaft.

[0020] Preferably, the correction component 2 also includes a guide plate slidably mounted on the top of the support frame 1, the guide plate is divided into two parts, a thin part and a thick part, and the thin part and the thick part are inclined transitionally processed, the guide plate is inserted between the support frame 1 and the spring telescopic rod 3, and a guide rod sliding on the top of the support frame 1 is installed on the outer side of the guide plate, and the guide rod is in contact with the outer periphery of the metal rod 1.

[0021] Preferably, the guide assembly further comprises a metal ring arranged on an outer periphery of each metal rod, the metal ring is located on the outer side of the guide rod, and the interior of the outer ring is elastically connected to the inner ring via an arc spring telescopic rod.

[0022] Preferably, a guide groove three and a positioning groove are provided on the outer side of the base, the bottom of the guide groove three is higher than the bottom of the positioning groove, and the telescopic rod moves inside the guide groove three.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention cooperates with structures such as a correction component and a support component, and pushes each guide rod to move outward through the guide component. The guide rod drives the lower end of the two-way telescopic rod to move, and its upper end pushes the spring telescopic rod to move. The telescopic end of the spring telescopic rod touches the edge of the metal raw material, and each spring telescopic rod touches at the same time, so that the center point of the metal raw material and the center point of the mold are located on the same axis. During the movement of the spring telescopic rod, the top of the support plate moves inside the guide groove. When the support plate leaves the horizontal groove and enters the inclined groove, according to its trajectory, the telescopic end of the spring telescopic rod drives the pressing plate to squeeze the top of the metal raw material, so that it better fits the top of the mold, while improving the strength qualification rate of the gear, further enhancing the strength of the forged gear.

[0025] The present invention cooperates with the structures of the guide component and the correction component, and reverses the inner ring through the telescopic rod and the metal rod. At this time, according to the limitation of the metal ring, it can compress the guide rod to move, and the guide rod pushes the guide plate, so that its inclined surface pushes the spring telescopic rod three. Since the spring telescopic rod three moves on the side of the support plate through the guide groove two, according to the trajectory of the guide groove two, the movable end of the spring telescopic rod three will approach the metal raw material, and finally rise and lift the metal raw material through the second inclined groove in the guide groove two. Further, it is convenient for subsequent manual clamping of the forged metal raw material through pliers, thereby reducing the cost of manual labor.

[0026] The present invention cooperates with structures such as the guide assembly and the positioning groove. When the telescopic rod and the metal rod one force the inner ring to reverse, the telescopic rod can be pressed to descend, and it will disengage from the guide groove three and be located inside the positioning groove. Furthermore, it can be clearly seen from the height difference between the guide groove three and the positioning groove that the telescopic rod will eventually be stuck inside the positioning groove, so that the operator does not have to control the position of the telescopic rod all the time. After the work is completed, the telescopic rod is pushed upward to disengage from the positioning groove, and the arc spring telescopic rod forces the inner ring to return to the original position, further improving the convenience of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the appearance structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the top structural position of the base of the present invention;

[0029] Figure 3 It is a schematic diagram of the structural coordination between the base and the correction component of the present invention;

[0030] Figure 4 It is a schematic diagram of the coordination of the guiding component and the correcting component of the present invention;

[0031] Figure 5 For the present invention Figure 4 The enlarged schematic diagram at A in the middle;

[0032] Figure 6 It is a schematic diagram of the cooperation between the base and the guide assembly structure of the present invention;

[0033] Figure 7 For the present invention Figure 6 The enlarged schematic diagram at A in the middle;

[0034] Figure 8 This is a schematic diagram of the appearance of the guide assembly of the present invention;

[0035] Fig. 9 It is a schematic diagram of the internal structure of the outer ring of the present invention.

