Pipe fitting interior grinding equipment for engineering machinery

Abstract

The invention belongs to the technical field of intelligent grinding devices, and particularly relates to pipe fitting interior grinding equipment for engineering machinery. Comprising a polisher; the grinding machine comprises a workbench. A stabilizing mechanism is mounted on the workbench; the stabilizing mechanism comprises a bottom plate; two U-shaped seats are arranged above the bottom plate; threaded grooves are formed in the two U-shaped bases. Screw rods are in threaded engagement with the interiors of the threaded grooves; a gear shaft is fixed at the top of the screw rod; a U-shaped plate is arranged above the gear shaft; two arc-shaped blocks are fixed at the top of the U-shaped plate; a worm is rotationally arranged in the U-shaped seat; the two worms are connected through a connecting rod; a plurality of supporting assemblies are arranged between the two U-shaped seats; by arranging the stabilizing mechanism, the situation that the contact pressure between the inner ring and the grinding roller is periodically suddenly changed due to radial jumping of a pipe fitting, and consequently over-grinding and under-grinding of the local area of the inner ring occur alternately can be avoided.

Description

Technical Field

[0001] This invention belongs to the field of intelligent grinding device technology, specifically a grinding device for the internal grinding of pipe fittings used in engineering machinery. Background Technology

[0002] As core components in fluid transportation, engineering machinery, petrochemicals, and other fields, tubular workpieces rely heavily on the machining accuracy and surface quality of their inner rings. This directly determines the workpiece's assembly compatibility, fluid transmission performance, and service life. After tubular fittings are formed, the inner rings are prone to residual machining allowances and cutting burrs, and are susceptible to internal surface corrosion during storage and transportation. Without precision machining, these burrs and corrosion can cause fluid turbulence and exacerbate wear on mating parts. Furthermore, excessive surface roughness can directly affect the sealing performance of the sealing surface. Therefore, inner ring grinding is a crucial step in the precision machining of tubular fittings.

[0003] The existing pipe fitting inner ring grinding equipment has integrated the core module of intelligent manufacturing. It adopts a process scheme in which a servo linkage roller drive rotation mechanism and a CNC feed grinding unit work together to realize the automation and precise control of the grinding process. During the grinding operation, the pipe to be processed is precisely placed on the two parallel support rollers of the equipment by the feeding mechanism. The top of the pipe is fitted with two sets of active drive wheels. The support rollers and drive wheels form a four-point centering clamping structure. The rotation speed of the rollers and drive wheels is synchronously controlled by the frequency conversion servo system, which drives the pipe to rotate at a uniform speed and in a stable circumferential direction. The CNC slide of the equipment is equipped with a high-precision servo motor. The output end of the motor is connected to a high-rigidity transmission shaft. The grinding roller is fixed at the end of the shaft. The CNC slide is driven by the precise instructions of the PLC control system and moves at a constant speed or with a variable feed along the axial direction of the pipe. This drives the grinding roller to smoothly extend into the inner circle of the pipe. The high-speed rotation of the grinding roller and the circumferential rotation of the pipe form a compound grinding motion, which completes the grinding and finishing of the entire length of the inner circle of the pipe. The whole set of equipment integrates intelligent manufacturing technologies such as CNC positioning, real-time stroke monitoring, and intelligent parameter adjustment, which greatly improves the automation level and processing efficiency of the grinding operation.

[0004] However, if irregular protrusions such as raised rust spots, weld points, and hard impurities remain on the outer surface of the pipe fitting, during the rotation of the pipe fitting driven by the support roller and drive wheel, when these protrusions move circumferentially with the pipe fitting to the contact position with the roller or drive wheel, the height of the protrusion will create a rigid pushing effect, instantly lifting the pipe fitting upwards. This directly disrupts the stable clamping state of the four-point centering, causing the pipe fitting to produce periodic radial runout and irregular high-frequency vibration. The radial runout of the pipe fitting causes periodic abrupt changes in the contact pressure between the inner ring and the grinding roller, resulting in alternating over-grinding and under-grinding in local areas of the inner ring. This leads to poor surface roughness consistency and out-of-tolerance cylindricity of the inner ring after grinding, severely reducing the processing accuracy of the pipe fitting. At the same time, high-frequency vibration also affects the speed stability of the servo drive system and the axial feed positioning accuracy of the CNC slide, resulting in a decrease in the overall processing stability of the equipment. It may even cause rigid collisions between the grinding roller and the pipe fitting end, causing problems such as chipping of the pipe fitting end and damage to the grinding roller, significantly increasing the production defect rate and equipment maintenance costs. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies and solve the above-mentioned technical problems, this invention proposes an internal grinding device for pipe fittings in engineering machinery. By setting up a stabilizing mechanism, it can avoid the radial runout of the pipe fitting causing periodic abrupt changes in the contact pressure between the inner ring and the grinding roller, resulting in alternating over-grinding and under-grinding in local areas of the inner ring; the specific structure is as follows;

[0006] An internal grinding device for pipe fittings in engineering machinery includes a grinding machine, and the grinding machine is equipped with a grinding mechanism and a drive mechanism; the grinding machine includes a worktable;

[0007] A stabilizing mechanism is installed on the workbench; the stabilizing mechanism includes a base plate; two U-shaped seats are provided above the base plate;

[0008] Both U-shaped seats have threaded grooves inside, and the threaded grooves extend into the base plate; each threaded groove is threaded with a screw, and a limit ring is fixed on the screw;

[0009] A gear shaft is fixed to the top of the screw; a U-shaped plate is provided above the gear shaft, and the gear shaft rotates on the U-shaped plate; two arc-shaped blocks are fixed to the top of the U-shaped plate, and rollers rotate at the bottom of each arc-shaped block.

