Mandrel automatic circulation machine for pipe drawing and operation method thereof

Abstract

The present invention relates to a core head automatic circulation machine for pipe drawing and an operation method thereof, comprising a support frame, the support frame is provided with a ratchet disc assembly, a primary orientation mechanism, a secondary orientation mechanism and a slide rail, the ratchet disc assembly comprises a ratchet disc core and a ratchet disc ring, the ratchet disc core is used to receive the core head after drawing, the ratchet disc ring stores a plurality of core heads, and the ratchet disc ring can convey the core head to the primary orientation mechanism, the primary orientation mechanism comprises a V-shaped flap and a centering device, the secondary orientation mechanism comprises a centering plate and a commutator, the V-shaped flap is used to receive the core head falling off from the ratchet disc ring, the centering device is used to clamp the core head in the V-shaped flap, after the centering device releases the core head, the center line of the core head in the length direction falls on the centering plate, and the large head of the core head falls on the commutator at the same time, and the commutator makes the large head of the core head fall downward into the slide rail. The present invention can realize the preparation, selection and recycling of the core head.

Description

Technical Field

[0001] The invention relates to the technical field of tube drawing, and in particular to a core head automatic circulation machine for tube drawing and an operation method thereof. Background Art

[0002] One of the methods to obtain the corresponding products by changing the shape and size of metal materials without cutting. This process is suitable for mass production of long strip metal materials with relatively simple cross-sectional shapes (such as pipes, round bars, square bars, hexagonal bars, etc.). It has high processing efficiency and processing accuracy and is widely used. Cold drawing of metal pipes is one of them. The principle is: the mold consists of an outer mold and an inner mold (generally called a core head in the industry). The outer diameter of the material is determined by the outer mold, and the inner diameter is determined by the core head, so the wall thickness is also determined (that is, half of the difference between the inner and outer diameters). During drawing, fill the inner hole of the pipe with internal lubricating oil in advance, and then install the core head (the core head is divided into large and small heads, with a transition in the middle cone section. When installing, the large head is installed inward), and then the head is made (the upper section of the pipe on the head is pressed smaller and compacted to facilitate passing through the outer die and being clamped by the guide clamp), and then it is passed through the drawing outer die fixed on the equipment, and is pulled by the drawing main machine to force it through the convergent inner hole of the outer die to reduce its outer diameter. At the same time, the core head is fixed in the inner hole of the pipe by its small head and cone section. Since the forward friction force of the core head against the pipe wall will eventually reach a mechanical equilibrium with the backward force generated by the cone section, the position of the core head will always remain in the material deformation zone without being taken away, and the small head straight section is embedded in the position of the outer die straight section to prevent the inner hole diameter of the pipe from changing freely, so as to ensure the dimensional accuracy of the inner hole.

[0003] Existing drawing machines such as Figure 1 As shown, it includes a drawing main machine 1, a material basket circulation system 4 and a drawing die 8. The material basket circulation system 4 is provided with a material receiving station 2, a material preparation station 6, a material discharge station 7 and a plurality of other intermediate stations 3. Since the drawn material 9 needs to be drawn multiple times from the blank to the finished product, according to its production characteristics, the equipment is a multi-station circulation work. The material basket circulation system 4 is a closed circumferential circulation system with a plurality of stations. Each station has a circular material basket 5. The material is placed in the material basket in the form of multiple turns (ranging from dozens to thousands of turns). One of the material baskets is an empty material basket, and the other material baskets contain materials. The functions of the three main stations are briefly described as follows:

[0004] The receiving station 2 and the drawing main machine 1 are at the same position, which is the upstream and downstream dividing point of the drawing cycle process. Before the drawing starts, the empty material basket waits here to receive the drawn material;

[0005] The material discharge station 7 is located upstream, and the material is discharged from here to pass through the die for drawing. After all the materials have passed through the die, the material basket is empty;

[0006] The function of the material preparation station 6 is for workers to straighten, lubricate, install the core head, make the head and other preparatory work (called material preparation) before drawing to avoid waiting time in the middle;

[0007] When a basket of materials is pulled out, the basket circulation system 4 is started, and all baskets 5 move forward one station at the same time. Correspondingly, the empty baskets on the discharge position are moved to the receiving position, and the baskets (with materials) on the preparation position are moved to the discharge position, completing a station conversion.

[0008] When the materials in all the baskets (usually 7 baskets) have been drawn, one drawing pass is completed. At this time, a smaller mold should be replaced for the next cycle (i.e. the next drawing pass), and this cycle is repeated until the drawn material reaches the finished product size.

[0009] Within one pass, the outer mold of the drawing die 8 is installed on the equipment and no operation is required; the core head of the drawing die 8 is placed in the tube and is installed once for each basket of materials. In order to reduce the number of core heads while taking into account production efficiency, the industry generally uses two core heads of the same size for rotation. When one core head is in use for drawing, the other core head is loaded and prepared at the material preparation position. After the materials are prepared, it enters a waiting state. After the materials on the material placement position are pulled out, the work station is immediately switched for drawing. After a basket of materials is pulled out, the core head in the tube will fall to a fixed position, and the worker needs to take it out, such as Figure 1 As shown, the material is taken from point A to the preparation position at point B for the next preparation, and this cycle is repeated over and over again. Therefore, the cyclic operation of the core head needs to be completed manually.

