CN211516154U - Boring machine - Google Patents

Abstract

The utility model provides a boring machine belongs to machining technical field. The boring machine solves the problem that an existing boring machine is inconvenient to assemble and disassemble when an inner hole of a large workpiece is machined. This boring machine, which comprises a frame, the boring bar, power device and be used for the boring jig of fixed work piece, the boring jig includes inner support seat and outer support seat, the boring bar is including dismantling preceding boring bar and the back boring bar of coaxial grafting, preceding boring bar is worn to locate on the inner support seat, back boring bar is worn to locate on the outer support seat, the one end of preceding boring bar and power device's output shaft, wear to be equipped with the pull rod in back boring bar opens along the axial through-hole and the through-hole, the both ends of pull rod are all stretched out outside the through-hole, the one end of pull rod have the external screw thread and with preceding boring bar threaded connection, the other end of pull rod has the portion of supporting by, preceding boring bar is provided with the boring cutter on being close to the circumference of back boring. The utility model discloses at the loading and unloading in-process of work piece, preceding boring bar can remove in opposite directions with the back boring bar, has both improved the handling efficiency of work piece, has guaranteed the cooperation precision between boring bar and the boring cutter again.

Description

Boring machine

Technical Field

The utility model belongs to the technical field of machining, a boring machine is related to, especially a boring machine for processing the great and longer work piece of bore hole.

Background

The pump body of lobe pump or double-screw pump is great generally, and the inner chamber size with rotor complex in the pump body is also great and length is longer, can't directly process through machining center, and at present, the pump body is usually earlier through the casting shaping, then stretches into the prefabricated hole of the pump body through the boring bar of boring machine and carries out the boring, makes the inner chamber of the pump body reach higher precision.

Because the length of the hole needing boring is long, the length of the boring rod also needs to be designed to be long, the weight of the boring rod is heavy, if the boring rod is lack of support during boring, the boring rod can deform to a certain extent under the action of gravity, and the machining precision is poor. Therefore, in order to ensure the precision of processing large-sized workpieces, as in a special boring machine disclosed in chinese patent application No. 201020653190.4, a workpiece is first fixed to a boring die holder, and then a boring bar is inserted into a prefabricated hole of the boring die holder and the workpiece, and two ends of the boring bar are positioned by inner and outer boring die holders located at two sides of the workpiece, so as to ensure the rigidity of the boring bar, and thus the processing precision. However, in order to ensure the position accuracy of the boring bar, the boring bar is usually in sliding fit with the inner and outer boring bar bases through the bearing bushes arranged on the inner and outer boring bar bases, the size of the inner hole of the bearing bush is basically the same as the outer diameter of the boring bar, and the boring bar needs to be provided with a boring cutter on the boring cutter hole on the outer wall of the boring bar when processing a workpiece, which results in that the overall outer diameter of the boring bar provided with the boring cutter is larger than the diameter of the inner hole of the bearing bush, therefore, when processing the workpiece, the workpiece needs to be fixed on the boring bar base first, then the boring bar without the boring cutter is sequentially inserted into the bearing bush of the inner boring bar base, the prefabricated hole of the workpiece and the bearing bush of the outer boring bar base, so that the boring cutter hole of the boring bar is located between the inner boring bar base and the workpiece, then the boring cutter is mounted on the boring bar, and then the workpiece is bored. After boring is completed, the workpiece can be taken out of the boring die holder after the boring bar is drawn out, the boring bar cannot be directly drawn out of the boring die holder and the workpiece due to interference between the boring cutter and the bearing bush, the boring cutter must be detached from the boring bar first, and then the boring bar can be withdrawn, so that the whole dismounting and mounting process is complicated, the matching precision of the boring cutter and the boring bar is influenced, and the boring cutter needs to be adjusted and calibrated every time, which is time-consuming and labor-consuming.

Disclosure of Invention

The utility model aims at having the above-mentioned problem to current technique, provided a boring machine, the utility model aims to solve the technical problem that: how to improve the loading and unloading efficiency of the workpiece when processing a large workpiece.