[0010] A worm gear rotates inside the U-shaped seat and meshes with a gear shaft; the two worm gears are connected by a connecting rod; one of the worm gears is driven by a first motor.

[0011] Multiple support components are provided between the two U-shaped seats, and the number of support components is four or more; each support component includes two upright plates; each upright plate has an n-shaped groove, and a connecting rod passes through the n-shaped groove;

[0012] An arc-shaped plate is provided between the two upright plates; two rotating balls are located on the top of the arc-shaped plate, and the two rotating balls are used to place the pipe to be polished; sliders are fixed on both sides of the arc-shaped plate.

[0013] Both of the upright plates have grooves on the side facing the slider, and the slider slides in the grooves; the bottom of the slider is connected to a spring, and the other side of the spring is fixed in the groove.

[0014] In a preferred embodiment of the present invention, a grinding mechanism is provided on the left side of the stabilizing mechanism; the grinding mechanism includes a slide block, which is driven by a lead screw; a second motor is mounted on the slide block, and a rotating shaft is mounted on the second motor; a mounting shaft is fixed to the end of the rotating shaft, and a grinding wheel is mounted on the mounting shaft by a locking nut;

[0015] The stabilizing mechanism is equipped with a driving mechanism at its top; the driving mechanism includes an n-shaped frame; there are two driving wheels inside the n-shaped frame that rotate via a driving rod, and the driving wheels are made of elastic rubber material and are driven by a third motor; hydraulic cylinders are installed on both sides of the n-shaped frame.

[0016] In a preferred embodiment of the present invention, each of the arc-shaped plates has a fixing compartment at its bottom, and the opening of the fixing compartment faces downward.

[0017] A top block slides inside the fixed chamber, and the top block slides within the fixed chamber via a spring; a semi-circular groove is provided at the bottom of the top block, and a connecting rod passes through the semi-circular groove.

[0018] In a preferred embodiment of the present invention, the connecting rod surface is provided with toothed grooves;

[0019] A limiting wheel rotates within the semi-circular groove of the top block, and the limiting wheel meshes with the tooth groove.

[0020] In a preferred embodiment of the present invention, each of the support components is provided with two rotating cylinders between the two upright plates, and the rotating cylinders rotate on one of the upright plates;

[0021] Two straight rods are fixed between the two U-shaped seats, and both straight rods pass through the vertical plate without a rotating cylinder and through the rotating cylinder;

[0022] The inner ring of the rotating drum is threaded, and the straight rod located inside the rotating drum is also threaded on one side that meshes with the inner ring of the rotating drum.

[0023] The outer ring surface of the rotating drum is fixed with ratchet teeth; the bottom of the fixed chamber is fixed with a U-shaped frame, and the connecting rod passes through the U-shaped frame;

[0024] The bottom of the U-shaped frame is fixed with two fixing plates, which are located on the left side of the two rotating cylinders respectively. The two fixing plates are hinged with pawls on the side facing the ratchet, and the pawls engage with the ratchet when they move down and rotate when they move up.

[0025] In a preferred embodiment of the present invention, an auxiliary mechanism is installed on the U-shaped plate near the grinding mechanism;

[0026] The auxiliary mechanism includes two side plates; a slide rail is provided on one side of the two side plates opposite each other; a driven plate slides between the two side plates;

[0027] The driven plate has protrusions on both sides, and the protrusions slide in the slide rail; a first U-shaped block is fixed on the top of the driven plate, and the first U-shaped block is located on the side of the top of the driven plate away from the grinding mechanism, and the mounting shaft is located inside the first U-shaped block;

[0028] The driven plate has evenly arranged ball bearings rotating at its bottom; the first U-shaped block also has ball bearings rotating at its top.

[0029] In a preferred embodiment of the present invention, an air groove is provided inside the driven plate, and the air groove is connected to an external vacuum cleaner through an air pipe.

[0030] The driven plate has a vertical groove at its bottom, and the vertical groove is located below the first U-shaped block; the side of the vertical groove has an inclined plate, and the inclined plate slides inside the driven plate;

[0031] The inclined plate has a rounded corner design on the side facing the stabilizing mechanism.

[0032] In a preferred embodiment of the present invention, a second U-shaped block is provided on the left side of the first U-shaped block;

[0033] The second U-shaped block also has rotating ball bearings on its top; the grinding wheel is located between the first and second U-shaped blocks; the rotating shaft passes through the inside of the second U-shaped block.

[0034] In a preferred embodiment of the present invention, the base plate includes a left plate and a right plate; the left plate and the right plate are internally threaded with a bidirectional lead screw, and the bidirectional lead screw is driven by a fourth motor;

[0035] Both the connecting rod and the straight rod include a left rod and a right rod; both the left rod and the right rod have rectangular grooves; and rectangular rods slide within the rectangular grooves of the left rod and the right rod, respectively.

[0036] The beneficial effects of this invention are as follows:

[0037] 1. The internal grinding equipment for pipe fittings in engineering machinery described in this invention uses a point-contact support method between a rotating ball and the pipe fitting through multiple sets of support components. This significantly reduces the probability of contact between the external protrusions of the pipe fitting and the support components. Compared with the surface contact of traditional rotating rollers, this method reduces the possibility of the protrusions causing push-off. When the protrusions on the pipe fitting contact the rotating ball, the spring elastic buffer structure of the support components can drive the arc plate to adaptively move downwards with the height of the protrusions. The synchronous bearing effect of multiple sets of support components can prevent the pipe fitting from shifting as a whole due to push-off from a single protrusion, achieving local buffering and overall stability. This can prevent the radial runout of the pipe fitting from causing periodic abrupt changes in the contact pressure between the inner ring and the grinding roller, resulting in alternating over-grinding and under-grinding in local areas of the inner ring. This leads to poor surface roughness consistency and excessive cylindricity of the inner ring after grinding, severely reducing the processing accuracy of the pipe fitting. At the same time, it can avoid rigid collisions between the grinding wheel and the pipe fitting end, preventing production losses such as edge chipping at the end and damage to the grinding wheel.