[0010] In order to reduce labor costs and improve production efficiency, more and more companies hope to make drawing machines fully automated. At present, they can automatically complete straightening, lubrication, head making and other tasks. However, the preparation, recovery and recycling of core heads have become a difficult problem to promote the overall automation of drawing machines, which needs to be solved urgently. Summary of the invention

[0011] In order to overcome the above defects, the present invention provides an automatic core head circulation machine for pipe drawing, which can realize the core head preparation, selection and recycling cycle to cooperate with automatic head making and automatic material threading, thereby realizing the automation of the entire equipment.

[0012] The technical solution adopted by the present invention to solve its technical problem is:

[0013] The cam is used to move the core head from one end of the tube to the other end of the tube, and the cam is used to move the core head from one end of the tube to the other end of the tube.

[0014] Preferably, a base is fixedly provided on the support frame, the ratchet core is fixed on the base, the primary orienting mechanism and the secondary orienting mechanism are located below the base, the ratchet ring is sleeved on the outer ring of the ratchet core, a circulation oblique cavity and a recovery oblique cavity are provided on the ratchet core, a plurality of storage cavities that are evenly distributed and separated from each other are provided around the ratchet ring, the circulation oblique cavity and the recovery oblique cavity are respectively connected to different storage cavities, a cover plate is provided above the ratchet ring, a bottom plate is provided below the cover plate, a leakage hole is provided on the bottom plate, the leakage hole is connected to a storage cavity, and the leakage hole is located above the V-shaped flap.

[0015] Preferably, a fixing frame is fixed on the base, a second driving cylinder and a second gear rod are fixed on the fixing frame, the piston rod of the second driving cylinder is fixedly connected to the first gear rod, the first gear rod is located directly above the recovery oblique chamber, the second gear rod is located directly above the circulation oblique chamber, the bottoms of the circulation oblique chamber and the recovery oblique chamber are arranged inclined, and the low point of the bottom is connected to the storage chamber.

[0016] Preferably, at least one ratchet disc driving mechanism is provided on the base, and the ratchet disc driving mechanism includes a first driving cylinder and a pawl fixedly connected to the piston rod of the first driving cylinder, and the first driving cylinder can drive the pawl to drive the ratchet disc to rotate, and the outer ring of the ratchet disc is provided with a plurality of evenly distributed ratchet teeth, and the pawl is inserted into the ratchet groove when extended.

[0017] Preferably, the V-shaped flap is composed of two plates, and when the lower ends of the two plates are fitted together, a V-shaped flap with a V-shaped groove is formed. The V-shaped flap is controlled to open and close by a V-shaped flap driving mechanism. The centering device includes a clamping cylinder and a centering plate. The two clamping claws on the clamping cylinder respectively fix a pair of centering plates. The clamping claw cylinder can drive the centering plate to move and clamp or loosen the core head in the V-shaped flap. The centering plate is located directly below the center position between the two centering plates.

[0018] Preferably, the V-shaped flap driving mechanism includes a third driving cylinder, a first connecting member and a second connecting member, the third driving cylinder is fixed on the support frame, the piston rod of the third driving cylinder is fixedly connected to the driving member, one end of the first connecting member is rotatably connected to the driving member through a connecting shaft, and the other end of the first connecting member is rotatably connected to the second connecting member through a connecting shaft, the first connecting member is fixedly connected to a plate in the V-shaped flap through a fixed shaft, and the second connecting member is fixedly connected to another plate in the V-shaped flap through a fixed shaft.

[0019] Preferably, the commutator is composed of a baffle and a slide plate, a baffle is provided on each side of the slide plate, the center plate is located at the center of the two baffles, and the slide plate is connected to the slide rail.

[0020] Preferably, the slide plate is arranged obliquely, and the low point of the slide plate is connected to the slide rail, the slide rail is arranged obliquely and a V-shaped groove is provided on the slide rail, and the top of the dividing plate is provided with an inclined surface of an inverted "V"-shaped structure.

[0021] The present invention also provides an operation method of a core head automatic circulation machine for pipe drawing, the steps are as follows:

[0022] Step 1: When the drawing of the drawing material in a material basket of a material discharge station is completed, the core head of the drawing die falls off at A, and the core head is transported to B by the core head conveying swing arm. If the material basket to be drawn is in the same pass as the drawn material basket at this time, the core head does not need to be replaced, and the process proceeds to step 2. If the materials of the same pass have been drawn once at this time, the core head needs to be replaced, and the process proceeds to step 3;

[0023] Step 2: The first baffle is retracted, and the second baffle opens the core head conveying swing arm, so that the core head in the swing arm falls into the circulating inclined cavity of the ratchet disc core, and the core head slides down along the inclined bottom of the circulating inclined cavity to the storage cavity connected to the circulating inclined cavity, and enters the V-shaped flap through the leak hole, and then goes to step 4;

