Double-cranked link structure for gripping mandrel

Abstract

The present application relates to a kind of double-crank link structure for clamping mandrel, including two clamping posts arranged in horizontal direction, driving mechanism for driving two described clamping posts in vertical plane same direction rotation, the rotation track of two described clamping posts is respectively located in two parallel planes, the rotation track of two described clamping posts is close to one side with overlapping point, and two described clamping posts coincide in each rotation cycle in overlapping point.For the purpose of achieving continuous transport mandrel in prior art, the motion trajectory of clamping equipment is generally arc whole circle, which has the problem of larger swing operation space.

Description

Technical Field

[0001] This invention relates to the field of mandrel manufacturing technology, and more specifically to a double crank connecting rod structure for clamping mandrels. Background Technology

[0002] A mandrel is a mechanical transmission device, typically composed of a cylinder or cone, used to transmit torque and withstand shear forces. As a core component in a mechanical device, it supports and controls the central axis of elements (such as sliding or rotating structures).

[0003] In existing technologies, during the mandrel clamping and transfer process, traditional clamping equipment, when handling a mandrel exceeding 15 meters in length and weighing over 3 tons from the production line to the waiting roller conveyor, clamps and fixes the mandrel, and drives it to lift and rotate to transfer it onto the roller conveyor. However, to achieve continuous mandrel transfer, the movement trajectory of the clamping equipment is usually an arc-shaped circle, which results in a large swing operation space. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a double crank connecting rod structure for clamping mandrels, so as to solve the problem that in order to achieve continuous transfer of mandrels in the prior art, the motion trajectory of the clamping device is usually an arc-shaped circle, which has a large swing operation space.

[0005] This invention is achieved through the following technical solution: A double-crank connecting rod structure for clamping a mandrel includes two clamping columns arranged in a horizontal direction and a drive mechanism for driving the two clamping columns to rotate in the same direction in a vertical plane. The rotation trajectories of the two clamping columns are respectively located on two parallel planes. The parts of the two clamping columns used for clamping the mandrel have an overlap point on the side of their rotation trajectories that are close to each other, and the two clamping columns coincide at the overlap point in each rotation cycle.

[0006] Furthermore, the drive mechanism includes a first crankshaft and two frames. The first crankshaft includes two first main journals and a first connecting rod journal a. The first connecting rod journal a is disposed between the two first main journals and its two ends are fixedly connected to the two first main journals respectively. The two ends of the two first main journals facing away from the first connecting rod journal a are respectively rotatably engaged with the two frames; One of the clamping posts is disposed on and connected to the first connecting rod journal a, and a balancing component for maintaining the balance of the clamping post is provided between the clamping post and the first connecting rod journal a.

[0007] Furthermore, the balancing assembly includes a second crankshaft parallel to the first crankshaft and a connecting rod a. The second crankshaft includes two second main journals and a second connecting rod journal a. The second connecting rod journal a is disposed between the two second main journals and its two ends are fixedly connected to the two second main journals respectively. The two ends of the two second main journals facing away from the second connecting rod journal a are respectively rotatably engaged with the two frames; The connecting rod a is fixedly connected to the clamping column, and the two ends of the connecting rod a are respectively hinged to the first connecting rod journal a and the second connecting rod journal a; The wheelbase between the first main journal and the second main journal is equal to the length of the connecting rod a, and the wheelbase between the first connecting rod journal a and the first main journal is equal to the wheelbase between the second connecting rod journal a and the second main journal.

[0008] Furthermore, the drive mechanism also includes a third crankshaft parallel to the second crankshaft. The third crankshaft includes two third main journals and a third connecting rod journal b. The third connecting rod journal b is disposed between the two third main journals and its two ends are fixedly connected to the two third main journals respectively. The two ends of the two third main journals facing away from the third connecting rod journal b are respectively rotatably engaged with the two frames; Another clamping post is disposed on and connected to the third connecting rod journal b. A linkage assembly is provided between the third crankshaft and the second crankshaft. When the second crankshaft rotates, the linkage assembly drives the third crankshaft to rotate synchronously and in the same direction.

[0009] Furthermore, the wheelbase between the first main journal and the third main journal is less than or equal to the wheelbase between the first connecting rod journal a and the first main journal plus the wheelbase between the third connecting rod journal b and the third main journal.