[0038] 2. The internal grinding equipment for pipe fittings in engineering machinery described in this invention involves idling the pipe fitting before grinding. When a protrusion on the pipe fitting contacts a rotating ball, it causes the arc-shaped plate and U-shaped frame to move downwards synchronously, triggering the meshing transmission of the pawl and ratchet. This drives the rotating drum to rotate along the straight rod thread, ultimately causing the vertical plate and rotating ball to move towards the center of the pipe fitting, achieving automatic misalignment between the rotating ball and the protrusion. Once the rotating ball and the protrusion are completely misaligned, the protrusion no longer contacts and pushes against the rotating ball during the rotation of the pipe fitting, fundamentally avoiding localized periodic vibrations caused by repeated compression of the rotating ball by a single protrusion during pipe rotation, further improving the stability of pipe rotation. Simultaneously, it can adaptively match irregular protrusions of different positions, heights, and numbers on the outer surface of the pipe fitting, eliminating the need for manual marking, positioning, or adjustment of the support position of the protrusions. This significantly simplifies the preparation process before grinding, reduces manual labor intensity, and improves overall work efficiency.

[0039] 3. The internal grinding equipment for pipe fittings in engineering machinery described in this invention utilizes a multi-segment limiting structure with a first U-shaped block through which the mounting shaft passes and a second U-shaped block through which the rotating shaft passes. Combined with the rolling support of the ball bearings at the top of the first and second U-shaped blocks, this structure supports the pipe fitting, counteracting the downward pressure generated when the drive wheel presses in, thus solving the problems of downward displacement and skew caused by the downward pressure of the drive wheel. Simultaneously, it supports the rotating shaft and mounting shaft, preventing jumps. Furthermore, the air groove, connected to an external vacuum cleaner via an air pipe, creates negative pressure, quickly extracting and discharging debris from the vertical groove. This prevents secondary cutting and scratch defects caused by debris accumulation between the grinding wheel and the inner ring, improving the surface finish of the inner ring. It also prevents dust from adhering to the outer ring surface of the workpiece, reducing subsequent cleaning processes and avoiding wear on the equipment's transmission components, thus lowering maintenance costs. Attached Figure Description

[0040] The invention will now be further described with reference to the accompanying drawings.

[0041] Figure 1 This is an overall view of the grinding machine of the present invention;

[0042] Figure 2 This is a structural diagram of the stabilizing mechanism and auxiliary mechanism in this invention;

[0043] Figure 3 This is a structural diagram of the auxiliary mechanism in this invention;

[0044] Figure 4 This is a structural diagram of the supporting component in this invention;

[0045] Figure 5 This is a top view of the grinding machine of the present invention;

[0046] Figure 6 This is the present invention. Figure 5 Sectional view at point AA;

[0047] Figure 7 This is the present invention. Figure 6 Enlarged view of a section at point B in the middle;

[0048] Figure 8 This is the present invention. Figure 7 Enlarged view of a section at point C;

[0049] Figure 9 This is the present invention. Figure 6 Sectional view at point DD;

[0050] Figure 10 This is the present invention. Figure 6 Sectional view at EE;

[0051] Figure 11 This is the present invention. Figure 10 Enlarged view of a section at point F in the middle;

[0052] Figure 12 This is the present invention. Figure 10 Enlarged view of a section at point G.

[0053] In the diagram: 1. Base plate; 11. U-shaped seat; 12. Threaded groove; 13. Screw; 14. Limiting ring; 15. Gear shaft; 16. U-shaped plate; 17. Arc-shaped block; 18. Roller; 19. Worm gear; 191. Connecting rod; 2. Vertical plate; 21. Arc-shaped plate; 22. Rotating ball; 23. Slider; 24. Fixed chamber; 25. Top block; 26. Limiting wheel; 3. Slide seat; 31. Rotating shaft; 32. 1. Mounting shaft; 33. Grinding wheel; 34. N-shaped frame; 35. Drive wheel; 36. Hydraulic cylinder; 37. Two-way lead screw; 38. Rectangular rod; 4. Rotary drum; 41. Racket; 42. Straight rod; 43. U-shaped frame; 44. Fixing plate; 45. Pawl; 5. Side plate; 51. Driven plate; 52. First U-shaped block; 53. Air groove; 54. Vertical groove; 55. Inclined plate; 56. Second U-shaped block. Detailed Implementation

[0054] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0055] like Figures 1 to 12 As shown, the internal grinding equipment for pipe fittings of engineering machinery according to the present invention, as an embodiment of the present invention, includes a grinding machine, and the grinding machine is equipped with a grinding mechanism and a driving mechanism; the grinding machine includes a worktable;

[0056] A stabilizing mechanism is installed on the workbench; the stabilizing mechanism includes a base plate 1; two U-shaped seats 11 are provided above the base plate 1;

[0057] The two U-shaped seats 11 have threaded grooves 12 inside, and the threaded grooves 12 extend into the base plate 1; each of the threaded grooves 12 is threaded with a screw 13, and a limit ring 14 is fixed on the screw 13.