[0024] Step 3: The first baffle rod is extended under the action of the second driving cylinder, triggering the front baffle of the core head conveying swing arm in advance, so that the core head in the swing arm falls into the recovery material chamber, and the core head rolls down along its inclined bottom into a corresponding storage chamber to complete the recovery, and this core head no longer participates in the circulation; at the same time, the ratchet disc rotates one grid under the action of the first driving cylinder, pushing the core head pre-arranged in the storage chamber closest to the leak hole into the leak hole, and the core head enters the V-shaped flap, and enters step 4;

[0025] Step 4: After the core head falls into the V-shaped flap, the core head is placed horizontally in the V-shaped flap under the action of the V-shaped flap and gravity, and the clamping claw cylinder drives the centering plate to clamp the core head;

[0026] Step 5: The clamping cylinder releases the core head, and at the same time, the V-shaped flap is opened under the action of the third driving cylinder, so that the core head falls and the center line of the core head in the length direction falls onto the centering plate;

[0027] Step six: The core head falls toward the big end side under the action of gravity. When the big end of the core head falls and contacts the inclined slide board, the big end of the core head slides to the lower part of the slide board, then slides into the slide rail, and slides down along the V-shaped slide rail. That is, the core head slides out of the slide rail with the big end facing downward.

[0028] The beneficial effects of the present invention are as follows: the present invention mainly comprises a ratchet disc assembly, a primary orienting mechanism, a secondary orienting mechanism and a slide rail, and the functions of the circulation machine are: first, the recovery and automatic selection of core heads, and second, the automatic orientation of core heads, wherein the ratchet disc assembly is used to recover core heads that have just been used and to store a plurality of core heads of different specifications in advance in sequence, and if a core head that has just been used needs to be recycled, the ratchet disc assembly conveys the core head to the primary orienting mechanism, and if a core head needs to be replaced, the ratchet disc assembly recovers the core head and no longer uses it, and conveys the core head stored in the ratchet disc core to the primary orienting mechanism, that is, the ratchet disc assembly completes the recovery and automatic selection of the core head; when the core head falls from the ratchet disc ring to the V-shaped flap of the primary orienting mechanism, under the action of the V-shaped flap and gravity, the core head is finally placed horizontally in the V-shaped flap, and the core head is clamped by a centering device so that the center line of the core head in the length direction is located at the dividing mechanism. The core head is positioned just above the middle plate. After the centering device and the core head are released, the core head falls from the V-shaped flap, and the center line of the core head in the length direction falls on the dividing plate. Under the action of its gravity, the big end of the core head falls downward on the commutator, and under the action of the commutator, the big end of the core head falls downward into the slide rail to complete the orienting operation of the core head. Therefore, the ratchet disk assembly in this circulation machine can recycle the used core heads, and send the used core heads or the core heads in the ratchet disk assembly into the primary orienting mechanism, and use the primary orienting mechanism to determine the center line of the core head in the length direction, and then use the secondary orienting mechanism to make the core head always slide out of the slide rail with the big end facing down to cooperate with the work of the grasping mechanism. With the cooperation of this circulation machine, there is no need to manually transfer and replace the core heads during the multiple cycle processing of a batch of products, which makes it possible for the drawing machine to realize the automation of the entire system, which is of great significance to the automation of the drawing system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a prior art drawing system;

[0030] Figure 2 It is a structural schematic diagram of the present invention applied to a drawing system;

[0031] Figure 3 It is a structural schematic diagram of the present invention;

[0032] Figure 4 for Figure 3 Enlarged view of point C in the middle;

[0033] Figure 5 Another structural schematic diagram of the present invention;

[0034] Figure 6 It is a schematic diagram of the structure of some components in the present invention;

[0035] Figure 7 It is a schematic diagram of the core head of the present invention being placed on a V-shaped flap;

[0036] Figure 8 for Figure 7 A top view of

[0037] Fig. 9 It is a schematic diagram of the core head falling on the centering plate in the present invention;

[0038] Fig.10 Another schematic diagram of the core head falling on the centering plate in the present invention;

[0039] In the figure: 1-drawing machine, 2-material receiving station, 3-intermediate station, 4-basket circulation system, 5-basket, 6-material preparation station, 7-material discharge station, 8-drawing die, 9-drawing material,

[0040] 100-circulation machine, 200-automatic threading device, 300-core head conveying swing arm, 400-automatic head making machine,

[0041] 10-support frame, 11-base, 12-first drive cylinder, 13-pawl, 14-fixed frame, 15-first gear lever, 16-second drive cylinder, 17-second gear lever,

[0042] 20-ratchet disc assembly, 21-ratchet disc ring, 22-ratchet disc core, 23-bottom plate, 24-cover plate, 25-storage chamber, 26-circulation oblique chamber, 27-recovery oblique chamber, 28-leak hole,

[0043] 30-primary orientation mechanism, 31-V-shaped flap, 32-third driving cylinder, 33-driving member, 34-first connecting member, 35-second connecting member, 36-fixed shaft, 37-connecting shaft, 38-gripping cylinder, 39-centering plate,