The purpose of the utility model can be realized by the following technical proposal: a boring machine comprises a rack, a boring rod, a power device and a boring jig, wherein the power device is arranged on the rack in a sliding mode, the boring jig is opposite to the power device and used for fixing a workpiece, the boring jig comprises an inner supporting seat and an outer supporting seat which are arranged at intervals, and the boring jig is characterized in that the boring rod comprises a front boring rod and a rear boring rod which are detachably and coaxially connected in an inserting mode, the front boring rod penetrates through the inner supporting seat, the rear boring rod penetrates through the outer supporting seat, one end of the front boring rod is connected with an output shaft of the power device, a through hole is formed in the rear boring rod in the axial direction, a pull rod penetrates through the through hole, two ends of the pull rod extend out of the through hole, an external thread is arranged at one end of the pull rod and is in threaded connection with the front boring rod, a supporting portion used for supporting the end face of the rear boring rod is arranged at the other end of the pull rod.

The boring machine is mainly used for processing an inner hole with a larger aperture and a longer length on a larger workpiece, the power device is transversely connected onto a rack in a sliding manner, the boring jig is arranged on one side, opposite to the power device, of the rack, the workpiece is fixed between an inner supporting seat and an outer supporting seat of the boring jig, in the scheme, the boring rod is of a structure that a front boring rod and a rear boring rod are detachably connected, the front boring rod is connected with the power device and penetrates through the inner supporting seat, meanwhile, the front boring rod is matched with a shaft hole in the inner supporting seat to form support and positioning, the front boring rod can axially slide relative to the inner supporting seat and axially rotate around a shaft, the rear boring rod penetrates through the outer supporting seat, and the rear boring rod is matched with the shaft hole in the outer supporting seat to form support and positioning, and can axially slide relative to the outer supporting seat and axially rotate around the shaft. When a workpiece needs to be installed on a boring die to bore the workpiece, a front boring bar and a rear boring bar are separated and move in opposite directions, namely the front boring bar moves towards one side of an inner supporting seat, a boring cutter on the front boring bar is positioned between the inner supporting seat and an outer supporting seat and is adjacent to the inner supporting seat, and the rear boring bar moves towards one side of the outer supporting seat, so that a space for placing the workpiece is formed between the inner supporting seat and the outer supporting seat; after a workpiece is fixed between the inner supporting seat and the outer supporting seat, the front boring bar and the rear boring bar are driven to move relatively and extend into a prefabricated hole to be machined in the workpiece, the front boring bar and the rear boring bar are connected in an inserted mode and then are connected with the front boring bar in a threaded mode through the pull rod, the front boring bar and the rear boring bar form stable connection, and then the boring bar is driven through the power device, so that a boring cutter on the boring bar can machine the prefabricated hole; after the machining is finished, the pull rod only needs to be screwed, the front boring rod and the rear boring rod are pulled out from the workpiece along opposite directions, and at the moment, the workpiece can be taken out from the boring jig only by loosening the boring jig to position the workpiece. Therefore, the step of dismounting the boring cutter when the workpiece is dismounted every time is avoided, the dismounting efficiency of the workpiece is higher, and the matching precision of the boring cutter and the boring rod is also ensured.

The utility model discloses a boring bar adopts preceding boring bar and back boring bar to be connected through dismantling between the fixed structure of rethread pull rod threaded connection after the grafting cooperation location between boring bar and the back boring bar, directly compares through threaded connection between preceding boring bar and the back boring bar, the utility model discloses only need revolve wrong pull rod, need not relative rotation between preceding boring bar and the back boring bar, can not form relative slip between the contact surface of preceding boring bar and back boring bar, has guaranteed the precision of grafting structure, and cooperation precision between preceding boring bar and the back boring bar is higher, and in addition, the whole quality of pull rod is littleer, revolves to revolve wrong required power of pull rod also littleer, and the dismouting is all lighter, and efficiency is higher.

In the boring machine, the end surface of the front boring bar facing the rear boring bar is provided with a tapered hole, the bottom of the tapered hole is provided with a threaded hole in threaded connection with the pull rod, and the end surface of the rear boring bar facing the front boring bar is provided with a tapered boss in interference fit with the tapered hole. The matching precision and the connection tightness between the front boring bar and the rear boring bar are ensured through the matching of the tapered hole and the tapered boss, and the integral structural stability of the boring bar is ensured through the pulling force generated by the bolt connection of the pull rod and the front boring bar.