[0058] A gear shaft 15 is fixed to the top of the screw 13; a U-shaped plate 16 is provided above the gear shaft 15, and the gear shaft 15 rotates on the U-shaped plate 16; two arc-shaped blocks 17 are fixed to the top of the U-shaped plate 16, and rollers 18 rotate at the bottom of each arc-shaped block 17.

[0059] A worm gear 19 rotates inside the U-shaped seat 11 and meshes with the gear shaft 15; the two worm gears 19 are connected by a connecting rod 191; one of the worm gears 19 is driven by a first motor.

[0060] Multiple support components are provided between the two U-shaped seats 11, and the number of support components is four or more; the support components include two upright plates 2; the upright plates 2 are provided with n-shaped grooves, and the connecting rod 191 passes through the n-shaped grooves;

[0061] An arc-shaped plate 21 is provided between the two upright plates 2; two rotating balls 22 are rotatable on the top of the arc-shaped plate 21, and the two rotating balls 22 are used to place the pipe to be polished; sliders 23 are fixed on both sides of the arc-shaped plate 21.

[0062] Both upright plates 2 have grooves on the side facing the slider 23, and the slider 23 slides in the grooves; the bottom of the slider 23 is connected to a spring, and the other side of the spring is fixed in the groove.

[0063] In this embodiment, a grinding mechanism is provided on the left side of the stabilizing mechanism; the grinding mechanism includes a slide 3, which is driven by a lead screw; a second motor is mounted on the slide 3, and a rotating shaft 31 is mounted on the second motor; a mounting shaft 32 is fixed to the end of the rotating shaft 31, and a grinding wheel 33 is mounted on the mounting shaft 32 by a locking nut;

[0064] The stabilizing mechanism is equipped with a driving mechanism at the top; the driving mechanism includes an n-shaped frame 34; there are two driving wheels 35 inside the n-shaped frame 34 that rotate via a driving rod, and the driving wheels 35 are made of elastic rubber material and are driven by a third motor; hydraulic cylinders 36 are installed on both sides of the n-shaped frame 34.

[0065] During implementation, when grinding the pipe fitting, firstly, place one side of the pipe fitting on the arc plate 21 near one side of the arc block 17, and push the pipe fitting towards the side near the arc block 17, so that the arc block 17 extends into the pipe fitting. Then, flatten the pipe fitting and move it towards the other side of the arc block 17, so that the arc block 17 on the other side extends into the pipe fitting. At this time, the pipe fitting is located on the rotating ball 22 above the multiple arc plates 21. Then, control the first motor to rotate. The rotating first motor will drive the two worm gears 19 and the connecting rod 191 to rotate. Since the worm gears 19 mesh with the gear shafts 15 above the two U-shaped seats 11, they will drive the two gear shafts 15 to rotate simultaneously. The screw 13 located below the gear shafts 15 is threaded into the thread groove of the U-shaped seat 11. As the screw 13 gradually rotates into the threaded groove 12, it will simultaneously drive the U-shaped plate 16 and the two arc-shaped blocks 17 above the U-shaped plate 16 to move downwards. The rollers 18 at the bottom of the moving arc-shaped blocks 17 will gradually contact the inside of the pipe. When the rollers 18 contact the inside of the pipe, they will continue to move downwards and push the entire pipe downwards. The moving pipe will push the arc-shaped plate 21 downwards. The moving arc-shaped plate 21 will drive the slider 23 to slide in the groove and squeeze the spring. During the process of the screw 13 gradually rotating into the threaded groove 12, it will drive the limiting ring 14 to move downwards. When the limiting ring 14 is in contact with the inside of the U-shaped seat 11, the first motor will be controlled to stop rotating. At this time, the pipe is clamped between the arc-shaped blocks 17 and the arc-shaped plate 21, and then the pipe can be polished.

[0066] Specifically, during the grinding of the pipe fitting, the hydraulic cylinder 36 is controlled to move the n-shaped frame 34 downward, thereby causing the drive wheel 35 to come into contact with the top surface of the pipe fitting. Then, the third motor drives the drive wheel 35 to rotate. The rotating drive wheel 35 causes the pipe fitting to rotate on the rotating balls 22 above the multiple arc plates 21 and the rollers 18 at the bottom of the two arc blocks 17. Because the drive wheel 35 is made of elastic rubber, when the protrusions on the surface of the pipe fitting pass over the drive wheel 35, the protrusions will sink into the drive wheel 35, thus preventing the pipe fitting from shaking. Then, the second motor is controlled to drive the mounting shaft 32 via the rotating shaft 31. The grinding wheel 33 rotates, and the direction of the grinding wheel 33 is opposite to that of the pipe fitting. At the same time, the slide block 3 is controlled by the lead screw to gradually approach the pipe fitting. The slide block 3 will drive the rotating shaft 31 and the grinding wheel 33 to gradually extend into the pipe fitting and contact the top of the inner ring of the pipe fitting. This allows the rotating grinding wheel 33 to grind the inner ring of the rotating pipe fitting, thus achieving the grinding of the inner ring of the pipe fitting. As the slide block 3 gradually drives the grinding wheel 33 to gradually extend into the pipe fitting, the inner wall of the pipe fitting can be ground in sequence. After the inner wall of the pipe fitting is ground, the slide block 3 is then controlled to return to the initial position, and the ground pipe fitting can be removed.

