A three-hole drilling rig

Abstract

The present invention belongs to the field of valve body drilling, and specifically relates to a three-hole drilling rig. The present invention includes a frame and a three-jaw chuck arranged on the frame and driven by a feed power source, wherein a group of drill bits are arranged on the three jaws of the three-jaw chuck respectively, and the drill bits and drill rods are all pointed to the axis direction of the three-jaw chuck; the three-hole drilling rig also includes a profiling tooling, wherein the profiling tooling is in the shape of a sleeve coaxial with the three-jaw chuck, and the barrel cavity contour of the profiling tooling coincides with the outer wall contour of the workpiece for the workpiece axis to be inserted and positioned; a passage hole for the drill bit and drill rod to pass through is arranged radially through the barrel wall of the profiling tooling. The present invention can realize the automatic three-hole drilling operation of the outer wall of the workpiece, which can not only greatly improve the drilling efficiency, but also has the advantages of convenient operation and high drilling accuracy, and can avoid omission and wrong processing while processing in large quantities, thereby significantly improving the market competitiveness of machining enterprises.

Description

Technical Field

[0001] The invention belongs to the field of valve body drilling, and in particular relates to a three-hole drilling machine. Background Art

[0002] At present, valves and other mechanical parts need to be processed with holes, especially valve sleeves, which mostly need to drill three holes evenly distributed at 120 degrees on the side wall. When drilling three holes, a pressure plate line is generally drawn on the valve sleeve, and then a single drill head machine tool is used, and the workpiece is rotated to achieve the purpose of three-hole processing in sequence. Since the three holes must be distributed at 120 degrees, the manual drilling process is not only inefficient, but also prone to omissions and wrong processing; not only is the operation cumbersome and time-consuming, but the accuracy cannot be guaranteed after rotation, and the scrap rate is high, so it is naturally impossible to process in large quantities, which brings many troubles to the actual machining operation. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a three-hole drilling rig which is reasonably structured and reliable and convenient to use, and which can realize the automatic three-hole drilling operation on the outer wall of a workpiece, which can not only greatly improve the drilling efficiency, but also has the advantages of convenient operation and high drilling accuracy. It can perform large-scale processing while avoiding omissions and wrong processing, thereby significantly improving the market competitiveness of machining enterprises.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A three-hole drilling rig, characterized in that: the three-hole drilling rig includes a frame and a three-jaw chuck arranged on the frame and driven by a feed power source, a group of drill bits are arranged on the three jaws of the three-jaw chuck respectively, and the drill bits and drill rods all point to the axis direction of the three-jaw chuck; the three-hole drilling rig also includes a profiling tooling, the profiling tooling has a sleeve shape coaxial with the three-jaw chuck, the barrel cavity contour of the profiling tooling coincides with the outer wall contour of the workpiece for the workpiece axis to be inserted and positioned; a passage hole for the drill bit and drill rod to pass through is arranged radially through the barrel wall of the profiling tooling.

[0006] Preferably, the three-hole drilling rig further comprises an ejector block, which is coaxially arranged in the barrel cavity of the profiling tooling, and the ejector block is driven by an ejector cylinder to produce a reciprocating telescopic motion along the axial direction of the profiling tooling; when the ejector block is in an initial state, the top surface of the ejector block and the barrel cavity of the profiling tooling jointly enclose a placement space for placing and positioning a workpiece.

[0007] Preferably, an air jet groove is recessed on the outer wall of the ejection block or an air jet hole is arranged in the ejection block, and the long direction of the air jet groove or the axis of the air jet hole is parallel to the axis of the ejection block; the number of the air jet grooves or the air jet holes is three groups so as to correspond one to one to the corresponding through holes, and the axis of each group of air jet grooves or air jet holes intersects with the axis of the corresponding through hole, and the air inlet end of the air jet groove or the air jet hole is connected to an external air source.

