Rotatable center frame

Abstract

The invention discloses a rotatable center frame, which relates to the technical field of tool brackets and is characterized in that an outer sleeve seat and an inner sleeve form a bearing part structure to ensure that a workpiece and the inner sleeve rotate synchronously; relative static representation occurs between a workpiece and a fixing pin and other structures, and friction damage cannot occur, but the key point is that an inner clamping tool is further additionally arranged for an inner sleeve, the eccentric and non-perfect-circle rotation state of a triangular clamping block relative to a connecting rod is specifically utilized, and the triangular clamping block serves as a key structure for maintaining fixation of the workpiece; the regular triangular structure characteristic of the triangular clamping block is mainly utilized, on the basis of maintaining the fixing mode of a workpiece, the two edge positions of the triangular structure make direct contact with the surface position of the workpiece, the local small-amplitude deformation process existing in the workpiece rotating process is avoided, and finally the triangular clamping block is additionally arranged to optimize the kinetic energy ring. The purpose is to reduce abnormal influences caused by stress changes of workpieces.

Description

Technical Field

[0001] The present invention relates to the technical field of tooling brackets, and particularly relates to a rotatable steady rest. Background Art

[0002] A steady rest is an important auxiliary device in lathe machining, mainly playing roles such as enhancing rigidity, supporting and positioning, controlling precision, and maintaining stable machining. Specifically, it can be applied in the machining process of heavy and long workpieces. For relevant technical content, reference can be made to the related art in Publication No. CN102848210A.

[0003] To meet the requirements of lathe machining, on the basis of a conventional steady rest, the rotational connection between the workpiece and the steady rest is optimized. However, this will increase the frictional damage between the fixed structures (such as jaw structures) on the steady rest and the workpiece. The key lies in that on the basis of maintaining the position of the workpiece, the workpiece is in a follow-up high-speed rotation state, and under the action of centrifugal force, the working burden of the fixed structure will also increase. Especially when a long workpiece is in follow-up high-speed rotation, problems such as internal stress deformation of the workpiece at a local position due to the influence of centrifugal force will occur. Although this will not cause direct deformation of the workpiece, problems such as local vibration or increased jitter may occur. Such problems not only affect the requirements of lathe machining, but also critically affect the stability of the central structure. For this reason, the present application proposes a solution. Summary of the Invention

[0004] The purpose of the present invention is to provide a rotatable steady rest, which is used to solve the problems that during the process of the steady rest stabilizing the workpiece, affected by the centrifugal force generated by high-speed rotation, on the one hand, it will increase the working burden of the intermediate rest for fixing the workpiece, and on the other hand, it will also increase the risk of workpiece jitter due to internal stress deformation.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A rotatable steady rest includes an outer sleeve seat and an inner sleeve. The inner sleeve is arranged in the outer sleeve seat, and a ball group is arranged between the outer wall of the inner sleeve and the inner wall of the outer sleeve seat. An inner shrinkage sleeve and an inner shrinkage clamping block are arranged at one end of the inner sleeve exposed outside the outer sleeve seat;

[0006] An inner clamping tooling is arranged on the outer wall of the inner sleeve corresponding to the inner wall of the outer sleeve seat. The inner clamping tooling includes a connecting rod, a triangular clamping block, and a kinetic energy ring. An eccentric shaft is arranged in the connecting rod, and the triangular clamping block and the kinetic energy ring are arranged on the eccentric shaft in an alternately spaced manner;

[0007] The cross-section of the triangular clamping block along the length direction of the connecting rod is a regular triangular prism shape, and rubber sheets are attached to the end positions of the edges in the triangular clamping block. The inner clamping tooling is arranged in a circular array along the center point of the inner sleeve, and the number of the inner clamping tooling is three or more.

[0008] Further set as: a conical inclined surface is formed between the inner wall of the retracting sleeve and the outer wall of the retracting clamping block, and the retracting clamping blocks are arranged in an annular array along the center point of the inner sleeve.

[0009] Further set as: one end of the retracting sleeve is threadedly connected to the inner sleeve, and fixing pins are arranged on the retracting clamping blocks.