[0036] In the figure: 1. base; 2. hydraulic equipment; 3. guide assembly; 31. outer ring; 32. metal rod one; 33. telescopic rod; 34. metal ring; 35. inner ring; 36. arc spring telescopic rod; 37. metal rod two; 4. mold; 5. correction assembly one; 51. guide rod; 52. two-way telescopic rod; 53. spring telescopic rod one; 54. pressure plate; 55. guide groove one; 6. support assembly; 61. spring telescopic rod two; 62. support plate; 63. spring sheet one; 7. correction assembly two; 71. support frame one; 72. guide plate; 73. guide rod; 74. spring sheet two; 75. spring telescopic rod three; 76. guide groove two; 8. support frame two; 9. guide groove three; 10. positioning groove. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] like Figures 1 to 9 As shown, the present invention provides a spur gear forging device, comprising a hydraulic device 2 and a base 1;

[0039] Rotate the guide assembly 3 installed inside the base 1;

[0040] A mold 4 fixedly mounted on the top of the base 1;

[0041] Four support components 6 arranged on the periphery of the mold 4;

[0042] The support assembly 6 includes a spring telescopic rod 2 61 arranged outside the mold 4, a support plate 62 is elastically connected to the spring telescopic rod 2 61, and a spring sheet 1 63 is installed on the top of the support plate 62;

[0043] The spur gear forging device also includes a support frame 8 installed on the top of the base 1;

[0044] Two correction components 7 are arranged at equal angles on the top of the base 1 in an annular direction;

[0045] Four correction components 5 are arranged at equal angles on the top of the base 1 in a circular direction;

[0046] The correction component 15 includes a guide rod 51 slidably mounted on the top of the base 1, a bidirectional telescopic rod 52 is hinged on the top of the guide rod 51, the middle part of the bidirectional telescopic rod 52 is hinged on the support frame 28, a spring telescopic rod 153 is hinged on the top of the hydraulic device 2, the telescopic end of the spring telescopic rod 153 is circular, a pressing plate 54 is installed on the telescopic end of the spring telescopic rod 153, and a guide groove 155 is provided at the bottom of the spring telescopic rod 153;

[0047] The top of the support plate 62 is hinged to the inside of the guide groove 55, and the support plate 62 is elastically hinged to the guide groove 55 through a spring sheet 63;

[0048] The guide assembly 3 is used to push each guide rod 51 to move outward.

[0049] The guide groove 55 is composed of a transverse groove and an inclined groove. The inclined groove is located at one end of the transverse groove away from the spring sheet 63, and the end of the inclined groove is inclined upward.

[0050] By adopting the above scheme, after the metal raw material is placed on the top of the mold 4, the guide assembly 3 can push each guide rod 51 to move outward, and the guide rod 51 drives the lower end of the two-way telescopic rod 52 to move, and the upper end thereof pushes the spring telescopic rod 1 53 to move, and the telescopic end of the spring telescopic rod 1 53 contacts the edge of the metal raw material, and each spring telescopic rod 1 53 contacts at the same time, so that the center point of the metal raw material and the center point of the mold 4 are located on the same axis, so that the strength of the metal raw material after the hydraulic equipment 2 processes the metal raw material reaches the qualified standard;

[0051] It should also be noted that during the movement of the spring telescopic rod 53, the top of the support plate 62 moves inside the guide groove 55. When the support plate 62 leaves the horizontal groove and enters the inclined groove, according to its trajectory and the pulling of the spring sheet 63, the telescopic end of the spring telescopic rod 53 can drive the pressure plate 54 to descend and squeeze the top of the metal raw material, so that it can better fit the top of the mold 4, further enhancing the strength of the forged gear.

[0052] like Figure 2-Figure 5 As shown, the telescopic end of the spring telescopic rod 53 is located at the top of the mold 4 but does not contact the top of the mold 4, and the telescopic end of the spring telescopic rod 53 is made of high temperature resistant metal.