In the boring machine, the pull rod is in a long-strip column shape, the diameter of the pull rod is smaller than the inner diameter of the through hole, and the outer diameter of the abutting part is larger than the inner diameter of the through hole. Therefore, the pull rod can smoothly rotate in the through hole in the screwing process, the torque on the pull rod is prevented from being transmitted to the rear boring rod, the matching precision between the front boring rod and the rear boring rod is ensured, and after the pull rod is screwed in place, the abutting part at the rear end of the pull rod is abutted with the rear end of the rear boring rod in a fitting manner, so that the front boring rod and the rear boring rod are tightly abutted.

In the boring machine, the length of the tapered hole is greater than that of the tapered boss, a retaining ring is further sleeved and fixed at one end of the pull rod in threaded connection with the front boring rod, the retaining ring is located on the outer side of the through hole, and the outer diameter of the retaining ring is greater than the inner diameter of the through hole. The baffle ring can be connected with the pull rod in a threaded connection or welding mode and is positioned between the bottom wall of the tapered hole and the tapered boss, the baffle ring is arranged to prevent the pull rod from being separated from the through hole of the rear boring bar, and after the pull rod is separated from the front boring bar, the rear boring bar can be driven to move by pulling the pull rod.

In the boring machine, the end part of one end, provided with the abutting part, of the pull rod is coaxially and fixedly connected with the handle, the handle is columnar, a distance is reserved between the handle and the rear boring rod, and the diameter of the handle is larger than the outer diameter of the pull rod, so that a knocking surface for a hammer to knock is formed at one end, facing the through hole, of the handle. Because preceding boring bar and back boring bar between form grafting complex bell mouth and toper boss for interference fit, lead to between the two connection comparatively firm, the difficult preceding boring bar that directly makes of bare-handed and the separation of back boring bar, the setting up of handle makes the staff can pass through the knock surface on knocking the handle with the wooden hammer, passes through the knock ring with the knock force of wooden hammer and transmits back boring bar, makes bell mouth and toper boss separation, after bell mouth and toper boss, only need hold the handle and can drive the removal of back boring bar.

In the boring machine, the front boring bar is internally provided with lightening holes along the axial direction, and the lightening holes are communicated with the threaded holes. The setting of lightening hole can reduce the weight of preceding boring bar as far as possible under the prerequisite of boring bar structural strength before guaranteeing, moreover, because be interference fit between bell mouth and the toper boss, when both peg graft, the air in the bell mouth can get into the lightening hole through the screw hole, avoids influencing the cooperation precision because of there being the air in the bell mouth.

In foretell boring machine, have the shaft hole of relative setting respectively on inner support seat and the outer support seat, be equipped with a plurality of locating pieces on the terminal surface of outer support seat towards the inner support seat, the locating piece encircles the shaft hole interval and sets up, be equipped with a plurality of ejector pin subassemblies that are used for pressing from both sides tight work piece with the locating piece cooperation on the inner support seat, the ejector pin subassembly encircles the shaft hole interval and sets up and outwards support seat one side protrusion. One end of the workpiece is abutted against the positioning block in a fitting manner, and the ejector rod assembly abuts against the end face of the other end of the workpiece, so that the workpiece is fixed in the boring die.

In the boring machine, the inner supporting seat is provided with a plurality of guide holes which correspond to the ejector rod assemblies one by one, each ejector rod assembly comprises an ejector rod, a screw rod and a guide sleeve, the ejector rods penetrate through the guide holes, one ends of the ejector rods, facing the outer supporting seat, extend out of the guide holes, a cavity for accommodating a boring cutter is formed between the ends, extending out of the outer supporting seat, of the ejector rods, the guide sleeves are fixedly arranged on one sides, far away from the outer supporting seat, of the inner supporting seat and are coaxial with the guide holes, and the screw rods are in threaded connection with the guide sleeves and are coaxially connected with the ejector rods. Therefore, the ejector rod can be adjusted in position through the screw rod, the ejector rod is matched with the positioning block to clamp a workpiece, and when the ejector rod is arranged to enable the workpiece to be fixed between the inner supporting seat and the outer supporting seat, a space for accommodating the boring cutter is formed between the workpiece and the inner supporting seat, so that the front boring rod can be smoothly drawn out of the workpiece, and interference of the front boring rod on the assembly and disassembly of the workpiece is avoided.