[0010] Furthermore, the linkage assembly includes a second connecting rod journal b parallel to the second main journal and a connecting rod b, wherein the second connecting rod journal b is fixedly connected to one of the second main journals; The connecting rod b is fixedly connected to the corresponding clamping column, and the two ends of the connecting rod b are respectively hinged to the second connecting rod journal b and the third connecting rod journal b; The wheelbase between the second main journal and the third main journal is equal to the length of the connecting rod b, and the wheelbase between the second connecting rod journal b and the second main journal is equal to the wheelbase between the third connecting rod journal b and the third main journal.

[0011] Furthermore, one end of the clamping column on the connecting rod a is fixedly connected to one end of the connecting rod a facing the first connecting rod journal a, and the other end extends vertically upward; One end of the clamping column on the connecting rod b is fixedly connected to one end of the connecting rod b facing the journal b of the third connecting rod, and the other end extends in the vertical direction, and the two clamping columns have the same structural dimensions.

[0012] Furthermore, a parallel first connecting rod journal c is fixedly connected to one of the first main journals, and a parallel third connecting rod journal c is fixedly connected to one of the third main journals on the same side as the first main journal. A connecting rod c is provided between the first connecting rod journal c and the third connecting rod journal c, and the two ends of the connecting rod c are respectively hinged to the first connecting rod journal c and the third connecting rod journal c; The length of the connecting rod c is equal to the wheelbase between the first main journal and the third main journal, and the wheelbase between the first connecting rod journal c and the first main journal is equal to the wheelbase between the third connecting rod journal c and the third main journal.

[0013] Furthermore, two clamping arms are symmetrically provided at the top of the clamping column. Both clamping arms are slidably connected to the clamping column in the horizontal direction, and the plane of the sliding trajectory is parallel to the plane of the movement trajectory of the clamping column on the frame. The clamping post is provided with a drive unit that drives the two clamping arms to slide synchronously in opposite directions on the clamping post.

[0014] Furthermore, the clamping column has a hollow structure with an open top, and the driving part includes a transmission gear that rotates with the inner two side walls of the clamping column, two first racks that mesh with one end of the transmission gear, and a second rack that meshes with the other end of the transmission gear. The two first racks are respectively located on the upper and lower sides of the transmission gear and are both slidingly engaged with one side wall of the clamping column in the horizontal direction. The two ends of the two clamping arms on the same side are inserted into the clamping column and fixedly connected to the two first racks respectively. The second rack is in a vertical position. The top of the second rack is fixedly connected to a support bar for supporting the spindle, and the bottom is inserted below the two first racks and fixedly connected to a support plate. When the second rack moves downward, the transmission gear pushes the two clamping arms closer together. The support plate slides vertically with the inner wall of the clamping column. An elastic support is provided between the support plate and the bottom wall of the clamping column. When the elastic support is in its natural extended state, the bearing strip protrudes from the top opening of the clamping column and the opening between the two clamping arms is fully open.

[0015] The beneficial effects of this invention are as follows: This invention relates to a double-crank connecting rod structure for clamping mandrels. Two clamping columns are arranged horizontally, with their rotational trajectories overlapping on their closest sides. A drive mechanism propels the two clamping columns to rotate in two vertical planes. When the first clamping column rotates to the position of the mandrel on the production line, it clamps and lifts the mandrel, causing it to rotate together in the corresponding vertical plane, thus achieving horizontal transfer of the mandrel. When the two clamping columns overlap, the mandrel is transferred from the first clamping column to the second, and the second column drives the mandrel to rotate again, continuing its movement along the same horizontal direction until it is transferred to the roller conveyor.

[0016] With a constant horizontal distance between the production line and the roller conveyor, two clamping columns with small swing radii that cooperate with each other can be set between the production line and the roller conveyor to reduce the swing operation space occupied in the vertical direction during the mandrel transfer process.

