Glue injection pressing device self-adaptive to depth of wood tenon hole

Abstract

The invention relates to the technical field of glue injection and tenon planting, in particular to a glue injection pressing device self-adaptive to the depth of a wood tenon hole, the glue injection pressing device comprises a three-axis platform, a glue injection unit and a detection unit, the glue injection unit comprises a lifting seat, a glue storage box, a glue extraction barrel, a piston and a first linear driver, and a glue injection pipe is arranged at the bottom of the glue extraction barrel; the detection unit comprises a positioning box slidably mounted below the glue pumping barrel, a supporting rod and a conical block are arranged at the bottom of the positioning box, first guide rods arranged on the peripheral side of the positioning box are inserted into guide sleeves arranged on the peripheral side of the outer wall of the glue pumping barrel, and the tops of the first guide rods are fixedly connected through a horizontal connecting block; the detection unit further comprises a first distance measuring sensor and a second distance measuring sensor; according to the technical scheme, the first distance measuring sensor is matched with the glue injection pipe, the second distance measuring sensor is matched with the conical block to collect mortise depth and diameter data in real time, the volume is automatically calculated and matched with the glue injection amount, the glue injection amount is accurately controlled according to the volume, and glue is prevented from overflowing.

Description

Technical Field

[0001] The present invention relates to the technical field of glue-inlaid tenon technology, and specifically relates to a glue injection and pressing device for adapting to the depth of wood tenon holes. Background Art

[0002] Injecting glue into wood tenon holes and pressing is a key process in wood processing to improve the tenon joint performance. The core purpose of injecting glue into wood tenon holes and pressing is to make up for the defects of single tenon joints and improve the comprehensive performance of connections through the synergistic effect of adhesive bonding and mechanical tenon joints. In wood processing, in order to prevent glue from overflowing when the tenon is inserted into the tenon hole, usually workers need to accurately inject glue according to the volume of the tenon hole. Generally, the glue injection amount is 60%-80% of the volume of the tenon hole, so as to reserve the extrusion space when the tenon is inserted. However, when there are multiple circular tenon holes with different depths and diameters on each workpiece, workers need to confirm the volume of each circular tenon hole, so as to extrude an appropriate amount of glue. The operation is rather cumbersome and requires a lot of data, which greatly reduces the efficiency of dispensing glue. Summary of the Invention

[0003] In view of the above problems, it is necessary to provide a glue injection and pressing device for adapting to the depth of wood tenon holes in view of the problems of the prior art.

[0004] In order to solve the problems of the prior art, the technical solution adopted by the present invention is as follows:

[0005] A glue injection and pressing device for adapting to the depth of wood tenon holes includes a three-axis platform, a glue injection unit and a detection unit. The glue injection unit includes a lifting seat installed on the working end of the three-axis platform. A glue storage box is installed on the lifting seat. A glue extraction cylinder with a vertically arranged axis is installed outside the glue storage box. A piston is coaxially installed in the glue extraction cylinder. The piston is connected to the working end of a first linear driver installed outside the glue extraction cylinder. The bottom of the glue extraction cylinder is provided with a vertically extending glue inlet channel and a glue outlet channel. The glue inlet channel is connected to the inside of the glue storage box through a pipeline. The glue outlet channel is connected to the top end of a glue injection pipe extending vertically downward from the glue extraction cylinder. The bottom end of the glue injection pipe is provided with a glue outlet hole; the detection unit includes a positioning box slidably installed below the glue extraction cylinder. The bottom of the positioning box is provided with several vertical support rods. Several vertically upward extending first guide rods are arranged on the periphery of the positioning box. The first guide rods are inserted into guide sleeves arranged on the outer periphery of the glue extraction cylinder. The top of the first guide rods is fixedly connected through a horizontal connecting block. The detection unit further includes a first distance measuring sensor fixedly installed outside and with its working end located below the connecting block; a conical block that slides along the axis of the glue injection pipe is arranged at the bottom of the positioning box. The conical block has a taper that narrows downward. The glue injection pipe is inserted into a guide hole arranged at the axis of the conical block. The positioning box is provided with a second distance measuring sensor for detecting the displacement distance of the conical block. The first distance measuring sensor and the second distance measuring sensor are signal-connected to a data processing module. The data processing module is signal-connected to the first linear driver through a controller.

[0006] Preferably, a limiting sleeve is coaxially arranged at the top end of the first guide rod. When the positioning box makes the limiting sleeve fit against the top of the guide sleeve under the action of gravity, the bottom end of the glue injection pipe is flush with the bottom end of the support rod.