[0044] 40-secondary orientation mechanism, 41-center plate, 42-inclined surface, 43-commutator, 44-baffle, 45-slide plate, 46-slide rail, 47-core head. DETAILED DESCRIPTION

[0045] The following will be combined with 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 making creative work are within the scope of protection of the present invention.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0048] Example: Figure 2-10As shown, a core head automatic circulation machine for pipe drawing includes a support frame 10, on which a ratchet disc assembly 20, a primary orientation mechanism 30, a secondary orientation mechanism 40 and a slide rail 46 are provided. The ratchet disc assembly 20 includes a ratchet disc core 22 fixed to the support frame 10 and a ratchet disc ring 21 that can rotate around the ratchet disc core. The ratchet disc core 22 is used to receive a core head 47 that has been drawn and transport the core head 47 to the ratchet disc ring 21. The ratchet disc ring 21 stores a plurality of core heads 47, and the ratchet disc ring 21 can transport the core head 47 to the primary orientation mechanism 30. The primary orienting mechanism 30 includes a V-shaped flap 31 and a centering device, and the secondary orienting mechanism 40 includes a centering plate 41 and a commutator 43. The V-shaped flap 31 is used to receive the core head 47 that falls off from the ratchet disc 21, and the centering device is used to clamp the core head 47 in the V-shaped flap 31 and make the center line of the core head 47 in the length direction be located directly above the centering plate 41. After the centering device releases the core head 47, the center line of the core head 47 in the length direction falls on the centering plate 41, and at the same time, the large end of the core head 47 falls on the commutator 43, and the commutator 43 makes the large end of the core head 47 fall into the slide rail 46 downward.

[0049] As shown in Figure 2, the circulation machine 100 can cooperate with the automatic head making machine 400 and the automatic threading device 200 to realize the automation of the entire drawing system, so that the drawing system can run automatically for a long time without the operator. The core head conveying swing arm 300 in the figure (this device does not belong to the content of the circulation machine, so it is not introduced in detail) is used to convey the just used core head 47 from A to B. The circulation machine is used to recycle the used core heads and convey the recycled core heads or new core heads out of the slide rail 46 with the big head facing down for subsequent grasping mechanism to grasp; therefore, the functions of the circulation machine are: first, the recovery and automatic selection of core heads, and second, the automatic orientation of core heads (all slide out of the slide rail with the big head facing down). The ratchet disc assembly 20 is used to recycle the core head that has just been used. If the core head that has just been used needs to be recycled, the ratchet disc assembly 20 will transport the core head to the primary orientation mechanism 30. If the core head needs to be replaced, the ratchet disc assembly 20 will recycle the core head and no longer use it. The core head stored in the ratchet disc ring 21 is transported to the primary orientation mechanism 30. When the core head falls off the V-shaped flap of the primary orientation mechanism, the core head is finally placed horizontally in the V-shaped flap 31 under the action of the V-shaped flap and gravity, and the core head clamp is clamped by the centering device. Tighten the core head so that the center line of the length direction of the core head is located directly above the dividing plate 41, completing the first orientation operation of the core head. However, at this time, the direction in which the core head's large end faces has not yet been determined. When the centering device and the V-shaped flap release the core head 47, the core head falls from the V-shaped flap, and the center line of the length direction of the core head 47 falls on the dividing plate 41. Because the large end is heavier than the small end, under the action of its gravity, the large end of the core head 47 falls downward on the commutator 43, and under the action of the commutator 43, the large end of the core head 47 falls downward into the slide rail 46, completing the secondary orientation operation of the core head. Therefore, the ratchet disk assembly in this circulation machine can recycle the used core heads, and send the used core heads or the core heads in the ratchet disk assembly into the primary orientation mechanism, use the primary orientation mechanism to determine the center line of the length direction of the core head, and then use the secondary orientation mechanism to make the core head always slide out of the slide rail with the large end facing downward, to cooperate with the work of the grabbing mechanism, so that it is possible for the drawing machine to realize the automation of the entire system.

[0050] like Figure 3As shown, a base 11 is fixedly provided on the support frame 10, the ratchet core 22 is fixed on the base 11, the primary orienting mechanism 30 and the secondary orienting mechanism 40 are located below the base 11, the ratchet disc 21 is sleeved on the outer ring of the ratchet disc 22, a circulating oblique cavity 26 and a recovering oblique cavity 27 are provided on the ratchet disc 22, a plurality of storage cavities 25 which are evenly distributed and separated from each other are provided around the ratchet disc 21, the circulating oblique cavity 26 and the recovering oblique cavity 27 are respectively connected to different storage cavities 25, a cover plate 24 is provided above the ratchet disc 21, a bottom plate 23 is provided below the cover plate 24, a leak hole 28 is provided on the bottom plate 23, the leak hole 28 is connected to a storage cavity 25, and the leak hole 28 is located above the V-shaped flap 31. The storage cavity 25 is used to store core heads. When preparing for production, core heads of different sizes are arranged in each storage cavity smoothly according to the process. Except for the storage cavity corresponding to the leakage hole 28, the core heads in other storage cavities are supported by the bottom plate 23. The leakage hole 28 is located directly above the V-shaped flap 31. Therefore, the core head falling from the leakage hole just falls on the V-shaped flap 31. The core head comes from the circulation inclined cavity 26 or the storage cavity where the core head is placed in advance.