[0008] Preferably, a positioning plate is arranged on one of the drill bits or one of the jaws, and the positioning plate extends axially toward the rear of the three-jaw chuck along the three-jaw chuck; a first support rod is arranged on the frame behind the three-jaw chuck, and a first proximity switch for limiting the minimum opening distance of the three-jaw chuck and a second proximity switch for limiting the maximum opening distance of the three-jaw chuck are arranged in sequence on the first support rod along the radial direction of the three-jaw chuck, and a matching relationship is formed between the positioning plate and each proximity switch.

[0009] Preferably, the three-hole drilling rig also includes a tailstock top plate arranged on a frame directly in front of the three-jaw chuck, and the tailstock top plate is driven by a tailstock power source to produce a reciprocating telescopic motion along the axial direction of the three-jaw chuck; when the tailstock top plate is in an initial state, there is a gap between the tailstock top plate and the profiling tooling for loading materials; when the tailstock top plate is in a working state, the tailstock power source drives the tailstock top plate forward and pushes the workpiece into the barrel cavity of the profiling tooling.

[0010] Preferably, the tailstock top plate and the tailstock power source are both fixed on the tailstock plate, and a second support rod is also arranged on the tailstock plate. A third proximity switch for limiting the maximum process length of the tailstock top plate and a fourth proximity switch for limiting the maximum return length of the tailstock top plate are arranged in sequence along the radial direction of the three-jaw chuck on the second support plate.

[0011] Preferably, the tailstock power source and the feed power source are both feed cylinders.

[0012] Preferably, the ejection block has a prism shape that matches the shape of the contoured tooling barrel cavity.

[0013] The beneficial effects of the present invention are:

[0014] 1) Abandoning the many defects caused by the traditional use of vertical drilling rigs, the present invention overcomes the inherent technical prejudice of the prior art that "the rod body must be axially installed on the three-jaw chuck", so that the drill rods of the three sets of drilling rigs after installation are radially installed on the three-jaw chuck, and then the advance and retreat of the jaws are used to achieve the purpose of high-precision drilling and cutting relative to the workpiece. In this way, in actual work, it is only necessary to put the workpiece into the profiling tooling, and through the reserved passage hole on the profiling tooling, and then use the advance and retreat of the three jaws to make the drill rods of the three sets of drilling rigs timely extend into the passage hole and perform the automatic three-hole operation relative to the outer wall of the workpiece, with a very high degree of automation.

[0015] In summary, the present invention can not only greatly improve the drilling efficiency, but also has the advantages of convenient operation and high drilling accuracy. It can avoid omissions and incorrect processing while processing in large quantities, thereby significantly improving the market competitiveness of machining companies.

[0016] 2) As a further preferred solution of the above solution, the ejection block is provided to eject the workpiece in the mold cavity, i.e., the profiling tool cylinder cavity, so as to achieve the purpose of quickly removing the workpiece and adjust the position and size at the same time. The ejection block is provided with an air jet slot or an air jet hole. When the workpiece is drilled and automatically ejected, compressed air is ejected from the air jet slot or the air jet hole at the same time: on the one hand, the chips generated by the drilling are blown out, and on the other hand, the drill rod of the drill bit is cooled, thereby ensuring the working stability and long service life of the overall structure under long-term continuous working conditions.

[0017] 3) The purpose of the arrangement of the positioning plate is to provide a first proximity switch and a second proximity switch to place the substrate. The second proximity switch is used to limit the maximum opening size of each claw at the three-claw chuck to prevent the claw from being separated from the guide groove of the three-claw chuck; the first proximity switch is used to limit the minimum opening size of each claw at the three-claw chuck to prevent the claws from being too close to each other and causing position interference with the contouring tooling. Each proximity switch can use a photoelectric sensor or a traditional limit switch, etc., as long as it can play its inherent position limit function, it will not be repeated here.

[0018] 4) Since force needs to be applied to the workpiece during drilling, the radial movement of the workpiece will be limited by the outer wall of the profiling tooling, while the inward movement of the workpiece is limited by the ejection block. At this time, the workpiece may fall outward; at this time, the tailstock top plate needs to be designed, so that the tailstock top plate can be used to serve a purpose similar to a "bottle cap". After the workpiece is placed in place, the tailstock top plate is covered on the feed end of the profiling tooling, ultimately ensuring the position stability of the workpiece during processing. Since loading and unloading is required, the tailstock top plate needs to be driven by the tailstock power source to produce reciprocating axis movement.