[0007] Preferably, several second guide rods extending vertically upward are arranged at the upper end of the conical block. The second guide rods are inserted into the positioning box and extend into the positioning box. One end of the second guide rod located inside the positioning box is fixedly connected through a horizontal limiting plate. When the limiting plate fits against the bottom of the positioning box, the position of the maximum diameter of the conical block is on the same horizontal line as the bottom end of the support rod.

[0008] Preferably, the second distance measuring sensor is fixedly installed inside the positioning box and its working end is arranged vertically downward. An observation hole is arranged at the bottom of the positioning box and is located below the working end of the second distance measuring sensor. A detection block extending radially along the conical block to below the observation hole is arranged on the circumferential side of the conical block.

[0009] Preferably, the bottom of the glue extraction cylinder is provided with a downward-reducing taper, and the bottom of the piston is provided with the same taper as the bottom of the glue extraction cylinder; the axis of the glue outlet channel is on the same straight line as the axis of the glue extraction cylinder, and the glue inlet channel is arranged in parallel on one side of the glue outlet channel.

[0010] Preferably, the inner diameters of the glue inlet channel and the glue outlet channel are the same. The bottom of the glue extraction cylinder is provided with an insertion slot extending radially along the glue inlet channel and the glue outlet channel and truncating the glue inlet channel and the glue outlet channel. An adjusting plate with the same width and thickness as the insertion slot is slidably installed in the insertion slot. A communication hole with the same diameter as the glue inlet channel is arranged on the adjusting plate, and the axis of the communication hole is arranged vertically. One end of the adjusting plate located outside the glue extraction cylinder is fixedly connected to the working end of a second linear driver fixedly installed outside the glue extraction cylinder, and the second linear driver drives the communication hole to reciprocate between the glue inlet channel and the glue outlet channel.

[0011] Preferably, the linear distance between one end of the adjusting plate located inside the insertion slot and the communication hole is greater than the linear distance between the axes of the glue inlet channel and the glue outlet channel.

[0012] Preferably, the axis of the glue injection pipe is on the same straight line as the axis of the glue outlet channel. A limiting rotating ring is coaxially arranged at the top end of the glue injection pipe. The glue injection pipe is rotationally installed in a sealing sleeve arranged at the bottom of the glue extraction cylinder through the limiting rotating ring; the glue outlet hole is located at the bottom end of the glue injection pipe and extends radially through the side wall of the glue injection pipe. A rotation driving unit is arranged at the bottom of the glue extraction cylinder, and the rotation driving unit drives the glue injection pipe to rotate around its own axis when the three-axis platform drives the glue injection pipe to lift and lower.

[0013] Preferably, the rotation driving unit includes a first gear coaxially installed at the top end of the glue injection tube, and a second gear rotatably installed on the outer wall of the glue extraction cylinder. The first gear is meshed with the second gear. The rotation driving unit further includes a first bevel gear coaxially arranged on the second gear, and a second bevel gear rotatably installed on the outer wall of the glue extraction cylinder. The first bevel gear is meshed with the second bevel gear and the axis of the second bevel gear is horizontally arranged along the radial direction of the glue extraction cylinder. The rotation driving unit further includes a third gear coaxially arranged with the second bevel gear. The third gear is meshed with a rack fixedly installed on the working end of the three-axis platform. The rack is arranged on one side of the lifting seat and extends in the vertical direction.

[0014] The beneficial effects of the present invention compared with the prior art are as follows:

[0015] First, through the cooperation of the first distance measuring sensor and the glue injection tube, and the second distance measuring sensor and the conical block, the present invention can collect the data of the tenon hole depth and diameter in real time. The data processing module automatically calculates the volume and matches the glue injection amount, solving the problem of cumbersome manual calculation for multi-specification tenon holes, greatly improving the efficiency of glue injection, and accurately controlling the glue injection amount according to the volume, reserving the extrusion space for the tenon head to insert, which can prevent the glue from overflowing and keep the surface of the workpiece clean.

[0016] Second, the present invention drives the adjustment plate to move through the second linear driver to realize the switching of the glue flow path. The adjustment plate is used for physical blockage instead of relying on a one-way valve, avoiding the failure problem of the traditional one-way valve caused by glue residue jamming, especially suitable for high-viscosity glue.