[0067] More specifically, because the rotating ball 22 above the arc plate 21 contacts the pipe, it presents a point contact, thereby reducing the contact area of ​​the pipe and the probability of the protrusions on the pipe contacting the rotating ball 22. This avoids the surface contact method used in the prior art when the rotating roller contacts the pipe, which easily leads to the protrusions on the pipe contacting the pipe and causing the pipe to jump or vibrate. If a protrusion on the pipe happens to contact the rotating ball 22 on the arc plate 21, since there are multiple support components, when the protrusion... When the point rotates to the position of the rotating ball 22, it will push the rotating ball 22 to move down. The moving rotating ball 22 will drive the arc plate 21 below to move down. The moving arc plate 21 will drive the slider 23 to slide in the groove and compress the spring. The other support components will support the tube, thereby preventing the tube from shifting downward and preventing the tube from jumping or vibrating. When the protrusion passes the rotating ball 22, the spring will push the slider 23, the arc plate 21 and the ring to return to the initial position.

[0068] Furthermore, by using multiple sets of support components with point contact support between the rotating ball 22 and the pipe fitting, the probability of contact between the outer protrusion of the pipe fitting and the support components is greatly reduced. Compared with the surface contact of the traditional rotating roller, the possibility of the protrusion causing push is reduced from the contact form. When the protrusion on the pipe fitting contacts the rotating ball 22, the spring elastic buffer structure of the support component can drive the arc plate 21 to move down adaptively with the height of the protrusion. Moreover, the synchronous bearing effect of multiple sets of support components can prevent the pipe fitting from shifting as a whole due to the push of a single protrusion, achieving local buffering and overall stability. This can prevent the radial runout of the pipe fitting from causing periodic abrupt changes in the contact pressure between the inner ring and the grinding roller, resulting in alternating over-grinding and under-grinding in local areas of the inner ring. This leads to poor surface roughness consistency and excessive cylindricity of the inner ring after grinding, which seriously reduces the processing accuracy of the pipe fitting. At the same time, it can avoid rigid collision between the grinding wheel 33 and the pipe fitting end, preventing production losses such as edge chipping at the end and damage to the grinding wheel 33.

[0069] As an embodiment of the present invention; each of the arc-shaped plates 21 has a fixing chamber 24 fixed at its bottom, and the opening of the fixing chamber 24 faces downward;

[0070] A top block 25 slides inside the fixed chamber 24, and the top block 25 slides inside the fixed chamber 24 by means of a spring; a semi-circular groove is provided at the bottom of the top block 25, and the connecting rod 191 passes through the semi-circular groove.

[0071] In this embodiment, the connecting rod 191 has toothed grooves on its surface;

[0072] The top block 25 has a rotatable limiting wheel 26 in its semi-circular groove, and the limiting wheel 26 meshes with the tooth groove.

[0073] During implementation, when the rotating ball 22 contacts the protrusion on the pipe fitting and is pushed downward by the protrusion, the downward-moving arc-shaped block 17 will drive the fixed chamber 24 and the sliding top block 25 inside the fixed chamber 24 to move downward. The downward-moving top block 25 will first contact the surface of the connecting rod 191. Subsequently, if the fixed chamber 24 continues to move downward, the top block 25 will slide inside the fixed chamber 24. When the top block 25 contacts the connecting rod 191, the limiting wheel 26 at the bottom of the top block 25 will engage in the tooth groove, thereby limiting the connecting rod 191 and preventing the pipe fitting from being damaged. When the convex point pushes the arc plate 21 downward, it will pull the arc block 17 upward due to the reaction force it bears. This will cause the screw 13 to rotate. By limiting the connecting rod 191, the screw 13 can be limited to avoid rotation. This will prevent the screw 13 from rotating and causing the arc block 17 to move, thereby changing the position of the pipe fitting and causing misalignment between the pipe fitting and the grinding wheel 33. This will result in alternating over-grinding and under-grinding in some areas of the inner ring of the pipe fitting.

[0074] As an embodiment of the present invention; two rotating cylinders 4 are provided between the two upright plates 2 of each support component, and the rotating cylinder 4 rotates on one of the upright plates 2;

[0075] Two straight rods 42 are fixed between the two U-shaped seats 11, and both straight rods 42 pass through the vertical plate 2 where the rotating cylinder 4 is not installed, and pass through the rotating cylinder 4;

[0076] The inner ring of the rotating drum 4 is threaded, and the straight rod 42 located inside the rotating drum 4 is also threaded on one side that meshes with the inner ring thread of the rotating drum 4.

[0077] A ratchet 41 is fixed on the outer ring surface of the rotating drum 4; a U-shaped frame 43 is fixed at the bottom of the fixed chamber 24, and the connecting rod 191 passes through the U-shaped frame 43;

[0078] The bottom of the U-shaped frame 43 is fixed with two fixing plates 44, and the fixing plates 44 are located on the left side of the two rotating cylinders 4 respectively; the two fixing plates 44 are hinged with pawls 45 on the side facing the ratchet 41, and the pawls 45 engage with the ratchet 41 when they move down, and rotate on their own when they move up.