[0010] Further set as: the connecting rod is arranged parallel to the length direction of the inner sleeve, and both ends of the connecting rod are rotatably connected in the inner sleeve, and the center point of the eccentric shaft and the center point of the connecting rod are not on the same horizontal axis.

[0011] Further set as: an internal gear collar is rotatably installed on the outer wall of the other end of the inner sleeve, and a gear set is arranged at a position corresponding to one end of the connecting rod in the internal gear collar.

[0012] Further set as: the kinetic energy ring is composed of a mounting block, a metal fixing ring and sliding beads, the metal fixing ring is installed on the outer edge of the mounting block, the sliding beads are arranged in an annular array on the metal fixing ring, and the sliding beads maintain a sliding state on the metal fixing ring.

[0013] Further set as: the cross-section of the eccentric shaft along the length direction of the inner sleeve is a perfect circle, mounting openings corresponding to the eccentric shaft are opened at the center points of the mounting block and the triangular clamping block, and the cross-sections of the mounting openings on the mounting block and the triangular clamping block are both elliptical.

[0014] Further set as: the diameter of the mounting opening on the mounting block is larger than the diameter of the mounting opening on the triangular clamping block, and the minor axis diameter of the mounting openings in the triangular clamping block and the mounting block is larger than the outer diameter of the eccentric shaft.

[0015] Further set as: the distance between the end of the edge angle in the angle clamping block and the eccentric shaft is greater than the distance between the sliding bead and the eccentric shaft.

[0016] The present invention has the following beneficial effects:

[0017] 1. Improve the intermediate support used in machine tool processing, form a bearing part with an outer sleeve seat and an inner sleeve, and fix the workpiece on the inner sleeve by means of retracting clamping and fixing pins to fix the workpiece. When the workpiece is in follow-up movement, the workpiece and structures such as fixing pins show relative static state and there will be no problem of frictional damage.

[0018] 2. Based on the above content, the key is to add several internal clamping tools at the inner wall position of the inner sleeve. The internal clamping tools adopt a long-distance fixing method, which can directly fit and fix the long-distance part of the workpiece. The purpose is to avoid the problems of local small-amplitude deformation or vibration caused by the change of centrifugal force during the rotation of the workpiece. The key in the internal clamping tools is to utilize the eccentric and non-circular rotation state of the triangular clamping block relative to the connecting rod, combined with the two parameters of the eccentricity between the eccentric shaft and the connecting rod and the maximum diameter of the triangular clamping block, and utilize the regular triangular structure characteristics in the triangular clamping block to clamp the workpiece body more stably;

[0019] 3. Based on the triangular clamping block, kinetic rings are further arranged in an alternating and staggered manner. The kinetic rings do not participate in the fixed clamping movement of the workpiece by the triangular clamping block, but due to the problem of uneven gravity generated by multiple sliding beads in the kinetic rings, the kinetic rings perform non-circular rotational movements on the eccentric shaft with the centrifugal force of the workpiece as the kinetic energy. The purpose is to, on the basis of the triangular clamping block maintaining the fixed way of the workpiece, actively "consume" the torque change of the workpiece to reduce the abnormal influence caused by the stress change of the workpiece. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of a rotatable center rest proposed by the present invention;

[0022] Figure 2 It is Figure 1 a sectional view of the outer sleeve seat;

[0023] Figure 3 It is Figure 2 a sectional view of the inner sleeve in;

[0024] Figure 4 It is Figure 3 the front view of;

[0025] Figure 5 It is a schematic structural diagram of the internal clamping tool in the present invention;

[0026] Figure 6 It is Figure 5 a schematic structural diagram of the connecting rod in;

[0027] Figure 7 It is Figure 6 a partial split view of;

[0028] Figure 8 For Figure 6 the sectional view of the triangular clamping block and the kinetic energy ring corresponding to the eccentric shaft.