[0051] A fixing frame 14 is fixed on the base 11, and a second driving cylinder 16 and a second baffle rod 17 are fixed on the fixing frame 14. The piston rod of the second driving cylinder 16 is fixedly connected to the first baffle rod 15. The first baffle rod 15 is located directly above the recovery oblique chamber 27, and the second baffle rod 17 is located directly above the circulation oblique chamber 26. The bottoms of the circulation oblique chamber 26 and the recovery oblique chamber 27 are arranged inclined, and the low point of the bottom is connected to the storage chamber 25. The second driving cylinder 16 is horizontally fixed to the fixed frame 14. The second driving cylinder 16 can drive the first gear rod 15 to move forward and backward. The drawn material must be drawn multiple times by core heads from large to small to obtain the drawn material of the required diameter. After each basket of materials is pulled, the core head will fall off. Before each drawing, the core head will be loaded. There are two sources of the loaded core head 47. The first is: when only one basket of materials is changed in the same pass, there is no need to change the core head model. The core head comes from the core head transported back from A by the core head conveying swing arm 300; the second is: when all the materials in a pass have been pulled once and the pass needs to be changed, a different core head model needs to be replaced. The core head comes from the storage cavity of the ratchet disc arranged in advance according to the process sequence. When the core head source is the first type, the first baffle rod 15 retracts, and the second baffle rod 17 opens the core head conveying swing arm 300, so that the core head 47 in the swing arm falls into the circulation inclined chamber 26, and the core head slides down along the inclined bottom of the circulation inclined chamber to the storage chamber 25 connected to the circulation inclined chamber, and enters the V-shaped flap 31 through the leak hole 28 for recycling; when the core head source is the second type, the first baffle rod 15 extends out under the action of the second driving cylinder 16, triggering the front baffle of the core head conveying swing arm 300 in advance, so that the core head in the swing arm falls into the recovery material chamber 27, and the core head rolls down along its inclined bottom into a corresponding storage chamber to complete the recycling, and this core head no longer participates in the circulation; at the same time, the ratchet disc 21 rotates one grid (such as Figure 5 As shown), the core head arranged in advance in the front storage cavity 25 is pushed into the leak hole 28, and the core head enters the V-shaped flap 31 for use.

[0052] At least one ratchet disc driving mechanism is provided on the base 11, and the ratchet disc driving mechanism includes a first driving cylinder 12 and a pawl 13 fixedly connected to the piston rod of the first driving cylinder. The first driving cylinder 12 can drive the pawl 13 to move the ratchet disc 21 to rotate. The outer ring of the ratchet disc 21 is provided with a plurality of evenly distributed ratchet teeth, and the pawl 13 is inserted into the ratchet groove when extended. The ratchet disc 21 can be driven by the first driving cylinder 12 to make intermittent rotation around the ratchet disc core 22, rotating one grid (i.e., the distance of a storage cavity 25) at a time. The ratchet disc core 22 is located in the middle of the ratchet disc 21 and is fixed. When the ratchet disc 21 needs to rotate, the first driving cylinder 12 moves, driving the pawl 13 to extend and press against the ratchet teeth of the gear disc to push the ratchet disc 21 to rotate the distance of a storage cavity 25, so that the storage cavity 25 closest to the leak hole is rotated to the leak hole, and the core head 47 in the storage cavity falls through the leak hole to the V-shaped flap 31.