[0053] The above solution is adopted: the material of the telescopic end of the spring telescopic rod 53 is such that after long-term contact with the heated metal raw material, the end will not be deformed due to overheating, thereby causing the inability to resist and correct the position of the metal raw material;

[0054] When the end of the hydraulic equipment 2 descends and pressurizes the metal raw material, it will first contact the pressure plate 54. During the continuous descending process, the end of the hydraulic equipment 2 will be compressed by squeezing the spring telescopic rod 2 61 through the spring telescopic rod 1 53 and the support plate 62, and the two-way telescopic rod 52 is also compressed, thereby preventing the device from being crushed and damaged during operation.

[0055] like Figure 1-Figure 3 and Figure 8 As shown, the guide assembly 3 includes an outer ring 31 rotatably mounted on the top of the base 1, an inner ring 35 is rotatably mounted inside the outer ring 31, two metal rods 32 are symmetrically mounted on the outer circumference of the inner ring 35, two grooves for the movement of the metal rods 32 are circumferentially provided at equal angles on the outer circumference of the outer ring 31, a telescopic rod 33 is hinged on the outer side of one of the metal rods 32, and the top of the outer ring 31 is circumferentially provided with metal rods 37 equal in number to the correction assembly 5, and the ends of the metal rods 37 are movably clamped on the side of the guide rod 51.

[0056] The above scheme is adopted: the inner ring 35 is rotated forwardly by the telescopic rod 33 and the metal rod 1 32. It should be noted that the metal rod 1 32 is located at the end of the slot at this time, and the metal rod 1 32 can only rotate forwardly to drive the outer ring 31 to rotate synchronously, while the outer ring 31 drives the metal rod 2 37 to resist the guide rod 51 and extend outward. Furthermore, each correction component 1 5 can work synchronously and improve the smoothness of the device operation.

[0057] like Figure 1-Figure 9As shown, the correction component 2 7 includes a support frame 1 71 fixed to the top of the base 1, and the top of the support frame 1 71 is hinged with a spring telescopic rod 3 75. The top of the support frame 1 71 is elastically connected to the middle part of the spring telescopic rod 3 75 through a spring sheet 2 74. The telescopic end of the spring telescopic rod 3 75 is provided with a guide groove 2 76, which is composed of a second transverse groove and a second inclined groove. The end of the second inclined groove is inclined downward, and the support plate 62 is slidably installed inside the guide groove 2 76 through a convex shaft.

[0058] The correction component 2 7 also includes a guide plate 72 slidably installed on the top of the support frame 1 71. The guide plate 72 is divided into two parts, a thin part and a thick part, and the thin part and the thick part are inclined transitionally processed. The guide plate 72 is inserted between the support frame 1 71 and the spring telescopic rod 3 75. A guide rod 73 sliding on the top of the support frame 1 71 is installed on the outer side of the guide plate 72, and the guide rod 73 is in contact with the outer periphery of the metal rod 1 32.

[0059] The guide assembly 3 also includes a metal ring 34 arranged on the outer periphery of each metal rod 32. The metal ring 34 is located on the outer side of the guide rod 73. The interior of the outer ring 31 is elastically connected to the inner ring 35 through an arc spring telescopic rod 36.

[0060] The above scheme is adopted: the inner ring 35 is reversed by the telescopic rod 33 and the metal rod 1 32. At this time, according to the limitation of the metal ring 34, it can compress the guide rod 73 to move, and the guide rod 73 pushes the guide plate 72, so that its inclined surface pushes the spring telescopic rod 3 75. Since the spring telescopic rod 3 75 is movable on the side of the support plate 62 through the guide groove 2 76, according to the trajectory of the guide groove 2 76, the movable end of the spring telescopic rod 3 75 will be close to the metal raw material, and finally rise through the second inclined groove in the guide groove 2 76 and lift the forged metal raw material. Further, it is convenient for subsequent manual labor to clamp the metal raw material with pliers, thereby reducing the cost of manual labor.