[0079] During implementation, when the pipe fitting is confined between the arc-shaped block 17 and the arc-shaped plate 21, the drive wheel 35 is first controlled to contact the top surface of the pipe fitting. Then, the drive wheel 35 drives the pipe fitting to rotate freely between the arc-shaped block 17 and the arc-shaped plate 21. During this rotation, the outer ring of the pipe fitting will sequentially contact the rotating ball 22. If a protrusion on the surface of the pipe fitting pushes one or more rotating balls 22 downwards, the downward-moving rotating ball 22 will push the arc-shaped plate 21 downwards. The downward-moving arc-shaped plate 21 will drive the U-shaped frame 43 downwards, and the downward-moving U-shaped frame 43 will drive the fixing plate 44 with the pawl 45 to downwards. Since the pawl 45 meshes with the ratchet 41 on the rotating cylinder 4, and the outer ring of the rotating cylinder 4 rotates on one of the vertical plates 2, and the thread of the inner ring of the rotating cylinder 4 meshes with the thread of the straight rod 42 located inside the rotating cylinder 4, when the pawl 45 moves downwards, it will push the ratchet 45 downwards. The gear 41 and the rotating drum 4 rotate. The rotating drum 4 rotates along the thread. During the rotation of the rotating drum 4 along the thread, it will gradually move towards the middle position of the straight rod 42. At the same time, the moving rotating drum 4 will drive the vertical plate 2 to move along the straight rod 42. The vertical plate 2 will drive the arc plate 21 and the rotating ball 22 to move along the surface of the pipe towards the middle position of the pipe. This will allow the rotating ball 22 to gradually misalign with the protrusions on the surface of the pipe. When the protrusions on the pipe are completely misaligned with the rotating ball 22, the protrusions on the pipe cannot squeeze the rotating ball 22, thus preventing the protrusions from pushing the rotating ball 22 downward. At the same time, during the movement of the arc plate 21, it will drive the fixed chamber 24 and the top block 25 to move. Since the limiting wheel 26 set below the top block 25 rotates in the tooth groove, the friction of the limiting wheel 26 when it moves with the top block 25 can be reduced.

[0080] Specifically, if the arc plate 21 moves the rotating ball 22 and still contacts another protrusion on the surface of the pipe fitting, the above operation will be repeated again, and the arc plate 21 and the rotating ball 22 will continue to move through the rotating cylinder 4, and will be misaligned with the protrusion on the pipe fitting again. Since the straight rod 42 is also provided with a thread that meshes with the inner thread of the rotating cylinder 4 on one side inside the rotating cylinder 4, as the rotating cylinder 4 gradually rotates, the rotating cylinder 4 will gradually disengage from the thread on the straight rod 42 that was originally located inside the rotating cylinder 4. When the rotating cylinder 4 is completely disengaged from the thread, the rotating cylinder 4 itself will no longer move, thereby avoiding the situation where the rotating cylinder 4 keeps moving the arc plate 21 and causing the adjacent support components to collide.

[0081] More specifically, by allowing the pipe fitting to idle before grinding, if the protrusion on the pipe fitting contacts the rotating ball 22, it will drive the arc plate 21 and U-shaped frame 43 to move down synchronously, thereby triggering the meshing transmission of the pawl 45 and ratchet 41, driving the rotating cylinder 4 to rotate along the thread of the straight rod 42, and finally driving the vertical plate 2 and the rotating ball 22 to move towards the middle of the pipe fitting, realizing the automatic misalignment of the rotating ball 22 and the protrusion; when the rotating ball 22 and the protrusion are completely misaligned, the protrusion no longer contacts and pushes against the rotating ball 22 during the rotation of the pipe fitting, fundamentally avoiding the local periodic vibration caused by the repeated squeezing of the rotating ball 22 by a single protrusion as the pipe fitting rotates, further improving the stability of the pipe fitting rotation; at the same time, it can adaptively match irregular protrusions of different positions, heights and numbers on the outer surface of the pipe fitting, eliminating the need for manual marking, positioning or manual adjustment of the support position of the protrusions, greatly simplifying the preparation process before grinding, reducing the intensity of manual operation and improving the overall work efficiency.

[0082] As an embodiment of the present invention, an auxiliary mechanism is installed on the U-shaped plate 16 near the grinding mechanism;

[0083] The auxiliary mechanism includes two side plates 5; a slide rail is provided on one side of the two side plates 5 opposite to each other; a driven plate 51 slides between the two side plates 5;

[0084] The driven plate 51 has protrusions on both sides, and the protrusions slide in the slide rail; a first U-shaped block 52 is fixed on the top of the driven plate 51, and the first U-shaped block 52 is located on the side of the top of the driven plate 51 away from the grinding mechanism, and the mounting shaft 32 is located inside the first U-shaped block 52.

[0085] The driven plate 51 has evenly arranged ball bearings rotating at its bottom; the first U-shaped block 52 also has ball bearings rotating at its top.

[0086] In this embodiment, the driven plate 51 has an air groove 53 inside, and the air groove 53 is connected to an external vacuum cleaner through an air pipe;

[0087] The driven plate 51 has a vertical groove 54 at its bottom, and the vertical groove 54 is located below the first U-shaped block 52; the vertical groove 54 has an inclined plate 55 on its side, and the inclined plate 55 slides inside the driven plate 51.

[0088] The inclined plate 55 has a rounded corner design on the side facing the stabilizing mechanism;

[0089] In this embodiment, a second U-shaped block 56 is evenly arranged on the left side of the first U-shaped block 52;

[0090] The second U-shaped block 56 also has rotating balls on its top; the grinding wheel 33 is located between the first U-shaped block 52 and the second U-shaped block 56; the rotating shaft 31 passes through the inside of the second U-shaped block 56.

[0091] During implementation, as the grinding wheel 33 gradually extends into the pipe to grind it, the mounting shaft 32, located inside the first U-shaped block 52, pushes the first U-shaped block 52 to gradually extend into the pipe. Simultaneously, the first U-shaped block 52 drives the driven plate 51 to gradually extend into the pipe. Since the top of the first U-shaped block 52 is equipped with ball bearings, these ball bearings contact the top of the inner ring of the pipe, thus supporting the pipe. Simultaneously, the arc-shaped block 17 supports the bottom of the inner ring of the pipe, improving the support effect and preventing damage from excessive rotation of the drive wheel 35. During the process, the pipe fitting may be pushed downwards. The first U-shaped block 52 supports the pipe fitting and prevents it from shifting downwards. At the same time, since the mounting shaft 32 of the grinding wheel 33 is located inside the first U-shaped block 52, the first U-shaped block 52 can support the mounting shaft 32. This prevents the shaft 31 from jumping when it rotates, as the shaft 31 has a certain length. This would cause the grinding wheel 33 to jump, resulting in misalignment between the grinding wheel 33 and the pipe fitting, causing alternating over-grinding and under-grinding in some areas of the inner ring of the pipe fitting.