[0053] like Figure 7 As shown, the V-shaped flap 31 is composed of two plates. When the lower ends of the two plates are fitted together, a V-shaped flap 31 with a V-shaped groove is formed. The V-shaped flap 31 is controlled to open and close by a V-shaped flap driving mechanism. The centering device includes a clamping cylinder 38 and a centering plate 39. The two clamping claws on the clamping cylinder respectively fix a pair of centering plates 39. The clamping claw cylinder 38 can drive the centering plate 39 to move and clamp or loosen the core head 47 in the V-shaped flap 31. The centering plate 41 is located directly below the center position between the two centering plates 39. That is, the centering plate 41 is at an equal distance from the two centering plates 39, the clamping claw cylinder 38 is a two-claw cylinder, the clamping claw cylinder 38 is fixed to the support frame 10, the centering plate 39 is located in the gap at the lower ends of the two plates, when the core head 47 falls into the V-shaped flap through the leak hole 28, the core head is adjusted to be horizontally located in the V-shaped groove of the V-shaped flap 31, the clamping claw cylinder 38 drives the two centering plates 39 to run synchronously to clamp the core head 47, at this time, the center line of the core head 47 in the length direction is located directly above the centering plate 41, that is, the function of the primary orientation mechanism 30 is to place the core head horizontally The V-shaped flap 31 is placed inside the V-shaped flap, and the center line of the core head in the length direction is determined so that the center line of the core head in the length direction just falls on the dividing plate 41 below it. The specific principle is as follows: Step 1: Place the core head 47 horizontally in the V-shaped flap. First, the direction of the core head before entering the V-shaped flap 31 is random. When it falls into the V-shaped flap 31 at a certain impact speed, since the surface of the core head is a smooth circle, its only stable state is when its axis is placed in the V-shaped groove of the V-shaped flap in the longitudinal direction. Otherwise, the core head will fall over and finally be in a longitudinally straight state. After this step, Figure 7 and Figure 8As shown in the figure, the axial direction of the core head is determined, but the direction of the core head's large end is still random; the second step: determine the center line of the core head's length direction, such as Figure 6 As shown, utilizing the centring characteristic of the jaw cylinder 38 (taking a two-jaw cylinder as an example, that is, the two jaws on the cylinder move in opposite directions and have equal movement strokes, and no matter how long the object they clamp is, the center point of its length is always on the center line between the two jaws of the cylinder), a centering plate 39 is fixed on the jaws of the jaw cylinder 38. Therefore, when the centering plate 39 clamps the core head, the center point of the length direction of the core head is located on the center line between the two centering plates 39. At the same time, a dividing plate 41 is arranged directly below the center line between the two centering plates 39 of the jaw cylinder. Therefore, when the centering plate 39 clamps the core head and then releases the core head, the center line of the length direction of the core head must just fall on the blade part of the dividing plate 41, that is, the tip part of the dividing plate.

[0054] like Figure 4 As shown, the V-shaped flap driving mechanism includes a third driving cylinder 32, a first connecting member 34 and a second connecting member 35. The third driving cylinder 32 is fixed on the support frame 10, and the piston rod of the third driving cylinder 32 is fixedly connected to the driving member 33. One end of the first connecting member 34 is rotatably connected to the driving member 33 through a connecting shaft 37, and the other end of the first connecting member 34 is rotatably connected to the second connecting member 35 through a connecting shaft 37. The first connecting member 34 is fixedly connected to a plate in the V-shaped flap through a fixed shaft 36, and the second connecting member 35 is fixedly connected to another plate in the V-shaped flap through a fixed shaft 36. The third driving cylinder 32, the first connecting member 34 and the second connecting member 35 are used to control the opening and closing operation of the two plates of the V-shaped flap, which is very convenient. The plate as a whole has a thick upper end and a thin lower end. When the two plates are closed under the action of the third driving cylinder, that is, their lower ends are in contact with each other, a V-shaped flap is formed, that is, a V-shaped groove is formed on the V-shaped flap to hold the core head; when the two plates are opened, the core head can fall from the gap between the two.

[0055] like Figure 6As shown, the commutator 43 is composed of a baffle 44 and a slide plate 45, a baffle 44 is provided on each side of the slide plate 45, the dividing plate 41 is located at the center of the two baffles 44, and the slide plate 45 is connected to the slide rail 46. The slide plate 45 is arranged obliquely, and the low point of the slide plate 45 is connected to the slide rail 46, the slide rail 46 is arranged obliquely and a V-shaped groove is provided on the slide rail, and the top of the dividing plate 41 is provided with an inclined surface 42 of an inverted "V" structure. The secondary orientation mechanism 40 is used to make the core head 47 slide into the slide rail 46 with its head downward, that is, the core head sliding out of the slide rail 46 always has its head downward, which is convenient for subsequent operations. The specific principle is as follows: when the center line of the core head in the length direction just falls on the knife edge part of the dividing plate 41 (that is, the top of the dividing plate), due to the effect of gravity, the core head will definitely fall toward the big head side. When the big head of the core head falls and contacts the inclined slide plate 45, because the slide plate is inclined toward the slide rail 46 side, the big head of the core head slides down to the lower part of the slide plate 45 (that is, toward the slide rail), and the knife edge part of the dividing plate is an inverted V-shaped inclined surface 42 (such as Fig.10 As shown in the figure, the small end of the core head is limited in sliding and cannot slide down synchronously with the large end, so that the large end of the core head will automatically face downward, complete the reversing operation, and then slide into the slide rail 46, slide down along the V-shaped slide rail 46, so that the subsequent grasping mechanism can grasp the core head and install it into the pipe in the set correct direction. There are commutators 43 on both sides of the dividing plate 41. No matter which side of the commutator 43 the large end of the core head falls into, the final result is the same, which will make the large end of the core head slide downward into the slide rail 46.