[0061] like Figure 1-Figure 8 As shown, a guide groove 3 9 and a positioning groove 10 are provided on the outer side of the base 1 , the bottom of the guide groove 3 9 is higher than the bottom of the positioning groove 10 , and the telescopic rod 33 moves inside the guide groove 3 9 .

[0062] With the above solution, when the telescopic rod 33 and the metal rod 1 32 force the inner ring 35 to reverse, the telescopic rod 33 can be pressed down, and it will be out of the guide groove 3 9 and located inside the positioning groove 10. Furthermore, it can be clearly seen from the height difference between the guide groove 3 9 and the positioning groove 10 that the telescopic rod 33 will eventually be stuck inside the positioning groove 10, so that the operator does not have to control the position of the telescopic rod 33 all the time. After the work is completed, the telescopic rod 33 is pushed upward to be out of the positioning groove 10, and the arc spring telescopic rod 36 forces the inner ring 35 to return to the original position, further improving the convenience of the device.

[0063] It should be noted that the metal rod 37 is clamped with the guide rod 51, and since the guide rod 51 is movably clamped on the top of the base 1, when the inner ring 35 is reversed, it will not drive the outer ring 31 to rotate at the same time through the arc spring telescopic rod 36. Instead, the arc spring telescopic rod 36 is compressed, so that it has the elasticity to force the inner ring 35 to return to its original state.

[0064] The working principle and use process of the present invention:

[0065] When the metal raw material is located at the top of the mold 4, the inner ring 35 is rotated forwardly by the telescopic rod 33 and the metal rod 1 32. It should be noted that the metal rod 1 32 is located at the end of the slot at this time, and the metal rod 1 32 can only rotate forwardly to drive the outer ring 31 to rotate synchronously, and the outer ring 31 drives the metal rod 2 37 to resist the guide rod 51 and extend outward;

[0066] The guide rod 51 drives the lower end of the two-way telescopic rod 52 to move, and its upper end pushes the spring telescopic rod 1 53 to move. The telescopic end of the spring telescopic rod 1 53 contacts the edge of the metal raw material, and the spring telescopic rods 1 53 contact at the same time, so that the center point of the metal raw material and the center point of the mold 4 are located on the same axis. During the movement of the spring telescopic rod 1 53, the top of the support plate 62 moves inside the guide groove 1 55. When the support plate 62 leaves the horizontal groove and enters the inclined groove, according to its trajectory and the pulling of the spring sheet 1 63, the telescopic end of the spring telescopic rod 1 53 can drive the pressing plate 54 to descend and squeeze the top of the metal raw material, so that it can better fit the top of the mold 4.

[0067] After forging is completed, the inner ring 35 is reversed by the telescopic rod 33 and the metal rod 1 32. At this time, according to the limitation of the metal ring 34, it can force the guide rod 73 to move, and the guide rod 73 pushes the guide plate 72, so that its inclined surface pushes the spring telescopic rod three 75. Since the spring telescopic rod three 75 moves on the side of the support plate 62 through the guide groove two 76, according to the trajectory of the guide groove two 76, the movable end of the spring telescopic rod three 75 will be close to the metal raw material, and finally rise through the second inclined groove in the guide groove two 76 and lift the forged metal raw material.