[0019] 5) The third proximity switch and the fourth proximity switch have similar working modes to the first proximity switch and the second proximity switch. The third proximity switch and the fourth proximity switch are used to limit the forward and backward distances of the tailstock top plate to ensure high reliability and high accuracy of their operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 and Figure 2 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 3 It is a front view of the present invention;

[0022] Figure 4 It is a right side view of the present invention;

[0023] Figure 5 It is a three-dimensional diagram of the coordination state of the three-jaw chuck, drill bit and contour tooling;

[0024] Figure 6 for Figure 5 Schematic diagram of the three-dimensional structure after removing the contour tooling;

[0025] Figure 7 for Figure 6 A partial enlarged view of part I.

[0026] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0027] a-Workpiece

[0028] 10-Rack

[0029] 20- three-jaw chuck 21- feed power source 22- jaw

[0030] 30-Drill Bit

[0031] 40-Profiling tooling 41-Passage hole

[0032] 50- ejector block 51- ejector cylinder 52- jet slot

[0033] 61- positioning plate 62- first support rod

[0034] 63-first proximity switch 64-second proximity switch

[0035] 70- tailstock top plate 71- tailstock power source 72- tailstock plate

[0036] 81- second support rod 82- third proximity switch 83- fourth proximity switch DETAILED DESCRIPTION

[0037] For ease of understanding, here we combine Figure 1-7 The specific structure and working mode of the present invention are further described as follows:

[0038] The specific structure of the present invention is as follows Figure 1-7 As shown, its structure includes a frame 10, a three-jaw chuck 20 and a tailstock top plate 70 arranged on the frame 10. The three-jaw chuck 20 is driven by a feed power source 21 to produce a synchronous opening and closing action, and the tailstock top plate 70 is driven by a tailstock power source 71 to produce a telescopic action. In fact, the action state and arrangement state of the three-jaw chuck 20 are similar to those of a traditional lathe, except that the rotation action of the three-jaw chuck 20 on the lathe is discarded and only the opening and closing action is retained. Among them:

[0039] like Figure 1-5As shown, a set of drill bits 30 are fixed to the three jaws 22 of the three-jaw chuck 20 by means of threaded connection or the like. The drill bits 30 are independent parts and are driven by external power to generate rotational motion. Figure 5-7 The three drill bits 30 are shown as being located on the same vertical plane and all pointing to the axis of the three-jaw chuck 20. Through the opening and closing of the three-jaw chuck 20, the three sets of drill bits 30 can produce a synchronous three-hole drilling action for the workpiece a coaxially fixed to the axis of the three-jaw chuck 20.

[0040] To fix the workpiece a, the present invention adds Figure 5 The profiling tool 40 shown in the figure. The profiling tool 40, as its name implies, fixes the workpiece a by profiling the internal mold cavity. The profiling tool 40 of the present invention is sleeve-shaped in appearance, and the inner end surface of the profiling tool 40 is directly fixed on the disk surface of the three-jaw chuck 20. The outer shape of the cylindrical cavity of the profiling tool 40 is consistent with the outer wall contour of the workpiece a to be processed, that is, the valve sleeve. In order to ensure the precision and accuracy of the drilling process, the outer wall of the profiling tool 40 is arranged corresponding to the three-hole drilling position as shown in the figure. Figure 5 The three groups of passage holes 41 shown are for the drill rod to extend into and drill holes; Figure 5 In the embodiment, the three groups of through holes 41 directly protrude from the outer wall of the contoured tooling 40 to form a convex ring structure. In actual use, only through holes may be provided.