[0056] The operation method of the core head automatic circulation machine for pipe drawing is as follows:

[0057] Step 1: If Figure 2 As shown; when the drawing of the drawing material 9 in a material basket of a material discharge station is completed, the core head 47 of the drawing die 8 falls off at A, and the core head is transported to B by the core head transport swing arm 300. If the material basket to be drawn is in the same pass as the drawn material basket at this time, the core head does not need to be replaced, and the process proceeds to step 2. If the materials of the same pass have been drawn once at this time, the core head needs to be replaced, and the process proceeds to step 3;

[0058] Step 2: The first stopper 15 is retracted, and the second stopper 17 opens the core head conveying swing arm 300, so that the core head 47 in the swing arm falls into the circulation inclined cavity 26 of the ratchet core 22, and the core head slides down along the inclined bottom of the circulation inclined cavity to the storage cavity 25 connected with the circulation inclined cavity, and enters the V-shaped flap 31 through the leak hole 28, and then goes to step 4;

[0059] Step three: the first baffle rod 15 is extended under the action of the second driving cylinder 16, triggering the front baffle of the core head conveying swing arm 300 in advance, so that the core head in the swing arm falls into the recovery material chamber 27, and the core head rolls down along its inclined bottom into a corresponding storage chamber to complete the recovery, and this core head no longer participates in the circulation; at the same time, the ratchet disc 21 rotates one grid under the action of the first driving cylinder 12, and the core head pre-arranged in the storage chamber 25 closest to the leak hole is pushed into the leak hole 28, and the core head enters the V-shaped flap 31, and enters step four; the automatic selection function of the core head is realized through steps one, two and three;

[0060] Step 4: If Figure 6 and 7 As shown; after the core head 47 falls into the V-shaped flap 31, under the action of the V-shaped flap and gravity, the core head 47 is horizontally placed in the V-shaped flap 31, and at the same time, the clamping claw cylinder 38 drives the centering plate 39 to clamp the core head;

[0061] Step 5: If Fig. 9 and 10 As shown; the clamping cylinder 38 releases the core head 47, and at the same time the V-shaped flap 31 is opened under the action of the third driving cylinder 32, so that the core head 47 falls and the center line of the core head in the length direction falls on the centering plate 41;

[0062] Step 6: If Figure 6 As shown; the core head falls toward the big end side under the action of gravity. When the big end of the core head falls and contacts the inclined slide plate 45, the big end of the core head slides down to the lower part of the slide plate 45, and then slides into the slide rail 46, and slides down along the V-shaped slide rail 46, that is, the core head 47 slides out of the slide rail 46 with the big end facing downward.

[0063] It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A core head automatic circulation machine for pipe drawing, characterized in that: The invention comprises a support frame (10), wherein the support frame (10) is provided with a ratchet disc assembly (20), a primary orientation mechanism (30), a secondary orientation mechanism (40) and a slide rail (46), wherein the ratchet disc assembly (20) comprises a ratchet disc core (22) fixed to the support frame (10) and a ratchet disc ring (21) capable of rotating around the ratchet disc core, wherein the ratchet disc core (22) is used to receive a core head (47) that has been pulled out and to transport the core head (47) to the ratchet disc ring (21), wherein a plurality of core heads (47) are stored in the ratchet disc ring (21), and the ratchet disc ring (21) is capable of transporting the core heads (47) to the primary orientation mechanism (30), wherein the primary orientation mechanism (30) The secondary orientation mechanism (40) comprises a V-shaped flap (31) and a centering device. The V-shaped flap (31) is used to receive a core head (47) that has fallen off from a ratchet wheel (21). The centering device is used to clamp the core head (47) in the V-shaped flap (31) and make the center line of the core head (47) in the length direction be located directly above the centering plate (41). After the centering device releases the core head (47), the center line of the core head (47) in the length direction falls on the centering plate (41), and at the same time, the large end of the core head (47) falls on the commutator (43). The commutator (43) makes the large end of the core head (47) fall into a slide rail (46) downward.

2. The core head automatic circulation machine for pipe drawing according to claim 1 is characterized in that: The support frame (10) is fixedly provided with a base (11), the ratchet disc core (22) is fixed on the base (11), the primary orientation mechanism (30) and the secondary orientation mechanism (40) are located below the base (11), the ratchet disc ring (21) is sleeved on the outer ring of the ratchet disc core (22), the ratchet disc core (22) is provided with a circulating oblique cavity (26) and a recovering oblique cavity (27), and the four edges of the ratchet disc ring (21) are provided with a plurality of A plurality of storage chambers (25) are evenly distributed and separated from each other, the circulation oblique chamber (26) and the recovery oblique chamber (27) are respectively connected to different storage chambers (25), a cover plate (24) is provided above the ratchet disc (21), and a bottom plate (23) is provided below the cover plate (24), a leakage hole (28) is provided on the bottom plate (23), the leakage hole (28) is connected to a storage chamber (25), and the leakage hole (28) is located above the V-shaped flap (31).

3. The core head automatic circulation machine for pipe drawing according to claim 2 is characterized in that: A fixing frame (14) is fixedly provided on the base (11), and a second driving cylinder (16) and a second baffle rod (17) are fixedly provided on the fixing frame (14); the piston rod of the second driving cylinder (16) is fixedly connected to the first baffle rod (15); the first baffle rod (15) is located directly above the recovery oblique chamber (27); the second baffle rod (17) is located directly above the circulation oblique chamber (26); the bottoms of the circulation oblique chamber (26) and the recovery oblique chamber (27) are arranged in an inclined manner, and the low point of the bottom is connected to the storage chamber (25).