[0017] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the connecting rod structure in an embodiment of the present invention; Figure 3 This is an exploded view of the connecting rod structure in an embodiment of the present invention; Figure 4 This is a three-dimensional structural diagram of the driving mechanism in an embodiment of the present invention; Figure 5 This is a schematic diagram of the planar structure of the driving mechanism in an embodiment of the present invention (when overlapping); Figure 6 This is a schematic diagram of the planar structure of the drive mechanism in an embodiment of the present invention (when separated); Figure 7 This is a three-dimensional structural diagram of the clamping arm and the driving part in an embodiment of the present invention; Figure 8 This is a three-dimensional structural diagram of the first crankshaft in an embodiment of the present invention; Figure 9 for Figure 1 Enlarged view of point A in the middle.

[0019] In the figure: First crankshaft 1, first main journal 11, first connecting rod journal a12, first connecting rod journal c13, connecting rod a14; Second crankshaft 2, second main journal 21, second connecting rod journal a22, second connecting rod journal b23, connecting rod b24; Third crankshaft 3, third main journal 31, third connecting rod journal b32, third connecting rod journal c33, connecting rod c34; Clamping column 4, clamping arm 41, transmission gear 42, first rack 43, second rack 44, bearing bar 45, support plate 46, spring 47; Frame 51, bearing housing 511, spindle 52, motor 53, drive gear 54, transmission shaft 55, driven gear 56, mounting base 57, production line 58, roller conveyor 59. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the above description of the present invention, it should be noted that the terms "one side," "the other side," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the invention is conventionally placed during use. These terms are used only for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "identical" do not imply that components must be absolutely identical; minor differences are permissible. The term "perpendicular" simply means that the positional relationship between components is more perpendicular than "parallel," not that the structure must be perfectly perpendicular; a slight tilt is acceptable.

[0025] Please see Figure 1-9 The present invention provides a technical solution: a double crank connecting rod structure for clamping a mandrel, comprising two clamping columns 4 arranged in a horizontal direction and a driving mechanism for driving the two clamping columns 4 to rotate in the same direction in a vertical plane. The rotation trajectories of the two clamping columns 4 are respectively located on two parallel planes. The parts of the two clamping columns 4 used for clamping the mandrel 52 have an overlap point on the side of their rotation trajectories that are close to each other, and the two clamping columns 4 coincide at the overlap point in each rotation cycle.

[0026] The production line 58 has multiple hollowed-out gaps along the axial direction of the mandrel 52, with the portion of the mandrel 52 suspended at these gaps. A roller conveyor 59 is located on one side of the production line 58 and mounted on a mounting base 57. Two connecting rod structures are provided, arranged in a linear array along the axial direction of the mandrel 52, and respectively positioned within two hollowed-out gaps in the production line 58. By setting two connecting rod structures and controlling their synchronous operation, two clamping points are established along the axial direction of the mandrel 52 to facilitate clamping and fixing of the mandrel 52, making its transport more stable.

[0027] Two clamping columns 4 are arranged horizontally, with their rotational trajectories overlapping on the side closest to each other. A drive mechanism drives the two clamping columns 4 to rotate in two vertical planes. When the first clamping column 4 rotates to the position of the mandrel 52 on the production line 58, it clamps and lifts the mandrel 52, causing it to rotate together in the corresponding vertical plane, thus achieving the purpose of horizontally transferring the mandrel 52. When the two clamping columns 4 move to overlap, the mandrel 52 is transferred from the first clamping column 4 to the second clamping column 4, and the second clamping column 4 drives the mandrel 52 to rotate again, causing it to continue moving along the same horizontal direction until the mandrel 52 is transferred to the roller conveyor 59.

[0028] With the horizontal distance between production line 58 and roller conveyor 59 remaining constant, two clamping columns 4 with small swing radii and mutual cooperation are set between production line 58 and roller conveyor 59 to reduce the swing operation space occupied in the vertical direction during the transfer of spindle 52.

[0029] In this embodiment: the drive mechanism includes a first crankshaft 1 and two frames 51. The first crankshaft 1 includes two first main journals 11 and a first connecting rod journal a12. The first connecting rod journal a12 is disposed between the two first main journals 11 and its two ends are fixedly connected to the two first main journals 11 respectively. The two ends of the first main journals 11 facing away from the first connecting rod journal a12 are respectively rotatably engaged with the two frames 51; One of the clamping posts 4 is disposed on and connected to the first connecting rod journal a12, and a balancing component for maintaining the balance of the clamping post 4 is provided between the clamping post 4 and the first connecting rod journal a12.