[0092] Specifically, since the driven plate 51 has ball bearings at its bottom, when the driven plate 51 enters the pipe, the ball bearings at the bottom of the driven plate 51 will also contact the inner ring surface of the pipe and move along the pipe. Thus, the pipe can be supported by the ball bearings at the bottom of the driven plate 51 and the ball bearings at the top of the first U-shaped block 52. At the same time, as the driven plate 51 gradually extends into the pipe, it will drive the second U-shaped block 56 to extend into the pipe. Since the rotating shaft 31 passes through the second U-shaped block 56, it can limit the second U-shaped block 56 and prevent the rotating shaft 31 from jumping. At the same time, since the second U-shaped block 56 also has ball bearings at its top, when the second U-shaped block 56 moves into the pipe, the ball bearings on the second U-shaped block 56 will also contact the top of the inner ring of the pipe. Thus, the pipe can be supported and the pipe can be prevented from moving downwards during the rotation of the drive wheel 35.

[0093] More specifically, since the driven plate 51 has a sloping plate 55 at the bottom, when the driven plate 51 enters the tube, the sloping plate 55 also enters. Due to the rounded corner design on the sloping plate 55, if the sloping plate 55 contacts the side of the tube, the sloping surface on the sloping plate 55 will first contact the tube and then be pushed into the driven plate 51. Subsequently, the sloping plate 55 will contact the inside of the tube. During the grinding process of the tube, the sloping plate 55 will block the grinding debris. The air groove 53 is connected to the external vacuum cleaner, so the debris can be drawn into the air groove 53 through the vertical groove 54 and then pushed out from the air groove 53, thereby preventing some dust from adhering to the outer surface of the workpiece.

[0094] Furthermore, the multi-segment limiting structure, through which the mounting shaft 32 passes through the first U-shaped block 52 and the rotating shaft 31 passes through the second U-shaped block 56, combined with the ball bearing rolling support at the top of the first U-shaped block 52 and the second U-shaped block 56, can support the pipe fitting, offset the downward pressure generated when the drive wheel 35 is pressed, and solve the problems of downward displacement and skew caused by the downward pressure of the drive wheel 35; at the same time, it can support the rotating shaft 31 and the mounting shaft 32 to prevent jumping; at the same time, the air groove 53 forms a negative pressure through the air pipe connected to the vacuum cleaner, which can quickly extract and discharge the debris in the vertical groove 54, which can avoid secondary cutting and scratch defects caused by the accumulation of debris between the grinding wheel 33 and the inner ring, and improve the surface smoothness of the inner ring; at the same time, it can prevent dust from adhering to the surface of the outer ring of the workpiece, reduce subsequent cleaning processes, and avoid dust wear on the transmission parts of the equipment, thus reducing maintenance costs.

[0095] As an embodiment of the present invention; the base plate 1 includes a left plate and a right plate; the left plate and the right plate are internally threaded with a bidirectional lead screw 37, and the bidirectional lead screw 37 is driven by a fourth motor;

[0096] Both the connecting rod 191 and the straight rod 42 include a left rod and a right rod; both the left rod and the right rod have rectangular grooves; and rectangular rods 38 slide in the rectangular grooves of the left rod and the right rod respectively.

[0097] During implementation, since the base plate 1 is composed of a left plate and a right plate, and since the connecting rod 191 and the straight rod 42 are both composed of a left rod and a right rod, when placing the pipe fitting, the fourth motor drives the bidirectional lead screw 37 to rotate. The bidirectional lead screw 37 will cause the left plate and the right plate to move away from each other. At the same time, the U-shaped seat 11 will cause the left rod and the right rod on the connecting rod 191 and the straight rod 42 to move away from each other, and the rectangular rod 38 will slide in the rectangular groove. Then, the pipe fitting is placed on the support assembly, and then the bidirectional lead screw 37 is controlled to reverse, thereby causing the left plate and the right plate to move closer to each other. At the same time, it will cause the left rod and the right rod to move closer to each other, thereby gradually causing the arc block 17 to extend into the pipe fitting, so that the pipe fitting can be clamped. At the same time, pipe fittings of different lengths of the same pipe fitting can be ground.

[0098] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the convenience of describing the present invention and simplifying the description only, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be construed as indicating or implying relative importance.

[0099] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An internal grinding device for pipe fittings used in engineering machinery, comprising a grinding machine, wherein the grinding machine is equipped with a grinding mechanism and a drive mechanism; characterized in that, The grinding machine includes a worktable; A stabilizing mechanism is installed on the workbench; the stabilizing mechanism includes a base plate (1); two U-shaped seats (11) are provided above the base plate (1); The two U-shaped seats (11) are provided with threaded grooves (12); each of the threaded grooves (12) is threaded with a screw (13), and a limit ring (14) is fixed on the screw (13); The top of the screw (13) is fixed with a gear shaft (15); a U-shaped plate (16) is provided above the gear shaft (15), and the gear shaft (15) rotates on the U-shaped plate (16); two arc-shaped blocks (17) are fixed at the top of the U-shaped plate (16), and rollers (18) rotate at the bottom of each arc-shaped block (17). A worm gear (19) rotates inside the U-shaped seat (11), and the worm gear (19) meshes with the gear shaft (15); the two worm gears (19) are connected by a connecting rod (191); one of the worm gears (19) is driven by a first motor; Multiple support components are provided between the two U-shaped seats (11), and the number of support components is four or more; the support components include two upright plates (2); the upright plates (2) are provided with n-shaped grooves; An arc-shaped plate (21) is provided between the two upright plates (2); two rotating balls (22) are located on the top of the arc-shaped plate (21); sliders (23) are fixed on both sides of the arc-shaped plate (21); Both of the upright plates (2) have grooves on the side facing the slider (23), and the slider (23) slides in the grooves; the bottom of the slider (23) is connected to a spring, and the other side of the spring is fixed in the groove.