[0017] Third, during the glue injection process, the rotation driving unit rotates and moves the glue injection tube upward, forming a spiral motion trajectory. The glue enters the glue injection tube from the glue outlet channel and is sprayed onto the inner wall of the tenon hole through the radial glue outlet holes. The glue is evenly coated on the inner wall of the tenon hole in the form of a spiral, forming a continuous and uniform-thickness glue layer, improving the bonding strength after the subsequent pressing of the tenon head and the tenon hole. Description of the Drawings

[0018] Figure 1 is the front view of an injection and pressing device for adapting to the depth of a wooden tenon hole in a non-working state;

[0019] Figure 2 is Figure 1 the sectional view taken along the line A-A of

[0020] Figure 3 is Figure 2 the partial enlarged view at B of

[0021] Figure 4 is the side view of an injection and pressing device for adapting to the depth of a wooden tenon hole in a non-working state;

[0022] Figure 5 isFigure 4 Cross-sectional view of the C-C section;

[0023] Figure 6 is Figure 5 Enlarged partial view of the D position;

[0024] Figure 7 is a three-dimensional view of an injection glue pressing device with an adaptive tenon hole depth in a non-working state;

[0025] Figure 8 is Figure 7 Enlarged partial view of the E position;

[0026] Figure 9 is Figure 7 Enlarged partial view of the F position;

[0027] Figure 10 is a three-dimensional view of an injection glue pressing device with an adaptive tenon hole depth in a working state;

[0028] Figure 11 is Figure 10 Three-dimensional cross-sectional view;

[0029] Figure 12 is Figure 11 Enlarged partial view of the G position in;

[0030] Figure 13 is Figure 11 Enlarged partial view of the H position in.

[0031] The reference numerals in the figure are: 1 - three-axis platform; 11 - rack; 2 - injection glue unit; 21 - lifting seat; 22 - glue storage box; 23 - glue extraction cylinder; 231 - piston; 232 - glue inlet channel; 233 - glue outlet channel; 234 - guide sleeve; 235 - insertion slot; 236 - adjusting plate; 237 - communication hole; 238 - second linear driver; 239 - sealing sleeve; 24 - first linear driver; 25 - injection glue pipe; 251 - glue outlet hole; 252 - limit rotating ring; 26 - rotation drive unit; 261 - first gear; 262 - second gear; 263 - first bevel gear; 264 - second bevel gear; 265 - third gear; 3 - detection unit; 31 - positioning box; 311 - support rod; 312 - first guide rod; 313 - connecting block; 314 - first distance measuring sensor; 315 - second distance measuring sensor; 316 - limit sleeve; 317 - observation hole; 32 - tapered block; 321 - guide hole; 322 - second guide rod; 323 - limit plate; 324 - detection block. Detailed implementation manners

[0032] To further understand the features, technical means, specific purposes and functions achieved by the present invention, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0033] Refer to Figures 1 to 13 as shown

[0034] An injection molding and pressing device with an adaptive tenon hole depth, comprising a three-axis platform 1, an injection unit 2 and a detection unit 3. The injection unit 2 includes a lifting seat 21 installed on the working end of the three-axis platform 1. A glue storage box 22 is installed on the lifting seat 21. An axisymmetrically arranged glue extraction cylinder 23 is installed outside the glue storage box 22. A piston 231 is coaxially installed in the glue extraction cylinder 23. The piston 231 is connected to the working end of a first linear driver 24 installed outside the glue extraction cylinder 23. A vertically extending glue inlet channel 232 and a glue outlet channel 233 are provided at the bottom of the glue extraction cylinder 23. The glue inlet channel 232 is connected to the inside of the glue storage box 22 through a pipeline. The glue outlet channel 233 is connected to the top of a glue injection pipe 25 that extends vertically downward from the glue extraction cylinder 23. A glue outlet hole 251 is provided at the bottom end of the glue injection pipe 25. The detection unit 3 includes a positioning box 31 slidably installed below the glue extraction cylinder 23. A plurality of vertical support rods 311 are provided at the bottom of the positioning box 31. A plurality of vertically upward extending first guide rods 312 are provided on the periphery of the positioning box 31. The first guide rods 312 are inserted into guide sleeves 234 provided on the outer periphery of the glue extraction cylinder 23. The top of the first guide rods 312 is fixedly connected through a horizontal connecting block 313. The detection unit 3 further includes a first distance measuring sensor 314 fixedly installed outside 330 and with its working end located below the connecting block 313. A tapered block 32 that slides along the axis of the glue injection pipe 25 is provided at the bottom of the positioning box 31. The tapered block 32 has a taper that narrows downward. The glue injection pipe 25 is inserted into a guide hole 321 provided on the axis of the tapered block 32. A second distance measuring sensor 315 for detecting the displacement distance of the tapered block 32 is provided on the positioning box 31. The first distance measuring sensor 314 and the second distance measuring sensor 315 are signal-connected to a data processing module. The data processing module is signal-connected to the first linear driver 24 through a controller.