[0029] In the figure: 1. Outer sleeve seat; 2. Retracting sleeve; 3. Inner sleeve; 4. Inner gear sleeve ring; 5. Retracting clamping block; 6. Gear set; 7. Connecting rod; 701. Eccentric shaft; 8. Triangular clamping block; 9. Kinetic energy ring; 901. Mounting block; 902. Metal fixing ring; 903. Sliding bead. Specific embodiments

[0030] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0031] Embodiment 1: Specifically for the steady rest used in machine tool processing, for the clamping process of a long workpiece, affected by the centrifugal force generated by high-speed rotation, on the one hand, it will exacerbate the working burden of the steady rest for fixing the workpiece, and on the other hand, it will also increase the risk of workpiece jitter due to internal stress deformation. The following solutions are proposed:

[0032] Refer to Figures 1 to 8 , a rotatable steady rest in this embodiment includes an outer sleeve seat 1 and an inner sleeve 3. The inner sleeve 3 is arranged in the outer sleeve seat 1, and a ball set is arranged between the outer wall of the inner sleeve 3 and the inner wall of the outer sleeve seat 1. At one end of the inner sleeve 3 exposed from the outer sleeve seat 1, a retracting sleeve 2 and a retracting clamping block 5 are arranged;

[0033] An inner clamping tooling is arranged on the outer wall of the inner sleeve 3 corresponding to the inner wall of the outer sleeve seat 1. The inner clamping tooling includes a connecting rod 7, a triangular clamping block 8 and a kinetic energy ring 9. An eccentric shaft 701 is arranged in the connecting rod 7, and the triangular clamping block 8 and the kinetic energy ring 9 are arranged on the eccentric shaft 701 in an alternating and spaced manner;

[0034] The cross-section of the triangular clamping block 8 along the length direction of the connecting rod 7 is a regular triangular prism, and a rubber sheet is attached to the end of the edge angle in the triangular clamping block 8. The inner clamping tooling is arranged in a circular array along the center point of the inner sleeve 3, and the number of the inner clamping tooling is three or more. A conical inclined surface is formed between the inner wall of the retracting sleeve 2 and the outer wall of the retracting clamping block 5, and the retracting clamping block 5 is arranged in a circular array along the center point of the inner sleeve 3. One end of the retracting sleeve 2 is threadedly connected to the inner sleeve 3, and a fixing pin is arranged on the retracting clamping block 5.

[0035] Basic principle: The center rest proposed by the present invention essentially fixes the workpiece in the processing state. Taking the simplest turning as an example, after one end of the workpiece is fixed on the lathe, if the workpiece is relatively long, it is necessary to fix the position of the other end of the workpiece. However, because the workpiece needs to rotate at high speed, specifically, based on the outer sleeve seat 1 and the inner sleeve 3, a bearing member is formed between the outer sleeve 1 and the inner sleeve 3 through a roller group. Therefore, after the workpiece is fixed in the inner sleeve 3, the inner sleeve 3 and the tool maintain a synchronous rotation state;

[0036] The retractable sleeve 2 and the retractable clamping block 5 in this embodiment will be described. Refer to Figure 2 and Figure 5 , where the retractable clamping block 5 is installed at one end of the inner sleeve 3, and the retractable sleeve 2 is installed on the inner sleeve 3 in a threaded connection manner. Combining the inclined surface design of the inner wall of the retractable sleeve 2 and the outer wall of the retractable clamping block 5, when the retractable sleeve 2 moves in the direction close to the retractable clamping block 5, driven by the interference of the inner wall of the retractable sleeve 2, the retractable clamping block 5 bends and deforms in the direction close to the center point of the inner sleeve 3. For this, a fixing pin corresponding to the center point direction of the inner sleeve 3 can be installed on the retractable clamping block 5. Thus, when the workpiece is inserted into the inner sleeve 3 and during the retraction of the retractable clamping block 5, the fixing pin can directly complete the fixing process of the workpiece. When the workpiece rotates synchronously with the inner sleeve 3, the fixing pin structure will not cause frictional damage to the workpiece, and the fixing pin structure itself will not cause frictional damage either.