[0030] The top ends of both frames 51 are fixedly connected with bearing seats 511 for mounting the first main journal 11. By inserting the two first main journals 11 into the two bearing seats 511 on the top ends of the two frames 51 and rotating them, the first clamping part is supported from both ends of the first crankshaft 1 to improve the load-bearing strength of the first crankshaft 1, so as to stably lift the transfer spindle 52.

[0031] In this embodiment: the balancing assembly includes a second crankshaft 2 parallel to the first crankshaft 1 and a connecting rod a14. The second crankshaft 2 includes two second main journals 21 and a second connecting rod journal a22. The second connecting rod journal a22 is disposed between the two second main journals 21 and its two ends are fixedly connected to the two second main journals 21 respectively. The two ends of the second main journals 21 facing away from the second connecting rod journal a22 are respectively rotatably engaged with the two frames 51; The connecting rod a14 is fixedly connected to the clamping column 4, and the two ends of the connecting rod a14 are respectively hinged to the first connecting rod journal a12 and the second connecting rod journal a22; The wheelbase between the first main journal 11 and the second main journal 21 is equal to the length of the connecting rod a14, and the wheelbase between the first connecting rod journal a12 and the first main journal 11 is equal to the wheelbase between the second connecting rod journal a22 and the second main journal 21.

[0032] The second crankshaft 2 is located at the bottom of the frame 51. Both frames 51 are fixedly connected with bearing seats 511 for mounting the second main journal 21, and the two second main journals 21 are respectively inserted into the corresponding two bearing seats 511 and rotated together.

[0033] The first crankshaft 1, the second crankshaft 2, the connecting rod a14, and the frame 51 form a parallelogram structure, with the first main journal 11, the first connecting rod journal a12, the second main journal 21, and the second connecting rod journal a22 serving as the four vertices of this parallelogram structure. When the second crankshaft 2 rotates, since the positions of the first main journal 11 and the second main journal 21 on the frame 51 are fixed, the connecting rod a14 becomes a side of the parallelogram structure with a constant inclination angle. Consequently, the inclination angle of the clamping column 4 fixedly connected to the connecting rod a14 remains unchanged, facilitating the smooth lifting of the transfer spindle 52.

[0034] A motor 53 and a drive shaft 55 are provided between the two connecting rod structures. The motor 53 is fixedly mounted on the mounting base 57, and a drive gear 54 is fixedly connected to the output end of the motor 53. Both ends of the drive shaft 55 are coaxially fixedly connected to two opposing second main journals 21 in the two connecting rod structures, thereby connecting the two second crankshafts 2 together and enabling the two connecting rod structures to work synchronously. A drive gear 42 is coaxially fixedly connected to the middle of the drive shaft 55, and the drive gear 42 meshes with the drive gear 54, providing power for the rotation of the drive shaft 55 via the motor 53. The specific model of the motor 53 is: Demark 180M-35015E-E.

[0035] In this embodiment: the drive mechanism further includes a third crankshaft 3 parallel to the second crankshaft 2. The third crankshaft 3 includes two third main journals 31 and a third connecting rod journal b32. The third connecting rod journal b32 is disposed between the two third main journals 31 and its two ends are fixedly connected to the two third main journals 31 respectively. The two ends of the two third main journals 31 facing away from the third connecting rod journal b32 are respectively rotatably engaged with the two frames 51; Another clamping column 4 is disposed on and connected to the third connecting rod journal b32. A linkage component is provided between the third crankshaft 3 and the second crankshaft 2. When the second crankshaft 2 rotates, the linkage component drives the third crankshaft 3 to rotate synchronously and in the same direction.

[0036] The third crankshaft 3 is located at the top of the frame 51, and the third crankshaft 3 is at the same horizontal height as the first crankshaft 1, so that the first crankshaft 1, the second crankshaft 2 and the third crankshaft 3 form a triangular structure. The top of both frames 51 are fixedly connected to bearing seats 511 for mounting the third main journal 31.

[0037] In this embodiment: the wheelbase between the first main journal 11 and the third main journal 31 is less than or equal to the wheelbase between the first connecting rod journal a12 and the first main journal 11 plus the wheelbase between the third connecting rod journal b32 and the third main journal 31.