2. The internal grinding equipment for pipe fittings in engineering machinery according to claim 1, characterized in that: The stabilizing mechanism is provided with a grinding mechanism on the left side; the grinding mechanism includes a slide (3), and the slide (3) is driven by a lead screw; a second motor is installed on the slide (3), and a rotating shaft (31) is installed on the second motor; a mounting shaft (32) is fixed at the end of the rotating shaft (31), and a grinding wheel (33) is installed on the mounting shaft (32) by a locking nut; The stabilizing mechanism is provided with a driving mechanism at the top; the driving mechanism includes an n-shaped frame (34); there are two driving wheels (35) inside the n-shaped frame (34) that rotate through a driving rod, and the driving wheels (35) are made of elastic rubber material and are driven by a third motor; hydraulic cylinders (36) are installed on both sides of the n-shaped frame (34).

3. The internal grinding equipment for pipe fittings in engineering machinery according to claim 1, characterized in that: Each of the arc-shaped plates (21) has a fixing compartment (24) at its bottom, and the opening of the fixing compartment (24) faces downward; A top block (25) slides inside the fixed chamber (24), and the top block (25) slides inside the fixed chamber (24) by means of a spring; a semi-circular groove is provided at the bottom of the top block (25), and a connecting rod (191) passes through the semi-circular groove.

4. The internal grinding equipment for pipe fittings in engineering machinery according to claim 3, characterized in that: The connecting rod (191) has toothed grooves on its surface; The top block (25) has a limiting wheel (26) rotating in the semi-circular groove, and the limiting wheel (26) meshes with the tooth groove.

5. The internal grinding equipment for pipe fittings in engineering machinery according to claim 4, characterized in that: Two rotating cylinders (4) are provided between the two upright plates (2) of each of the support components, and the rotating cylinders (4) rotate on one of the upright plates (2); Two straight rods (42) are fixed between the two U-shaped seats (11), and the straight rods (42) pass through the vertical plate (2) where the rotating cylinder (4) is not installed, and pass through the rotating cylinder (4); The inner ring of the rotating drum (4) is threaded, and the straight rod (42) located inside the rotating drum (4) is also threaded to mesh with the inner ring of the rotating drum (4); The outer ring surface of the rotating drum (4) is fixed with ratchet teeth (41); the bottom of the fixed chamber (24) is fixed with a U-shaped frame (43), and the connecting rod (191) passes through the U-shaped frame (43); The bottom of the U-shaped frame (43) is fixed with two fixing plates (44), and the fixing plates (44) are located on the left side of the two rotating cylinders (4); the two fixing plates (44) are hinged with pawls (45) on the side facing the ratchet (41), and the pawls (45) engage with the ratchet (41) when they move down, and rotate themselves when they move up.

6. The internal grinding equipment for pipe fittings in engineering machinery according to claim 2, characterized in that: An auxiliary mechanism is installed on the U-shaped plate (16) near the grinding mechanism; The auxiliary mechanism includes two side plates (5); a slide rail is provided on one side of the two side plates (5); a driven plate (51) slides between the two side plates (5); The driven plate (51) has protrusions on both sides, and the protrusions slide in the slide rail; the driven plate (51) has a first U-shaped block (52) fixed on the top, and the first U-shaped block (52) is located on the side of the top of the driven plate (51) away from the grinding mechanism, and the mounting shaft (32) is located inside the first U-shaped block (52); The driven plate (51) has evenly arranged balls rotating at its bottom; the first U-shaped block (52) also has balls rotating at its top.

7. The internal grinding equipment for pipe fittings in engineering machinery according to claim 6, characterized in that: The driven plate (51) has an air groove (53) inside, and the air groove (53) is connected to an external vacuum cleaner through an air pipe; The driven plate (51) has a vertical groove (54) at its bottom, and the vertical groove (54) is located below the first U-shaped block (52); the vertical groove (54) has an inclined plate (55) on its side, and the inclined plate (55) slides inside the driven plate (51); The inclined plate (55) has a rounded corner design on the side facing the stabilizing mechanism.

8. The internal grinding equipment for pipe fittings in engineering machinery according to claim 7, characterized in that: The first U-shaped block (52) has a second U-shaped block (56) evenly arranged on its left side; The second U-shaped block (56) also has a ball bearing rotating on its top; the grinding wheel (33) is located between the first U-shaped block (52) and the second U-shaped block (56); the rotating shaft (31) passes through the inside of the second U-shaped block (56).

9. The internal grinding equipment for pipe fittings in engineering machinery according to claim 2, characterized in that: The base plate (1) includes a left plate and a right plate; the left plate and the right plate are threaded together with a bidirectional lead screw (37), and the bidirectional lead screw (37) is driven by a fourth motor; Both the connecting rod (191) and the straight rod (42) include a left rod and a right rod; both the left rod and the right rod have rectangular grooves; and rectangular rods (38) slide in the rectangular grooves of the left rod and the right rod respectively.

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