[0037] Embodiment 2: An explanation of the inner clamping tooling in Embodiment 1 is as follows:

[0038] The connecting rod 7 is arranged parallel to the length direction of the inner sleeve 3, and both ends of the connecting rod 7 are rotatably connected in the inner sleeve 3. The center point of the eccentric shaft 701 and the center point of the connecting rod 7 are not on the same horizontal axis. An internal gear collar 4 is rotatably installed at the outer wall position of the other end of the inner sleeve 3. A gear set 6 is arranged at the position corresponding to one end of the connecting rod 7 in the internal gear collar 4. The kinetic energy ring 9 is composed of a mounting block 901, a metal fixing ring 902, and sliding beads 903. The metal fixing ring 902 is installed at the outer edge of the mounting block 901. The sliding beads 903 are arranged in a circular array on the metal fixing ring 902, and the sliding beads 903 maintain a sliding state on the metal fixing ring 902. The cross-section of the eccentric shaft 701 along the length direction of the inner sleeve 3 is a perfect circle. Mounting openings corresponding to the eccentric shaft 701 are opened at the center point positions of the mounting block 901 and the triangular clamping block 8, and the cross-sections of the mounting openings on the mounting block 901 and the triangular clamping block 8 are both elliptical. The diameter of the mounting opening on the mounting block 901 is larger than the diameter of the mounting opening on the triangular clamping block 8. The short-axis diameter of the mounting openings in the triangular clamping block 8 and the mounting block 901 is larger than the outer diameter of the eccentric shaft 701. The distance between the end of the edge angle in the angular clamping block 8 and the eccentric shaft 701 is greater than the distance between the sliding bead 903 and the eccentric shaft 701.

[0039] Solution description: Taking the technical content in Embodiment 1 as an example, although the fixing and clamping of the tool is completed by the fixing pin, when fixing and clamping a relatively long workpiece, due to the centrifugal force generated by the rotation of the workpiece, the part of the workpiece located between the retractable sleeve 2 and the lathe chuck will vibrate to different extents. In this embodiment, specifically, the part of the workpiece located inside the inner sleeve 3 is clamped for the second time, mainly with the inner clamping tooling. Taking Figure 3 as an example, specifically, the inner clamping tooling directly clamps the long-distance part of the workpiece, which can avoid the local small deformation of the workpiece due to the influence of centrifugal force, thereby further improving the stability during the fixing and clamping of the workpiece. The specific clamping process includes the following contents:

[0040] S1: Taking Figure 5 and Figure 6 as an example, the key structure for the inner clamping tooling to achieve fixed clamping is the triangular clamping block 8. After the workpiece is inserted into the inner sleeve 3, the triangular clamping block 8 is located at the middle position between the inner wall of the inner sleeve 3 and the outer wall of the workpiece. Therefore, it is also necessary to use the connecting rod 7 to change the position of the triangular clamping block 8, and the eccentric shaft 701 is also used to maintain the rotation mode of the triangular clamping block 8. When the connecting rod 7 rotates in a fixed direction, because the deflection shaft 701 and the connecting rod 7 are eccentrically designed, it can be directly understood that the triangular clamping block 8 rotates in a large-diameter eccentric rotation with the center point of the connecting rod 7 as the rotation point, so as to change the distance between the triangular clamping block 8 and the outer wall of the workpiece;

[0041] S2: Supplementary description based on S1: The connecting rod 7 specifically completes the rotation action through the gear set 6. The essence of the gear set 6 is the driven gear installed at one end of the connecting rod 7 and the gear groove on the inner wall of the inner gear sleeve 4, and the two form an internal meshing transmission relationship. When the inner gear sleeve 4 rotates in a fixed direction, and because the connecting rod 7 and the inner sleeve 3 only maintain a rotational connection, due to the internal meshing relationship between the inner gear sleeve 4 and the diameter of the driving gear, the connecting rod is driven to rotate in the same direction, thereby realizing the rotation process of the connecting rod. However, considering from the perspective of the fixing stability of the inner clamping tooling for the workpiece, the number of inner clamping toolings must be greater than three, and the installation positions of each inner clamping tooling are arranged at equal intervals in a ring shape;