[0038] When the first crankshaft 1 rotates, the first connecting rod journal a12 rotates around the first main journal 11. The wheelbase between the first connecting rod journal a12 and the first main journal 11 is the radius of rotation. When the third crankshaft 3 rotates, the third connecting rod journal b32 rotates around the third main journal 31. The wheelbase between the third connecting rod journal b32 and the third main journal 31 is the radius of rotation. By setting the wheelbase between the first main journal 11 and the third main journal 31 to be less than or equal to the sum of the wheelbase between the first connecting rod journal a12 and the first main journal 11 and the wheelbase between the third connecting rod journal b32 and the third main journal 31, the rotation trajectory of the first connecting rod journal a12 overlaps with the rotation trajectory of the third connecting rod journal b32.

[0039] In this embodiment: the linkage component includes a second connecting rod journal b23 and a connecting rod b24 that are parallel to the second main journal 21, and the second connecting rod journal b23 is fixedly connected to one of the second main journals 21; The connecting rod b24 is fixedly connected to the corresponding clamping post 4, and the two ends of the connecting rod b24 are respectively hinged to the second connecting rod journal b23 and the third connecting rod journal b32; The wheelbase between the second main journal 21 and the third main journal 31 is equal to the length of the connecting rod b24, and the wheelbase between the second connecting rod journal b23 and the second main journal 21 is equal to the wheelbase between the third connecting rod journal b32 and the third main journal 31.

[0040] The second crankshaft 2, the third crankshaft 3, the connecting rod b24, and the frame 51 form a parallelogram structure, with the second main journal 21, the second connecting rod journal b23, the third main journal 31, and the third connecting rod journal b32 serving as the four vertices of this parallelogram structure. When the second crankshaft 2 rotates, since the positions of the second main journal 21 and the third main journal 31 on the frame 51 are fixed, the connecting rod b24 becomes a side of the parallelogram structure with a constant inclination angle. This ensures that the inclination angle of the clamping column 4 fixedly connected to the connecting rod b24 remains constant, facilitating the smooth lifting of the transfer mandrel 52. Simultaneously, when the second crankshaft 2 rotates, the second connecting rod journal a22 drives the connecting rod a14 to move, thereby linking the first crankshaft 1, the second crankshaft 2, and the third crankshaft 3 together.

[0041] In this embodiment: one end of the clamping column 4 on the connecting rod a14 is fixedly connected to one end of the connecting rod a14 facing the first connecting rod journal a12, and the other end extends vertically upward; One end of the clamping post 4 on the connecting rod b24 is fixedly connected to one end of the connecting rod b24 facing the third connecting rod journal b32, and the other end extends in the vertical direction, and the two clamping posts 4 have the same structural dimensions.

[0042] By fixing the clamping post 4 on the connecting rod a14 to the end of the connecting rod a14 facing the first connecting rod journal a12, and fixing the end of the clamping post 4 on the connecting rod b24 to the end of the connecting rod b24 facing the third connecting rod journal b32, since the paths of the first connecting rod journal a12 and the third connecting rod journal b overlap, when the first connecting rod journal a12 and the third connecting rod journal b overlap, since the structural dimensions of the two clamping posts 4 are the same, the two clamping posts 4 overlap, and the transmission spindle 52 works.

[0043] By pre-setting the two clamping posts 4 to overlap, since the first crankshaft 1, the second crankshaft 2 and the third crankshaft 3 rotate synchronously, at the same speed and in the same direction, only the second crankshaft 2 needs to be applied with rotational force. After the second crankshaft 2 rotates one revolution, the two clamping posts 4 will automatically return to their initial positions and automatically overlap to perform the work of transmitting the spindle 52.

[0044] In this embodiment: a first connecting rod journal c13 parallel to the first main journal 11 is fixedly connected to one of the first main journals 11, and a third connecting rod journal c33 parallel to the first main journal 11 is fixedly connected to one of the third main journals 31 on the same side. A connecting rod c34 is provided between the first connecting rod journal c13 and the third connecting rod journal c33, and the two ends of the connecting rod c34 are respectively hinged to the first connecting rod journal c13 and the third connecting rod journal c33. The length of the connecting rod c34 is equal to the wheelbase between the first main journal 11 and the third main journal 31, and the wheelbase between the first connecting rod journal c13 and the first main journal 11 is equal to the wheelbase between the third connecting rod journal c33 and the third main journal 31.