[0041] Taking into account the demoulding requirements after drilling, the present invention also Figure 6-7 As shown, an ejector block 50 is arranged in the barrel of the profiling tool 40. The ejector block 50 is driven by the ejector cylinder 51 to produce a telescopic movement. When the ejector block 50 is in the initial state, the ejector block 50 retracts and is located deep in the barrel of the profiling tool 40. At this time, the top surface of the ejector block 50 and the barrel of the profiling tool 40 together form a placement space for placing the workpiece a. When the drilling is completed, the ejector block 50 is lifted up by the action of the ejector cylinder 51, thereby ejecting the workpiece a out of the barrel of the profiling tool 40 to achieve a convenient unloading operation. Figure 7 As shown, an air injection groove 52 or an air injection hole is arranged at the ejection block 50. When the workpiece a is drilled and automatically ejected, compressed air is ejected from the air injection groove 52 or the air injection hole at the same time: on the one hand, the chips generated by the drilling are blown out, and on the other hand, the drill rod of the drill bit 30 is cooled, thereby ensuring the working stability and long service life of the overall structure under long-term continuous working conditions.

[0042] Since force needs to be applied to the workpiece a during drilling, the radial movement of the workpiece a will be limited by the outer wall of the contouring tool 40, and the inward movement of the workpiece a will be limited by the ejection block 50. At this time, the workpiece a may fall off outward; at this time, it is necessary to design Figure 1-3The tailstock top plate 70 shown in the figure is used to serve a purpose similar to a "bottle cap". After the workpiece a is placed in place, the tailstock top plate 70 is covered on the feed end of the profiling tool 40, and finally the position stability of the workpiece a during processing is ensured. Since loading and unloading are required, the tailstock top plate 70 needs to be driven by the tailstock power source 71 to produce a reciprocating axis movement.

[0043] To facilitate further understanding of the present invention, the specific working process of the present invention is given as follows:

[0044] 1) Loading:

[0045] The original state of the present invention refers to Figure 1-5 When loading, firstly, the workpiece a is placed in the profiling tool 40, and then the start button is pressed, the tailstock power source 71 is ejected, and the tailstock top plate 70 is pushed to the third proximity switch 82 on the second support rod 81, and the workpiece a is supported; at this time, the position of the workpiece a is wrapped and fixed by the top surface of the ejection block 50, the barrel cavity of the profiling tool 40 and the top surface of the tailstock top plate 70.

[0046] 2) Drilling

[0047] The third proximity switch 82 senses the position of the tailstock top plate 70 and sends a signal to the electric control box. The three sets of drill bits 30 work, the feed power source 21 rotates forward, and the jaws 22 of the three-jaw chuck 20 all move toward the workpiece a, and the drill bit 30 drills into the side wall of the workpiece a through the through hole 41.

[0048] 3) Unloading

[0049] When the drill bit 30 and the drill rod are fed to the specified depth in the workpiece a, the first proximity switch 63 on the first support rod 62 senses the position of the positioning plate 61 and sends a signal to the electric control box, the feed power source 21 starts to reverse, the three sets of jaws 22 open, and the drill bit 30 returns to the second proximity switch 64. The second proximity switch 64 senses the information that the drill bit 30 is in place, the feed power source 21 stops, and the tailstock power source 71 drives the tailstock top plate 70 to return to the fourth proximity switch 83. The fourth proximity switch 83 senses the information that the tailstock top plate 70 is in place, and the workpiece a is automatically ejected by the ejection block 50. At the same time, the compressed air is blown along the direction as shown in the figure. Figure 6 On the one hand, the chips are blown out, and on the other hand, the drill bit 30 is cooled. The blowing time can be controlled by a time relay. Afterwards, the ejector block 50 is reset under the return stroke of the ejector cylinder 51, and a working cycle ends.

[0050] Of course, the above solution is only for Figure 1-6The structure in the specific embodiment shown is described; in actual operation, the present invention can be combined with software in the prior art to realize the process and automation of the above-mentioned drilling action, but it must be pointed out that the software and even the operation mode of the electric control box that cooperate with the present invention are existing mature technologies, which are not the innovative part of the present invention, nor are they a component of the present invention. In addition, if other sensing systems are used instead of just proximity switches as sensing devices, or each power source is replaced by other power mechanisms such as oil cylinders or even crank slider mechanisms, or even the workpiece a is blown out by pneumatic means instead of ejecting the workpiece a by ejection block 50, etc., these conventional changes in the original structure and function of the present invention should also be regarded as equivalent or similar designs and fall within the protection scope of the present invention.