[0035] When this application is in use, the glue injection unit 2 and the detection unit 3 are moved to directly above the wooden tenon hole to be processed through the three-axis platform 1, so that the axis of the glue injection tube 25 is aligned with the axis of the tenon hole. Subsequently, the working end of the three-axis platform 1 drives the lifting seat 21 to move downward, so that the support rod 311 at the bottom of the positioning box 31 first contacts the surface of the workpiece, and the tapered block 32 is inserted into the circular tenon hole. Since the diameters of the tenon holes are different, the insertion depth of the tapered block 32 will change accordingly, that is, the linear distance between the outer wall of the tapered block 32 and the working end of the second ranging sensor 315 will change after the tapered block 32 fits the opening of the tenon hole. The second ranging sensor 315 at the bottom of the positioning box 31 real-time monitors the displacement distance of the tapered block 32 relative to the positioning box 31. Since the diameter of the tapered block 32 changes linearly along the height direction, and the diameter at any position is proportional to the height, the data processing module can calculate the diameter D of the circular tenon hole through the geometric relationship derivation of the taper of the tapered block 32 and the insertion depth of the tapered block 32. As the working end of the three-axis platform 1 continues to descend, after the support rod 311 at the bottom of the positioning box 31 first contacts the surface of the workpiece, the glue injection tube 25 at the bottom of the glue extraction cylinder 23 moves downward relative to the positioning box 31 until the bottom end of the glue injection tube 25 contacts the bottom end of the circular tenon hole. The first ranging sensor 314 detects the increase in the distance between the connecting block 313 and the working end of the first ranging sensor 314, calculates the moving distance of the glue injection tube 25, and then the actual depth H of the circular tenon hole can be obtained. The data processing module combines the two sets of ranging data to obtain the actual volume V = D * H of the circular tenon hole. Further, according to the preset glue injection ratio K, the actual glue injection volume V1 = V * K is obtained. The controller sends an instruction to the first linear driver 24 according to V1. The first linear driver 24 can be a cylinder or an electric push rod, etc. The first linear driver 24 drives the piston 231 to move a corresponding stroke in the glue extraction cylinder 23. For example, if the cross-sectional area of the glue extraction cylinder 23 is S, then the stroke L of the piston 231 is L = V1 / S. When the piston 231 moves upward by L, glue is sucked from the glue storage box 22 through the glue inlet channel 232, and then moves downward by L, and is injected into the tenon hole through the glue outlet channel 233 and the glue outlet hole 251 of the glue injection tube 25. Subsequently, the three-axis platform 1 drives the glue injection tube 25 to withdraw from the tenon hole, and the glue injection unit 2 and the detection unit 3 are reset with the equipment and moved to the next circular tenon hole for glue injection. In this embodiment, the first ranging sensor 314 cooperates with the glue injection tube 25, and the second ranging sensor 315 cooperates with the tapered block 32 to collect the depth and diameter data of the tenon hole in real time. The data processing module automatically calculates the volume and matches the glue injection amount, which solves the problem of cumbersome manual calculation for multi-specification tenon holes, greatly improves the efficiency of glue injection, and the glue injection amount is accurately controlled according to the volume, reserving the extrusion space for the tenon head insertion, which can prevent the glue from overflowing and keep the surface of the workpiece clean.

[0036] In order to ensure that the increase in the distance between the connecting block 313 detected by the first ranging unit 314 and the working end of the first ranging sensor 314 is the depth of the tenon hole, the following features are specifically set:

[0037] A limit sleeve 316 is coaxially arranged at the top end of the first guide rod 312. When the positioning box 31 makes the limit sleeve 316 fit against the top of the guide sleeve 234 under the action of gravity, the bottom end of the glue injection tube 25 is flush with the bottom end of the support rod 311.