In the boring machine, the boring jig further comprises a base, the inner supporting seat and the outer supporting seat are fixedly arranged on the base, a plurality of supports which are adjustable in height and used for supporting the workpiece are arranged on the upward end face of the base at intervals, and the supports are located between the inner supporting seat and the outer supporting seat. The height of the support is adjustable, so that the support can adapt to workpieces with different sizes, and the matching precision of the prefabricated hole of the workpiece fixed to the boring jig and the boring bar is ensured.

In the boring machine, the end face of the positioning block facing the ejector rod assembly is provided with mounting grooves, the mounting grooves are internally provided with positioning pins and springs pushing the positioning pins outwards, the mounting grooves are internally and fixedly provided with glands for sealing the mounting grooves, the glands are provided with abdicating holes, and one ends of the positioning pins penetrate through the abdicating holes and extend out of the mounting grooves. The positioning pin is arranged to ensure that the workpiece can be kept in a fixed state when the ejector rod is not completely in place in the fixing process, so that the position deviation generated in the fixing process of the workpiece is avoided, and the positioning precision of the workpiece is ensured.

Compared with the prior art, the utility model has the advantages of it is following:

1. the utility model discloses a structure of connection can be dismantled to boring bar and back boring bar before the boring bar adopts, preceding boring bar and back boring bar cooperate with the inner support seat and the outer support seat of boring jig respectively, and boring bar and back boring bar can move in opposite directions at the loading and unloading in-process of work piece before making, make the boring bar need not to take out completely from the boring jig and can load and unload the work piece, avoided loading and unloading work piece at every turn all to need the operation of dismouting boring cutter, has both improved the loading and unloading efficiency of work piece, has guaranteed the cooperation precision between boring bar and the boring cutter again.

2. The utility model discloses a boring bar passes through the bell mouth before the boring bar adopts and the cooperation of toper boss interference grafting guarantees that connection accuracy rethread pull rod threaded connection is fixed with back boring bar, makes the pull rod through revolve when revolving boring bar and back boring bar before fixed, can not produce relative slip between bell mouth and the toper boss, only receives between bell mouth and the toper boss along the radial pressure of boring bar, and the cooperation between bell mouth and the toper boss is more accurate. And be provided with the handle on the pull rod, when boring bar and back boring bar before the split, can make the bell mouth and the separation of toper boss of tight fit through the strike face of striking on the handle, easy operation is convenient.

3. The inner supporting seat and the outer supporting seat are respectively provided with an ejector rod assembly and a positioning block for clamping and fixing two end faces of a workpiece, and the workpiece is positioned by adopting the structure, so that a space for accommodating a boring cutter is formed between the workpiece and the inner supporting seat, the front boring bar can be smoothly drawn out from the workpiece, and the interference of the front boring bar on the loading and unloading of the workpiece is avoided.

Drawings

FIG. 1 is a schematic structural view of the boring machine when fixing a workpiece;

FIG. 2 is a schematic view of the construction of a boring bar;

FIG. 3 is an enlarged view of portion a of FIG. 2;

FIG. 4 is an enlarged view of portion b of FIG. 2;

FIG. 5 is a schematic view of the structure of the workpiece secured within the boring die;

FIG. 6 is a schematic structural view of a workpiece during loading and unloading in a boring die;

FIG. 7 is a schematic structural view of the outer support base;

FIG. 8 is a cross-sectional view of the locating block;

FIG. 9 is a schematic view of the construction of the inner support base;

fig. 10 is a schematic structural view of the jack assembly.

In the figure, 1, a frame; 2. a power plant; 3. boring a mold; 31. an inner supporting seat; 31a, a guide hole; 32. an outer support base; 3a, a shaft hole; 3b, bearing bushes; 33. a base; 33a, a support; 4. boring a rod; 41. a front boring bar; 41a, a tapered hole; 41b, a threaded hole; 41c, lightening holes; 42. a rear boring bar; 42a, a through hole; 42b, a conical boss; 43. a pull rod; 43a, an abutting portion; 43b, a baffle ring; 43c, a handle; 43d, knocking surface; 5. boring cutter; 51. a cutter head; 52. a cutter head; 6. a push rod assembly; 61. a top rod; 62. a screw; 63. a guide sleeve; 71. positioning blocks; 71a, a mounting groove; 72. positioning pins; 73. a gland; 74. a spring; 8. and (5) a workpiece.