[0045] The parallelogram structure consists of a first crankshaft 1, a third crankshaft 3, a connecting rod c34, and a frame 51, with the first main journal 11, the first connecting rod journal c13, the third main journal 31, and the third connecting rod journal c33 serving as the four vertices of this parallelogram structure. The connecting rod c34 connects the first crankshaft 1 and the third crankshaft 3 together, improving their strength and stability. Simultaneously, the connecting rod c34 directly links the rotation of the first crankshaft 1 and the third crankshaft 3, making the transmission between the first crankshaft 1, the second crankshaft 2, and the third crankshaft 3 more stable.

[0046] In this embodiment: two clamping arms 41 are symmetrically provided at the top of the clamping column 4. Both clamping arms 41 are slidably connected to the clamping column 4 in the horizontal direction, and the plane of the sliding trajectory is parallel to the plane of the movement trajectory of the clamping column 4 on the frame 51. The clamping column 4 is provided with a driving part that drives the two clamping arms 41 to slide synchronously in opposite directions on the clamping column 4.

[0047] In this embodiment: the clamping column 4 has a hollow structure with an open top, and the driving part includes a transmission gear 42 that rotates with the inner two side walls of the clamping column 4, two first racks 43 that mesh with one end of the transmission gear 42, and a second rack 44 that meshes with the other end of the transmission gear 42; The two first racks 43 are respectively located on the upper and lower sides of the transmission gear 42 and are both slidably engaged with one side wall of the clamping column 4 in the horizontal direction. The two ends of the two clamping arms 41 on the same side are inserted into the clamping column 4 and are fixedly connected to the two first racks 43 respectively. The second rack 44 is in a vertical state. The top end of the second rack 44 is fixedly connected to a support bar 45 for supporting the spindle 52, and the bottom end is inserted below the two first racks 43 and fixedly connected to a support plate 46. When the second rack 44 moves downward, the transmission gear 42 pushes the two clamping arms 41 closer together. The support plate 46 slides vertically with the inner wall of the clamping column 4. An elastic support is provided between the support plate 46 and the inner bottom wall of the clamping column 4. When the elastic support is in its natural extended state, the bearing strip 45 protrudes from the top opening of the clamping column 4 and the opening between the two clamping arms 41 is fully open.

[0048] The elastic support is a spring 47. One end of the spring 47 is fixedly connected to the inner bottom surface of the clamping column 4, and the other end is fixedly connected to the support plate 46. The spring 47 provides flexible support for the support plate 46, the second rack 44, and the bearing bar 45.

[0049] like Figure 5 As shown, the two clamping columns 4 are in an overlapping state. During use, when the spindle 52 on the production line 58 needs to be transferred to the roller conveyor 59, the motor 53 is started. The output end of the motor 53 drives the transmission shaft 55 to rotate through the drive gear 54 and the driven gear 56, so that the transmission shaft 55 drives the two second crankshafts 2 to rotate, and then the two connecting rod structures operate synchronously to work. Under the combined action of connecting rods a14, b24, and c34, the first crankshaft 1 and the third crankshaft 3 rotate at the same speed and in the same direction as the second crankshaft 2. Consequently, the clamping column 4 on connecting rod a14 rotates downward and then approaches the spindle 52. When the top of the clamping column 4 moves to below the spindle 52, the clamping column 4 continues to move. The bearing strip 45 on the clamping column 4 comes into contact with the spindle 52. Under the action of the gravity of the spindle 52, the bearing strip 45 pushes the second rack 44 to slide downward into the clamping column 4. The support plate 46 compresses the spring 47, and the spring 47 contracts to store energy, causing the transmission gear 42 to rotate in the forward direction. The transmission gear 42 then drives the two clamping arms 41 to slide horizontally and approach each other through the two first racks 43 until the two clamping arms 41 clamp and fix the spindle 52, thereby achieving the purpose of automatically clamping and fixing the spindle 52.