[0068] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0069] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spur gear forging device, comprising a hydraulic device (2), characterized in that: Also includes a base (1); A guide assembly (3) rotatably mounted inside the base (1); A mold (4) fixedly mounted on the top of the base (1); Four support components (6) arranged on the periphery of the mold (4); The support assembly (6) comprises a second spring telescopic rod (61) arranged outside the mold (4), the second spring telescopic rod (61) being elastically connected to a support plate (62), and a first spring sheet (63) being installed on the top of the support plate (62); The spur gear forging device also includes a second support frame (8) installed on the top of the base (1); Two correction components (7) are arranged at equal angles in the annular direction on the top of the base (1); Four correction components (5) are arranged at equal angles in a circular direction on the top of the base (1); The correction component 1 (5) comprises a guide rod (51) slidably mounted on the top of the base (1), the top of the guide rod (51) is hinged with a bidirectional telescopic rod (52), the middle of the bidirectional telescopic rod (52) is hinged on the support frame 2 (8), the top of the hydraulic device (2) is hinged with a spring telescopic rod 1 (53), the telescopic end of the spring telescopic rod 1 (53) is circular, the telescopic end of the spring telescopic rod 1 (53) is installed with a pressure plate (54), and the bottom of the spring telescopic rod 1 (53) is provided with a guide groove 1 (55); The top of the support plate (62) is hinged to the inside of the guide groove (55), and the support plate (62) is elastically hinged to the guide groove (55) through a spring sheet (63); The guide assembly (3) is used to push each of the guide rods (51) to move outward.

2. The spur gear forging device according to claim 1, characterized in that: The telescopic end of the spring telescopic rod (53) is located at the top of the mold (4) but does not contact the top of the mold (4), and the telescopic end of the spring telescopic rod (53) is made of high temperature resistant metal.

3. The spur gear forging device according to claim 2, characterized in that: The guide groove 1 (55) is composed of a transverse groove and an inclined groove. The inclined groove is located at one end of the transverse groove away from the spring sheet 1 (63), and the end of the inclined groove is inclined upward.

4. The spur gear forging device according to claim 1, characterized in that: The guide assembly (3) comprises an outer ring (31) rotatably mounted on the top of the base (1), an inner ring (35) rotatably mounted inside the outer ring (31), two metal rods (32) symmetrically mounted on the outer periphery of the inner ring (35), two slots for the movement of the metal rods (32) are provided at equal angles in the circumferential direction on the outer periphery of the outer ring (31), a telescopic rod (33) is hingedly connected to the outer side of one of the metal rods (32), and the top of the outer ring (31) is circumferentially mounted with metal rods (37) equal in number to the correction assembly (5), and the ends of the metal rods (37) are movably clamped to the side of the guide rod (51).

5. The spur gear forging device according to claim 4, characterized in that: The correction component 2 (7) comprises a support frame 1 (71) fixedly mounted on the top of the base (1), the top of the support frame 1 (71) is hinged with a spring telescopic rod 3 (75), the top of the support frame 1 (71) is elastically connected to the middle of the spring telescopic rod 3 (75) through a spring sheet 2 (74), a guide groove 2 (76) is provided at the telescopic end of the spring telescopic rod 3 (75), the guide groove 2 (76) is composed of a second transverse groove and a second inclined groove, the end of the second inclined groove is inclined downward, and the support plate (62) is slidably installed inside the guide groove 2 (76) through a convex shaft.

6. The spur gear forging device according to claim 5, characterized in that: The correction component 2 (7) also includes a guide plate (72) slidably mounted on the top of the support frame 1 (71), the guide plate (72) is divided into two parts, a thin part and a thick part, and the two parts are subjected to an inclined transition process, the guide plate (72) is inserted between the support frame 1 (71) and the spring telescopic rod 3 (75), and a guide rod (73) sliding on the top of the support frame 1 (71) is installed on the outer side of the guide plate (72), and the guide rod (73) contacts the outer periphery of the metal rod 1 (32).

7. The spur gear forging device according to claim 6, characterized in that: The guide assembly (3) further comprises a metal ring (34) arranged on the outer periphery of each metal rod (32), wherein the metal ring (34) is located on the outer side of the guide rod (73), and the interior of the outer ring (31) is elastically connected to the inner ring (35) via an arc-shaped spring telescopic rod (36).

8. The spur gear forging device according to claim 7, characterized in that: A guide groove three (9) and a positioning groove (10) are provided on the outer side of the base (1); the bottom of the guide groove three (9) is higher than the bottom of the positioning groove (10); and the telescopic rod (33) moves inside the guide groove three (9).

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