Detailed Description

The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

As shown in figures 1 to 6, the boring machine is mainly used for processing large and long holes of large workpieces 8 such as a screw 62 pump body or a Roots pump body and comprises a frame 1, a power device 2, a boring jig 3 and a boring rod 4, the power device 2 is transversely arranged on the rack 1 in a sliding mode, the boring jig 3 is arranged on the rack 1 and is opposite to the power device 2, the boring jig 3 comprises an inner supporting seat 31 and an outer supporting seat 32 which are arranged at intervals, the boring rod 4 comprises a front boring rod 41 and a rear boring rod 42 which are detachably and coaxially connected in an inserting mode, the front boring rod 41 penetrates through the inner supporting seat 31, the rear boring rod 42 penetrates through the outer supporting seat 32, one end of the front boring rod 41 is connected with an output shaft of the power device 2, the front boring rod 41 and the rear boring rod 42 are fixedly connected with the front boring rod 41 in a threaded mode through a pull rod 43 penetrating through the rear boring rod 42, and a boring cutter 5 is arranged on the periphery of one end, close to the rear boring rod 42, of the front boring rod 41. When the workpiece 8 is disassembled, the front boring bar 41 and the rear boring bar 42 can be disassembled, so that the workpiece 8 can be conveniently taken and placed, and the boring cutter 5 is prevented from being disassembled.

Specifically, as shown in fig. 1 to 4, a guide rail is transversely arranged on a frame 1, a power device 2 is slidably arranged on the guide rail, a driving device for driving the power device 2 to move along the guide rail is arranged on the frame 1, the power device 2 comprises a driving motor and a transmission mechanism located below the driving motor, the transmission mechanism can be a reduction gearbox or a belt pulley transmission mechanism, the transmission mechanism is provided with a transmission shaft arranged along the length direction of the guide rail, and the power device 2 can drive the transmission shaft to rotate. The boring bar 4 comprises a front boring bar 41 and a rear boring bar 42 which are long bar-shaped, wherein the end surface of the front boring bar 41 facing the rear boring bar 42 is provided with a tapered hole 41a, the bottom of the tapered hole 41a is provided with a threaded hole 41b, the end surface of the rear boring bar 42 facing the front boring bar 41 is provided with a tapered boss 42b which is in interference fit with the tapered hole 41a, the rear boring bar 42 is axially provided with a through hole 42a which penetrates through the tapered boss 42b, a pull rod 43 penetrates through the through hole 42a, the diameter of the pull rod 43 is smaller than the inner diameter of the through hole 42a, both ends of the pull rod 43 extend out of the through hole 42a, one end of the pull rod 43 facing the front boring bar 41 is provided with an external thread, one end of the pull rod 43 far away from the front boring bar 41 is provided with an abutting part 43a, the diameter of the abutting part 43a is larger than that of the through hole 42a, so that the front boring bar 41 and the rear boring bar 42 are connected with the threaded hole 41b of the front, the abutting part 43a can abut against one end face of the front boring bar 41, so that the stability of connection between the front boring bar 41 and the rear boring bar 42 is ensured, and relative rotation between the tapered boss 42b and the tapered hole 41a is avoided when the front boring bar 41 and the rear boring bar 42 are connected. In this embodiment, the taper angles of the tapered hole 41a and the tapered boss 42b are 3 ° to 10 °. Of course, a washer may be disposed between the abutting portion 43a and the rear boring bar 42 to ensure the stability of the connection.