[0050] The connecting rod a14 drives the clamping column 4 and the spindle 52 to rotate upward and move towards the roller conveyor 59. When the two clamping columns 4 are about to overlap, the clamping column 4 on the connecting rod a14 drives the spindle 52 to move downward, and the clamping column 4 on the connecting rod b24 moves upward. Then, during the process of the two clamping columns 4 overlapping and then separating, the clamping column 4 on the connecting rod b24 moves upward. The bearing bar 45 in the clamping column 4 on the connecting rod b24 contacts the spindle 52 and is gradually pressed into the corresponding clamping column 4, so that the corresponding spring 47 is compressed and stores energy, and then the corresponding two clamping arms 41 perform clamping and fixing work on the spindle 52.

[0051] At the same time, the pressure of the mandrel 52 on the clamping post 4 on the connecting rod a14 gradually decreases until it disappears. The spring 47 in the clamping post 4 on the connecting rod a14 releases energy and extends freely, causing the two clamping arms 41 on the clamping post 4 to move away from each other and cancel the clamping of the mandrel 52. Then, the clamping post 4 on the connecting rod b24 carries the mandrel 52 upward, completing the transfer of the mandrel 52 between the two clamping posts.

[0052] When the clamping column 4 on the connecting rod b24 moves the spindle 52 to the target position on the roller conveyor 59, the spindle 52 contacts the roller conveyor 59. The connecting rod b24 drives the clamping column 4 to move downward, and the spindle 52 is placed on the roller conveyor 59. The pressure of the spindle 52 on the clamping column 4 on the connecting rod b24 decreases, causing the corresponding spring 47 to release energy and extend freely. As a result, the corresponding bearing bar 45 protrudes from the opening of the clamping column 4, and the two clamping arms 41 move away from each other to eliminate the clamping of the spindle 52, thus completing the transfer of the spindle 52.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A double-crank connecting rod structure for clamping a mandrel, characterized in that: It includes two clamping columns (4) arranged in the horizontal direction and a driving mechanism for driving the two clamping columns (4) to rotate in the same direction in the vertical plane. The rotation trajectories of the two clamping columns (4) are respectively located on two parallel planes. The parts of the two clamping columns (4) used to clamp the mandrel (52) have an overlap point on the side of their rotation trajectories that are close to each other, and the two clamping columns (4) coincide at the overlap point in each rotation cycle. The drive mechanism includes a first crankshaft (1) and two frames (51). The first crankshaft (1) includes two first main journals (11) and a first connecting rod journal a (12). The first connecting rod journal a (12) is located between the two first main journals (11) and its two ends are fixedly connected to the two first main journals (11) respectively. The two ends of the first main journals (11) facing away from the first connecting rod journal a (12) are respectively rotatably engaged with the two frames (51); One of the clamping posts (4) is disposed on and connected to the first connecting rod journal a (12), and a balancing component for maintaining the balance of the clamping post (4) is provided between the clamping post (4) and the first connecting rod journal a (12); The balancing assembly includes a second crankshaft (2) parallel to the first crankshaft (1) and a connecting rod a (14). The second crankshaft (2) includes two second main journals (21) and a second connecting rod journal a (22). The second connecting rod journal a (22) is located between the two second main journals (21) and its two ends are fixedly connected to the two second main journals (21) respectively. The two ends of the two second main journals (21) facing away from the second connecting rod journal a (22) are respectively rotatably engaged with the two frames (51); The connecting rod a (14) is fixedly connected to the clamping column (4), and the two ends of the connecting rod a (14) are respectively hinged to the first connecting rod journal a (12) and the second connecting rod journal a (22); The wheelbase between the first main journal (11) and the second main journal (21) is equal to the length of the connecting rod a (14), and the wheelbase between the first connecting rod journal a (12) and the first main journal (11) is equal to the wheelbase between the second connecting rod journal a (22) and the second main journal (21). The drive mechanism also includes a third crankshaft (3) parallel to the second crankshaft (2). The third crankshaft (3) includes two third main journals (31) and a third connecting rod journal b (32). The third connecting rod journal b (32) is located between the two third main journals (31) and its two ends are fixedly connected to the two third main journals (31) respectively. The two ends of the two third main journals (31) facing away from the third connecting rod journal b (32) are respectively rotatably engaged with the two frames (51); Another clamping column (4) is disposed on and connected to the third connecting rod journal b (32). A linkage assembly is provided between the third crankshaft (3) and the second crankshaft (2). When the second crankshaft (2) rotates, the linkage assembly drives the third crankshaft (3) to rotate synchronously and in the same direction. The linkage assembly includes a second connecting rod journal b (23) parallel to the second main journal (21) and a connecting rod b (24), wherein the second connecting rod journal b (23) is fixedly connected to one of the second main journals (21); The connecting rod b (24) is fixedly connected to the corresponding clamping column (4), and the two ends of the connecting rod b (24) are respectively hinged to the second connecting rod journal b (23) and the third connecting rod journal b (32); The wheelbase between the second main journal (21) and the third main journal (31) is equal to the length of the connecting rod b (24), and the wheelbase between the second connecting rod journal b (23) and the second main journal (21) is equal to the wheelbase between the third connecting rod journal b (32) and the third main journal (31).