[0042] S3: Based on Figure 6 for description, when the connecting rod 7 rotates in the clockwise direction, the triangular clamping block 8 therein will slowly approach the outer surface of the workpiece body. For this, refer to Figure 8The description is as follows. Since the installation opening at the center point of the triangular clamping block 8 is not a perfect circle but an oval design, and it is also necessary to further limit the minor axis diameter in the installation opening of the triangular clamping block 8 to be slightly larger than the outer diameter of the eccentric shaft 701. Therefore, when the triangular clamping block 8 rotates eccentrically, affected by gravity, the triangular clamping block 8 will also rotate in an undetermined direction on the eccentric shaft 701. The essential manifestation is that the triangular clamping block 8 is in the shape of a regular triangular prism. Specifically, it is composed of three oval blocks with exactly the same structure, and the three are directly fixed along the center point direction of the eccentric shaft 701. Then, under the action of gravity, it always maintains a state of being heavier at the bottom and lighter at the top (falling). The manifestation is that when the triangular clamping block 8 rotates in an undetermined direction, the lower side remains two edges, and the upper side remains one edge. However, by further limiting the diameter of the installation opening in the triangular clamping block 8, there is an upper limit to the "falling" process of the triangular clamping block 8 under the action of gravity;

[0043] S4: In S3, it is mainly used to introduce the "falling" process of the triangular clamping block 8 when the connecting rod 7 rotates until the triangular clamping block 8 contacts the workpiece surface. Theoretically, it is a certain edge on the lower side of the triangular clamping block 8 that contacts the workpiece surface. However, because the triangular clamping block 8 still has the ability to rotate on the eccentric shaft 701 until both edges on the lower side of the triangular clamping block 8 contact the workpiece surface and further interfere with the sliding of the triangular clamping block 8 relative to the eccentric shaft 701 along the corresponding workpiece diameter direction until the outer edge of the eccentric shaft 701 is completely blocked by the inner wall of the installation opening in the triangular clamping block 8, so as to ensure that the triangular clamping block 8 fixes and clamps the workpiece in a two-edge manner. After completing the fixing and clamping action of the triangular clamping block 8, referring to Figure 1 the internal gear collar 4 therein, and a fastening bolt structure is also provided. Since the rotation action of each connecting rod 7 depends on the internal gear collar 4, the function of the fastening bolt is to "fix" the internal gear collar 4 on the inner sleeve 3 to prevent the loosening of the internal gear collar 4 during the tooling process and affect the fixing and clamping process of the triangular clamping block 8;

[0044] It should be further noted that the key points of the present invention are two parameters, namely, the eccentricity L1 between the eccentric shaft 701 and the connecting rod 7 and the maximum diameter L2 of the triangular clamping block 8. Specifically, they need to be determined in combination with the outer diameter of the workpiece and the inner diameter of the inner sleeve 3. A simple explanation is given in the present invention: If the distance between the outer surface of the workpiece and the inner surface of the inner sleeve 3 is L, then the installation position of the connecting rod 7 is not at the position of L / 2. In essence, the rotation point between the connecting rod 7 and the inner sleeve 3 is closer to the inner wall position of the inner sleeve 3. Then, theoretically, the eccentric radius completed by the triangular clamping block 8 along the center point of the connecting rod 7 is L1 + L2. However, because the installation opening in the triangular clamping block 8 does not completely match the eccentric shaft 701, the actual eccentric radius fluctuates based on L1 + L2. The key purpose is to ensure that the triangular clamping block 8 can completely fit on the surface of the workpiece. Then, it can be further understood that: If the short-axis radius of the installation opening in the triangular clamping block 8 is L3 and the radius of the eccentric shaft 701 is L4, then the adjustable range when the triangular clamping block 8 clamps the workpiece is: 0 to L1 + L2 ± (L3 - L4).

[0045] Embodiment 3: Based on Embodiment 2, the working process of the kinetic energy ring is supplemented and described as follows:

[0046] Refer to Figure 8 for description. Figure 8 The area of the environmental dotted line in [reference] indicates the maximum ring diameter of the triangular clamping block 8, which is mainly used to indicate that the kinetic energy ring 903 is located in the dotted line area. It can be understood that: The kinetic energy ring 9 does not participate in the clamping action of the workpiece. However, in actual situations, due to the indefinite rotation of the triangular clamping block 8 and the eccentric shaft 701, the actual rotation trajectory of the triangular clamping block 8 is not a perfect circle, but only to ensure that the triangular clamping block 8 completes the clamping action on the workpiece;