Claims

1. A three-hole drilling rig, characterized in that: The three-hole drilling machine comprises a frame (10) and a three-jaw chuck (20) arranged on the frame (10) and driven by a feed power source (21), wherein a group of drill bits (30) are arranged on the three jaws (22) of the three-jaw chuck (20) respectively, and the drill bits (30) and drill rods are all pointed in the direction of the axis of the three-jaw chuck (20); the three-hole drilling machine also comprises a profiling tool (40), wherein the profiling tool (40) is in the shape of a sleeve coaxial with the three-jaw chuck (20), and the barrel contour of the profiling tool (40) coincides with the outer wall contour of the workpiece so that the axis of the workpiece can be inserted and positioned; a passage hole (41) is arranged radially through the barrel wall of the profiling tool (40) for the drill bit (30) and the drill rod to pass through; The three-hole drilling machine further comprises an ejector block (50), the ejector block (50) being coaxially arranged in the cylindrical cavity of the profiling tool (40), and the ejector block (50) being driven by an ejector cylinder (51) to produce a reciprocating telescopic motion along the axial direction of the profiling tool (40); when the ejector block (50) is in an initial state, the top surface of the ejector block (50) and the cylindrical cavity of the profiling tool (40) are jointly enclosed to form a placement space for placing and positioning a workpiece; The ejection block (50) is provided with an air jet groove (52) on the outer wall thereof or an air jet hole is arranged in the ejection block (50), and the length direction of the air jet groove (52) or the axis of the air jet hole is parallel to the axis of the ejection block (50); the number of the air jet grooves (52) or the air jet holes is three groups so as to correspond one to one to the corresponding passage holes (41), and the axis of each group of air jet grooves (52) or the air jet holes intersects with the axis of the corresponding passage hole (41), and the air inlet end of the air jet groove (52) or the air jet hole is connected to an external air source; A positioning plate (61) is arranged on one of the drill bits (30) or one of the jaws (22), and the positioning plate (61) extends along the axial direction of the three-jaw chuck (20) toward the rear of the three-jaw chuck (20); a first support rod (62) is arranged on the frame (10) behind the three-jaw chuck (20), and a first proximity switch (63) for limiting the minimum opening distance of the three-jaw chuck (20) and a second proximity switch (64) for limiting the maximum opening distance of the three-jaw chuck (20) are arranged in sequence on the first support rod (62) along the radial direction of the three-jaw chuck (20), and a matching relationship is formed between the positioning plate (61) and each proximity switch; The three-hole drilling machine further comprises a tailstock top plate (70) arranged on a frame (10) directly in front of the three-jaw chuck (20), wherein the tailstock top plate is driven by a tailstock power source (71) to generate a reciprocating telescopic motion along the axial direction of the three-jaw chuck (20); when the tailstock top plate (70) is in an initial state, a gap for loading materials exists between the tailstock top plate (70) and the profiling tooling (40); when the tailstock top plate (70) is in a working state, the tailstock power source (71) drives the tailstock top plate (70) to move forward and push the workpiece into the barrel cavity of the profiling tooling (40).

2. A three-hole drilling machine according to claim 1, characterized in that: The tailstock top plate (70) and the tailstock power source (71) are both fixed on the tailstock plate (72), and a second support rod (81) is also arranged on the tailstock plate (72). A third proximity switch (82) for limiting the maximum travel length of the tailstock top plate (70) and a fourth proximity switch (83) for limiting the maximum return length of the tailstock top plate (70) are sequentially arranged on the second support plate along the radial direction of the three-jaw chuck (20).

3. A three-hole drilling machine according to claim 1, characterized in that: The tailstock power source (71) and the feed power source (21) are both feed cylinders.

4. A three-hole drilling machine according to claim 1, characterized in that: The ejection block (50) has a prism shape that matches the shape of the barrel cavity of the contoured tooling (40).

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