4. The core head automatic circulation machine for pipe drawing according to claim 3 is characterized in that: At least one ratchet disc drive mechanism is provided on the base (11), and the ratchet disc drive mechanism comprises a first drive cylinder (12) and a ratchet pawl (13) fixedly connected to the piston rod of the first drive cylinder. The first drive cylinder (12) can drive the ratchet pawl (13) to move the ratchet disc (21) to rotate. The outer ring of the ratchet disc (21) is provided with a plurality of evenly distributed ratchet teeth. When the ratchet pawl (13) is extended, it is inserted into the ratchet tooth groove.

5. The core head automatic circulation machine for pipe drawing according to claim 4 is characterized in that: The V-shaped flap (31) is composed of two plates. When the lower ends of the two plates are fitted together, a V-shaped flap (31) with a V-shaped groove is formed. The V-shaped flap (31) is controlled to open and close by a V-shaped flap driving mechanism. The centering device includes a clamping cylinder (38) and a centering plate (39). Two clamping claws on the clamping cylinder respectively fix a centering plate (39). The clamping claw cylinder (38) can drive the centering plate (39) to move and clamp or loosen the core head (47) in the V-shaped flap (31). The centering plate (41) is located directly below the center position between the two centering plates (39).

6. The core head automatic circulation machine for pipe drawing according to claim 5 is characterized in that: The V-shaped flap driving mechanism comprises a third driving cylinder (32), a first connecting member (34) and a second connecting member (35); the third driving cylinder (32) is fixed on the support frame (10); the piston rod of the third driving cylinder (32) is fixedly connected to the driving member (33); one end of the first connecting member (34) is rotatably connected to the driving member (33) via a connecting shaft (37); the other end of the first connecting member (34) is rotatably connected to the second connecting member (35) via a connecting shaft (37); the first connecting member (34) is fixedly connected to a plate in the V-shaped flap via a fixed shaft (36); and the second connecting member (35) is fixedly connected to another plate in the V-shaped flap via a fixed shaft (36).

7. The core head automatic circulation machine for pipe drawing according to claim 6 is characterized in that: The commutator (43) is composed of a baffle (44) and a slide plate (45). A baffle (44) is provided on each side of the slide plate (45). The center plate (41) is located at the center of the two baffles (44). The slide plate (45) is connected to a slide rail (46).

8. The core head automatic circulation machine for pipe drawing according to claim 7 is characterized in that: The slide plate (45) is arranged obliquely, and the low point of the slide plate (45) is connected to the slide rail (46). The slide rail (46) is arranged obliquely and is provided with a V-shaped groove. The top of the dividing plate (41) is provided with an inclined surface (42) of an inverted "V"-shaped structure.

9. An operating method of the core head automatic circulation machine for tube drawing according to claim 8, characterized in that: Here are the steps: Step 1: When the drawing of the drawing material (9) in a material basket of a material discharge station is completed, the core head (47) of the drawing die (8) falls off at A, and the core head is transported to B by the core head transport swing arm (300). If the material basket to be drawn and the finished material basket are in the same pass at this time, the core head does not need to be replaced, and the process proceeds to step 2. If the materials in the same pass have been drawn once at this time, the core head needs to be replaced, and the process proceeds to step 3; Step 2: The first baffle (15) is retracted, and the second baffle (17) opens the core head conveying swing arm (300), so that the core head (47) in the swing arm falls into the circulating inclined cavity (26) of the ratchet disc core (22), and the core head slides down along the inclined bottom of the circulating inclined cavity to the storage cavity (25) connected to the circulating inclined cavity, and enters the V-shaped flap (31) through the leak hole (28), and then proceeds to step 4; Step three: the first baffle rod (15) is extended under the action of the second driving cylinder (16), triggering the front baffle of the core head conveying swing arm (300) in advance, so that the core head in the swing arm falls into the recovery material chamber (27), and the core head rolls down along its inclined bottom into a corresponding storage chamber, completing the recovery, and this core head no longer participates in the circulation; at the same time, the ratchet disc (21) rotates one grid under the action of the first driving cylinder (12), pushing the core head pre-arranged in the storage chamber (25) closest to the leak hole into the leak hole (28), and the core head enters the V-shaped flap (31), and enters step four; Step 4: After the core head (47) falls into the V-shaped flap (31), the core head (47) is horizontally placed in the V-shaped flap (31) under the action of the V-shaped flap and gravity, and at the same time, the clamping claw cylinder (38) drives the centering plate (39) to clamp the core head; Step 5: The clamping cylinder (38) releases the core head (47), and at the same time, the V-shaped flap (31) opens under the action of the third driving cylinder (32), so that the core head (47) falls and the center line of the core head in the length direction falls on the centering plate (41); Step 6: The core head falls toward the large end side under the action of gravity. When the large end of the core head falls and contacts the inclined slide plate (45), the large end of the core head slides down to the lower part of the slide plate (45), then slides into the slide rail (46), and slides down along the V-shaped slide rail (46), that is, the core head (47) slides out of the slide rail (46) with the large end facing downward.

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