[0047] Moreover, the diameter of the installation opening in the kinetic energy ring 9 is larger than that in the triangular clamping block 8. Therefore, after the triangular clamping block 8 completes the clamping action on the workpiece, the kinetic energy ring 9 will also rotate indefinitely on the eccentric shaft 701. In essence, it also "drops" under the influence of gravity. However, each sliding bead 902 on the kinetic energy ring 9 can slide freely on the metal fixed ring 902, resulting in uneven distribution of gravity. When the workpiece is completely clamped and fixed and not in a rotating motion, the kinetic energy ring 9 will perform an indefinite small-amplitude rotation motion on the eccentric shaft 701 under the uneven gravity distribution method. Theoretically, the kinetic energy ring 9 forms a structure similar to a perpetual motion machine due to the sliding ability of the sliding beads 903. However, in actual situations, a continuous small-amplitude rotation state cannot occur, and this part will not be elaborated further;

[0048] For this purpose, it is necessary to further limit the short axis diameter of the installation opening in the kinetic energy ring 9 to ensure that after the kinetic energy ring 9 "drops" to the maximum position on the eccentric shaft 701, the sliding ball 903 still does not contact the surface of the workpiece. The key content is that when the workpiece rotates synchronously with the inner sleeve 3, the kinetic energy ring 9 further rotates in an undirected manner on the eccentric shaft 701 under the action of centrifugal force, and the trajectory of the rotation action is not a perfect circle. When the workpiece vibrates slightly, the vibration will also be transmitted to the triangular clamp 8, which may affect the fixed clamping action. Therefore, the role of the kinetic energy ring 9 is reflected as follows:

[0049] The kinetic energy ring 9 rotates in a non-circular trajectory with the centrifugal force of the workpiece rotating as the power source. In addition, because a plurality of freely sliding beads are arranged on the metal fixing ring 902, the beads 903 are "swung" when the kinetic energy ring 9 rotates. Under the action of the centrifugal force, the beads 903 are "gathered" on the metal fixing ring 902 at the opposite direction of the workpiece body along the direction of the centrifugal force, resulting in the overall kinetic energy ring 9 moving in a small amplitude along the equation close to the inner wall of the inner sleeve 3, so as to Figure 8 Take this as an example to illustrate:

[0050] The mounting block 901 in the kinetic energy ring 9 moves upwards corresponding to the eccentric shaft 701, but the triangular clamp block 8 moves downwards corresponding to the eccentric shaft 701, thereby preliminarily maintaining the structural strength of the eccentric shaft 701. However, the key function is that when the workpiece rotates and local vibration (torque change) is generated due to changes in the rotation speed and rotation direction, the kinetic energy ring 9 preferentially senses the vibration change and performs a small amplitude non-directional and non-circular rotation, which is mainly to "consume" the stress change caused by the vibration, avoid local deformation of the workpiece due to the stress change, or play a role in reducing the vibration sense;

[0051] It is also necessary to ensure that there is a gap between the triangular clamp block 8 and the kinetic energy ring 9 when the triangular clamp block 8 and the kinetic energy ring 9 are mounted on the eccentric shaft 7 in an interlaced manner because the kinetic energy ring 9 needs to rotate slightly when the triangular clamp block 8 and the kinetic energy ring 9 are mounted on the eccentric shaft 7 in an interlaced manner.

[0052] In summary, the bearing structure is formed by the outer sleeve seat and the inner sleeve, ensuring that the workpiece rotates synchronously with the inner sleeve. When the workpiece is fixed to the inner sleeve through structures such as fixing pins, there is a relative static state between the workpiece and the fixing pins and other structures, and no friction damage problem will occur. However, the key lies in: an inner clamping tooling is further added to the inner sleeve. Specifically, the triangular clamping block rotates eccentrically and non-circularly relative to the connecting rod. The triangular clamping block is used as the key structure to maintain the fixation of the workpiece. The regular triangular prism structure characteristics of the triangular clamping block are mainly utilized. Based on the way of maintaining the fixation of the workpiece, the two edges of the triangular prism structure directly contact the surface position of the workpiece, avoiding the local small deformation process during the rotation of the workpiece. Finally, a kinetic energy ring is optimized by adding the triangular clamping block, and its purpose is to reduce the abnormal influence caused by the stress change of the workpiece.