A stop ring 43b is further sleeved and fixed at one end of the pull rod 43 in threaded connection with the front boring rod 41, the stop ring 43b is located on the outer side of the through hole 42a, the outer diameter of the stop ring 43b is larger than the inner diameter of the through hole 42a, meanwhile, the length of the tapered hole 41a is larger than that of the tapered boss 42b, the stop ring 43b can be located between the bottom wall of the tapered hole 41a and the tapered boss 42b after the tapered hole 41a and the tapered boss 42b are in plug-in fit, a handle 43c is coaxially and fixedly connected to the end portion of the pull rod 43 with one end of the abutting portion 43a, the handle 43c is columnar, a distance is reserved between the handle 43c and the rear boring rod 42, and the diameter of the handle 43c is larger than that of the pull rod 43 so that a striking surface 43d for a hammer is formed at one. After the pull rod 43 and the front boring rod 41 are separated by screwing, the tapered hole 41a and the tapered boss 42b are still in a tight connection state due to interference fit, and at the moment, the striking surface 43d of the handle 43c is struck by a tool such as a mallet, so that the force of the mallet can be transmitted to the abutting part 43a, the tapered hole 41a and the tapered boss 42b are separated, and then the handle 43c part of the pull rod 43 is pulled by hand, so that the front boring rod 41 and the rear boring rod 42 can be separated. In order to facilitate the screwing of the pull rod 43, the cross section of the end of the pull rod 43 provided with the handle 43c, the cross section of the handle 43c and the cross section of the abutting part 43a can adopt a polygonal structure such as a regular hexagon.

Furthermore, a lightening hole 41c is formed in the front boring bar 41 along the axial direction, and the lightening hole 41c is communicated with the threaded hole 41b, so that the weight of the front boring bar 41 is reduced on the premise of ensuring the structural strength of the front boring bar 41, and when the tapered hole 41a is inserted into the tapered boss 42b, air in the tapered hole 41a can enter the lightening hole 41c through the threaded hole 41b, thereby avoiding the air from influencing the matching between the tapered hole 41a and the tapered boss 42 b.

In this embodiment, the boring cutter 5 includes an annular cutter disc 51 and cutter heads 52 arranged at intervals along the circumferential direction of the cutter disc 51, wherein the cutter disc 51 is sleeved and fixed on one end of the front boring bar 41 close to the rear boring bar 42.

As shown in fig. 5 to 10, the boring jig 3 includes a base 33, an inner support 31 and an outer support 32, wherein the base 33 is disposed at one end of the frame 1, the inner support 31 and the outer support 32 are disposed at two ends of the base 33 at intervals along the length direction of the boring bar 4, the inner support 31 is located at one end close to the power device 2, and the outer support 32 is located at one end far from the power device 2. A plurality of height-adjustable bearings 33a for supporting the workpiece 8 are arranged on the upward end surface of the base 33 at intervals, and the bearings 33a are all positioned between the inner supporting seat 31 and the outer supporting seat 32. In this embodiment, the four supports 33a are arranged in a square shape. The inner support seat 31 and the outer support seat 32 are distributed with shaft holes 3a which are oppositely arranged, the positions and the number of the shaft holes 3a correspond to the prefabricated holes of the workpiece 8, in the embodiment, the workpiece 8 is a pump body of a twin-screw 62 pump, so the number of the shaft holes 3a on the inner support seat 31 and the outer support seat 32 are two, the front boring bar 41 is arranged in the shaft hole 3a of the inner support seat 31 in a penetrating manner, the rear boring bar 42 is arranged in the shaft hole 3a of the outer support seat 32 in a penetrating manner, and in order to ensure the accuracy and the smooth movement of the front boring bar 41 and the rear boring bar 42, the front boring bar 41 and the rear boring bar 42 are respectively matched with the shaft holes 3a through a bearing bush 3 b.

The end surface of the outer support seat 32 facing the inner support seat 31 is provided with a plurality of positioning blocks 71, the positioning blocks 71 are arranged around the shaft hole 3a at intervals, in this embodiment, the number of the positioning blocks 71 is three, and of course, both the number and the shape of the positioning blocks 71 can be designed according to the actual shape of the workpiece 8. The inner support seat 31 is provided with a plurality of ejector rod assemblies 6 and a plurality of guide holes 31a corresponding to the ejector rod assemblies 6 one by one, the guide holes 31a are also arranged along the axial direction of the boring bar 4 and distributed around the shaft hole 3a, as shown in fig. 10, the ejector rod assemblies 6 comprise ejector rods 61, screw rods 62 and guide sleeves 63, the ejector rods 61 are arranged in the guide holes 31a in a penetrating manner, one ends of the ejector rods 61 extending out of the guide holes 31a towards one ends of the outer support seats 32 extend out of the guide holes 31a, a cavity for accommodating the boring cutter 5 is formed between the ends of the ejector rods 61 extending out of the outer support seats 32, the guide sleeves 63 are fixedly arranged on one side of the inner support seat 31 far away from the outer support seats 32 and are coaxial with the guide holes 31a, the screw rods 62 are in threaded connection with the guide sleeves 63 and are coaxially connected with the ejector rods 61, and the screw.