2. The double-crank connecting rod structure for clamping a mandrel according to claim 1, characterized in that: The wheelbase between the first main journal (11) and the third main journal (31) is less than or equal to the wheelbase between the first connecting rod journal a (12) and the first main journal (11) plus the wheelbase between the third connecting rod journal b (32) and the third main journal (31).

3. The double-crank connecting rod structure for clamping a mandrel according to claim 1, characterized in that: One end of the clamping column (4) on the connecting rod a (14) is fixedly connected to one end of the connecting rod a (14) facing the first connecting rod journal a (12), and the other end extends vertically upward; One end of the clamping column (4) on the connecting rod b (24) is fixedly connected to one end of the connecting rod b (24) facing the third connecting rod journal b (32), and the other end extends in the vertical direction. The two clamping columns (4) have the same structural dimensions.

4. The double-crank connecting rod structure for clamping a mandrel according to claim 1, characterized in that: One of the first main journals (11) is fixedly connected to a parallel first connecting rod journal c (13), and a parallel third connecting rod journal c (33) is fixedly connected to a third main journal (31) on the same side as the first main journal (11). A connecting rod c(34) is provided between the first connecting rod journal c(13) and the third connecting rod journal c(33), and the two ends of the connecting rod c(34) are respectively hinged to the first connecting rod journal c(13) and the third connecting rod journal c(33); The length of the connecting rod c (34) is equal to the wheelbase between the first main journal (11) and the third main journal (31), and the wheelbase between the first connecting rod journal c (13) and the first main journal (11) is equal to the wheelbase between the third connecting rod journal c (33) and the third main journal (31).

5. The double-crank connecting rod structure for clamping a mandrel according to claim 1, characterized in that: The clamping column (4) is symmetrically provided with two clamping arms (41) at its top. Both clamping arms (41) are slidably connected to the clamping column (4) in the horizontal direction, and the plane of the sliding trajectory is parallel to the plane of the movement trajectory of the clamping column (4) on the frame (51). The clamping post (4) is provided with a drive unit that drives the two clamping arms (41) to slide synchronously in opposite directions on the clamping post (4).

6. The double-crank connecting rod structure for clamping a mandrel according to claim 5, characterized in that: The clamping column (4) has a hollow structure with an open top. The driving part includes a transmission gear (42) that rotates with the inner two side walls of the clamping column (4), two first racks (43) that mesh with one end of the transmission gear (42), and a second rack (44) that meshes with the other end of the transmission gear (42). The two first racks (43) are respectively located on the upper and lower sides of the transmission gear (42) and are both slidingly engaged with one side wall of the clamping column (4) in the horizontal direction. The two ends of the two clamping arms (41) on the same side are inserted into the clamping column (4) and fixedly connected to the two first racks (43) respectively. The second rack (44) is in a vertical state. The top end of the second rack (44) is fixedly connected to a support bar (45) for supporting the spindle (52), and the bottom end is inserted below the two first racks (43) and fixedly connected to a support plate (46). When the second rack (44) moves downward, the transmission gear (42) pushes the two clamping arms (41) to move closer and converge. The support plate (46) slides vertically with the inner wall of the clamping column (4). An elastic support is provided between the support plate (46) and the inner bottom wall of the clamping column (4). When the elastic support is in its natural extended state, the bearing strip (45) protrudes from the top opening of the clamping column (4) and the opening between the two clamping arms (41) is fully open.

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