[0053] The above are only examples and descriptions of the structure of the present invention. Those skilled in the art of this technology can make various modifications, supplements, or use similar methods to replace the specific embodiments described, as long as they do not deviate from the structure of the invention or exceed the scope defined by this claims, they should all belong to the protection scope of the present invention.

Claims

1. A rotatable steady rest, comprising an outer sleeve seat (1) and an inner sleeve (3), characterized in that, The inner sleeve (3) is arranged in the outer sleeve seat (1), and a ball set is arranged between the outer wall of the inner sleeve (3) and the inner wall of the outer sleeve seat (1). An inner shrinkage sleeve (2) and an inner shrinkage clamping block (5) are arranged at one end of the inner sleeve (3) exposed from the outer sleeve seat (1). An inner clamping tooling is arranged at the outer wall position of the inner sleeve (3) corresponding to the inner wall of the outer sleeve seat (1). The inner clamping tooling includes a connecting rod (7), a triangular clamping block (8) and a kinetic energy ring (9). An eccentric shaft (701) is arranged in the connecting rod (7), and the triangular clamping block (8) and the kinetic energy ring (9) are arranged on the eccentric shaft (701) in an alternately spaced manner. The cross-section of the triangular clamping block (8) along the length direction of the connecting rod (7) is a regular triangular shape, and a rubber sheet is attached to the end position of the edge angle in the triangular clamping block (8). The inner clamping tooling is arranged in a circular array along the center point of the inner sleeve (3), and the number of the inner clamping tooling is three or more.

2. The rotatable steady rest according to claim 1, characterized in that, A conical inclined surface is formed between the inner wall of the inner shrinkage sleeve (2) and the outer wall of the inner shrinkage clamping block (5), and the inner shrinkage clamping block (5) is arranged in a circular array along the center point of the inner sleeve (3).

3. The rotatable steady rest according to claim 2, characterized in that, One end of the inner shrinkage sleeve (2) is threadedly connected to the inner sleeve (3), and a fixing pin is arranged on the inner shrinkage clamping block (5).

4. A rotatable steady rest according to claim 1, characterized in that, The arrangement direction of the connecting rod (7) is parallel to the length direction of the inner sleeve (3), and both ends of the connecting rod (7) are rotatably connected in the inner sleeve (3). The center point of the eccentric shaft (701) and the center point of the connecting rod (7) are not on the same horizontal axis.

5. The rotatable steady rest according to claim 4, characterized in that, An inner gear collar (4) is rotatably installed on the outer wall at the other end of the inner sleeve (3), and a gear set (6) is arranged at one end of the inner gear collar (4) corresponding to the connecting rod (7).

6. The rotatable steady rest according to claim 1, characterized in that, The kinetic energy ring (9) is composed of a mounting block (901), a metal fixing ring (902) and sliding beads (903). The metal fixing ring (902) is installed on the outer edge part of the mounting block (901), and the sliding beads (903) are arranged in a circular array on the metal fixing ring (902), and the sliding beads (903) maintain a sliding state on the metal fixing ring (902).

7. The rotatable steady rest according to claim 6, wherein, The cross-section of the eccentric shaft (701) along the length direction of the inner sleeve (3) is a regular circular shape. Mounting openings corresponding to the eccentric shaft (701) are opened at the center point positions of the mounting block (901) and the triangular clamping block (8), and the cross-sections of the mounting openings on the mounting block (901) and the triangular clamping block (8) are both elliptical.

8. The rotatable steady rest according to claim 7, characterized in that, The caliber of the mounting opening on the mounting block (901) is larger than the caliber of the mounting opening on the triangular clamping block (8), and the minor axis diameter of the mounting openings in the triangular clamping block (8) and the mounting block (901) is larger than the outer diameter of the eccentric shaft (701).

9. The rotatable steady rest according to claim 6, wherein, The distance between the end position of the edge angle in the angle clamping block (8) and the eccentric shaft (701) is greater than the distance between the sliding bead (903) and the eccentric shaft (701).

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