Further, as shown in fig. 8, an installation groove 71a is formed in the end surface of the positioning block 71 facing the push rod assembly 6, a positioning pin 72 and a spring 74 pushing the positioning pin 72 outwards are arranged in the installation groove 71a, a gland 73 covering the installation groove 71a is further fixedly arranged in the installation groove 71a, a yielding hole is formed in the gland 73, one end of the positioning pin 72 penetrates through the yielding hole and extends out of the installation groove 71a, and meanwhile, the gland 73 can limit the positioning pin 72 to prevent the positioning pin 72 from being separated from the installation groove 71 a. Therefore, after the workpiece 8 is placed in the positioning device and the ejector rod 61 is not fixed in place, a certain pre-tightening force can be formed between the positioning pin 72 and the ejector rod 61, the workpiece 8 is prevented from sliding in the fixing process, and the positioning accuracy of the workpiece 8 is guaranteed.

When the boring machine is used for processing a workpiece 8, a front boring bar 41 is separated from a rear boring bar 42, a power device 2 moves towards a direction far away from an outer support seat 32 and drives the front boring bar 41 to move, so that a boring cutter 5 on the front boring bar 41 enters a cavity between ejector rods 61, the rear boring bar 42 is manually pulled and also moves towards a direction far away from the front boring bar 41, a space enough for the workpiece 8 to be placed is formed between an inner support seat 31 and the outer support seat 32, then the workpiece 8 is placed on each support 33a, one end face of the workpiece 8 is abutted against a positioning block 71 on the outer support seat 32, a screw 62 on the inner support seat 31 is adjusted, so that the ejector rod 61 is abutted against the other end face of the workpiece 8 and fixes the workpiece 8, then the rear boring bar 42 moves towards one end of the front boring bar 41, the rear boring bar 42 penetrates through a prefabricated hole of the workpiece 8 and is inserted into the front boring bar 41, and then the front boring bar 41 is stably and fixedly connected with the rear boring bar 42 by screwing a pull rod 43, thus, the fixing of the workpiece 8 and the installation of the boring bar 4 are completed, and at the moment, the boring cutter 5 on the boring bar 4 can bore the prefabricated hole of the workpiece 8 only by driving the power device 2 to enable the boring bar 4 to rotate and simultaneously transmit the feeding force moving towards one end of the outer supporting seat 32 to the boring bar 4. Similarly, after the machining is completed, the pull rod 43 is screwed to separate the pull rod 43 from the front boring bar 41, then the striking surface 43d of the handle 43c is struck by a hammer to separate the front boring bar 41 from the rear boring bar 42, the front boring bar 41 and the rear boring bar 42 are pulled out from the workpiece 8, and then the workpiece 8 can be taken out by loosening the ejector rod 61.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Although the terms frame 1, power unit 2, boring die 3, inner support 31, outer support 32, base 33, boring bar 4, etc. are used more herein, the possibility of using other terms is not excluded. These terms are used merely to more conveniently describe and explain the nature of the present invention; they are to be construed in a manner that is inconsistent with the spirit of the invention.

Claims (10)

1. A boring machine comprises a rack (1), a boring rod (4), a power device (2) arranged on the rack (1) in a sliding mode and a boring jig (3) which is arranged opposite to the power device (2) and used for fixing a workpiece (8), wherein the boring jig (3) comprises an inner supporting seat (31) and an outer supporting seat (32) which are arranged at intervals, the boring machine is characterized in that the boring rod (4) comprises a front boring rod (41) and a rear boring rod (42) which are detachably and coaxially connected in an inserting mode, the front boring rod (41) is arranged on the inner supporting seat (31) in a penetrating mode, the rear boring rod (42) is arranged on the outer supporting seat (32) in a penetrating mode, one end of the front boring rod (41) is connected with an output shaft of the power device (2), the rear boring rod (42) is provided with a through hole (42a) in the axial direction, a pull rod (43) is arranged in the through hole (42a) in a penetrating mode, and two ends of the pull rod (43) extend out, one end of the pull rod (43) is provided with an external thread and is in threaded connection with the front boring rod (41), the other end of the pull rod (43) is provided with an abutting part (43a) for abutting against the end face of the rear boring rod (42), and a boring cutter (5) is arranged on the front boring rod (41) in the circumferential direction close to one end of the rear boring rod (42).

2. The boring machine as claimed in claim 1, characterized in that the end face of the front boring bar (41) facing the rear boring bar (42) is provided with a tapered hole (41a), the bottom of the tapered hole (41a) is provided with a threaded hole (41b) in threaded connection with the pull rod (43), and the end face of the rear boring bar (42) facing the front boring bar (41) is provided with a tapered boss (42b) in interference fit with the tapered hole (41 a).

3. The boring machine according to claim 2, characterized in that the tie rod (43) is in the shape of an elongated cylinder, the diameter of the tie rod (43) being smaller than the inner diameter of the through hole (42a), the outer diameter of the abutment (43a) being larger than the inner diameter of the through hole (42 a).

4. The boring machine as claimed in claim 3, wherein the length of the tapered hole (41a) is greater than that of the tapered boss (42b), a retaining ring (43b) is further sleeved and fixed at one end of the pull rod (43) in threaded connection with the front boring rod (41), the retaining ring (43b) is located on the outer side of the through hole (42a), and the outer diameter of the retaining ring (43b) is greater than the inner diameter of the through hole (42 a).

5. The boring machine as claimed in claim 4, characterized in that the end of the pull rod (43) having one end abutting against the part (43a) is coaxially connected with a handle (43c), the handle (43c) is columnar, the handle (43c) is spaced from the rear boring rod (42), the diameter of the handle (43c) is larger than the outer diameter of the pull rod (43) so that the end of the handle (43c) facing the through hole (42a) forms a striking surface (43d) for striking by a hammer.

6. The boring machine as claimed in claim 2 or 3 or 4 or 5, characterized in that the front boring bar (41) is provided with lightening holes (41c) along the axial direction, and the lightening holes (41c) are communicated with the threaded holes (41 b).

7. The boring machine as claimed in claim 6, characterized in that the inner support (31) and the outer support (32) are respectively provided with oppositely arranged shaft holes (3a), the end surface of the outer support (32) facing the inner support (31) is provided with a plurality of positioning blocks (71), the positioning blocks (71) are arranged around the shaft holes (3a) at intervals, the inner support (31) is provided with a plurality of ejector rod assemblies (6) which are matched with the positioning blocks (71) and used for clamping the workpiece (8), and the ejector rod assemblies (6) are arranged around the shaft holes (3a) at intervals and protrude towards one side of the outer support (32).

8. The boring machine as claimed in claim 7, characterized in that the inner support base (31) is provided with a plurality of guide holes (31a) corresponding to the push rod assemblies (6) one by one, the push rod assemblies (6) comprise push rods (61), screw rods (62) and guide sleeves (63), the push rods (61) are arranged in the guide holes (31a) in a penetrating manner, one ends of the push rods (61) extend out of the guide holes (31a) towards one ends of the outer support bases (32), a cavity for accommodating the boring cutter (5) is formed between the ends of the push rods (61) extending out of the outer support bases (32), the guide sleeves (63) are fixedly arranged on one side of the inner support base (31) far away from the outer support bases (32) and are coaxial with the guide holes (31a), and the screw rods (62) are in threaded connection with the guide sleeves (63) and are coaxially connected with the push rods (61).

9. The boring machine as claimed in claim 8, characterized in that the boring die (3) further comprises a base (33), the inner support (31) and the outer support (32) are both fixedly arranged on the base (33), a plurality of supports (33a) with adjustable height for supporting the workpiece (8) are arranged on the upward end surface of the base (33) at intervals, and the supports (33a) are both positioned between the inner support (31) and the outer support (32).

10. The boring machine as claimed in claim 9, wherein an installation groove (71a) is formed in an end face of the positioning block (71) facing the ejector rod assembly (6), a positioning pin (72) and a spring (74) pushing the positioning pin (72) outwards are arranged in the installation groove (71a), a gland (73) covering the installation groove (71a) is further fixedly arranged in the installation groove (71a), a relief hole is formed in the gland (73), and one end of the positioning pin (72) penetrates through the relief hole and extends out of the installation groove (71 a).

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