[0038] In this embodiment, when the positioning box 31 makes the limit sleeve 316 fit against the top of the guide sleeve 234 under the action of gravity, at this time, the distance between the connecting block 313 and the working end of the first distance measuring sensor 314 detected by the first distance measuring sensor 314 is the initial distance L0. When the support rod 311 fits against the surface of the workpiece, the bottom end of the glue injection tube 25 is flush with the opening of the mortise hole. As the glue injection tube 25 moves downward, the connecting block 313 moves upward relative to the first distance measuring sensor 314, and the distance detected by the first distance measuring sensor 314 increases from L0 to L1. The increase in distance is L = L1 - L0, and this value is equal to the depth H of the mortise hole. The limit sleeve 316 in this embodiment forcibly ensures that the bottom ends of the glue injection tube 25 and the support rod 311 are flush in the initial state, forming a fixed mechanical zero point, avoiding detection deviation caused by height error during equipment installation, and ensuring that the increase in the amount detected by the first distance measuring sensor 314 directly corresponds to the depth of the mortise hole without manual calibration.

[0039] In order to ensure that the movement change of the tapered block 32 detected by the second distance measuring unit 315 can obtain the diameter of the mortise hole, the following features are specifically set:

[0040] Several second guide rods 322 extending vertically upward are arranged at the upper end of the tapered block 32. The second guide rods 322 are inserted into the positioning box 31 and extend into the interior of the positioning box 31. One end of the second guide rods 322 located inside the positioning box 31 is fixedly connected through a horizontal limiting plate 323. When the limiting plate 323 fits against the bottom of the positioning box 31, the position of the maximum diameter of the tapered block 32 is on the same horizontal line as the bottom end of the support rod 311.

[0041] The second distance measuring sensor 315 is fixedly installed in the positioning box 31 and its working end is arranged vertically downward. An observation hole 317 is arranged at the bottom of the positioning box 31 below the working end of the second distance measuring sensor 315. A detection block 324 extending radially along the tapered block 32 to below the observation hole 317 is arranged on the circumferential side of the tapered block 32.

[0042] In this embodiment, when the limiting plate 323 fits against the bottom of the positioning box 31, the conical block 32 is in its initial position. At this time, the position of the maximum diameter of the conical block 32 is on the same horizontal line as the bottom end of the support rod 311. Before the positioning box 31 moves down until the support rod 311 touches the surface of the workpiece, the conical block 32 first inserts into the mortise hole until the outer wall of the conical block 32 fits against the opening of the mortise hole. Subsequently, the conical block 32 stops moving and moves vertically relative to the positioning box 31. The second distance measuring sensor 315 can then detect the change in the distance between the detection block 324 on the conical block 32 and its working end through the observation hole 317. The data processing module can calculate the diameter of the mortise hole based on the known taper of the conical block 32 and the maximum diameter of the conical block 32. In this embodiment, the cooperation between the second guide rod 322 and the positioning box 31 forms a vertical guide to ensure that the conical block 32 is inserted perpendicularly along the axis of the mortise hole, avoiding diameter detection deviation caused by inclination. When the limiting plate 323 fits against the bottom of the positioning box 31, it forcibly limits the alignment of the position of the maximum diameter of the conical block 32 with the bottom end of the support rod 311, forming a unified diameter detection reference to ensure the accuracy of the calculation result.

[0043] In order to ensure that the piston 231 can inject all the glue in the glue extraction cylinder 23 into the mortise hole, the following features are specifically set:

[0044] The bottom of the glue extraction cylinder 23 is provided with a downward-tapering shape, and the bottom of the piston 231 is provided with the same downward-tapering shape as the bottom of the glue extraction cylinder 23; the axis of the glue outlet channel 233 is on the same straight line as the axis of the glue extraction cylinder 23, and the glue inlet channel 232 is arranged in parallel on one side of the glue outlet channel 233.

[0045] Before starting this embodiment, the first linear actuator 24 can be started in advance to drive the piston 231 to reciprocate and extract the glue in the glue storage box 22, so that the glue fills the glue inlet channel 232, the glue outlet channel 233, and the injection tube 25. When a subsequent fixed amount of glue is sucked from the glue storage box 22 through the glue inlet channel 232 into the glue extraction cylinder 23. When the piston 231 moves downward, the glue can be squeezed toward the glue outlet channel 233. Since both the bottom of the glue extraction cylinder 23 and the bottom of the piston 231 have the same downward-tapering shape, when the piston moves down to the lowest point, its conical bottom surface completely fits against the conical bottom of the glue extraction cylinder 23, and the glue outlet channel 233 is coaxial with the glue extraction cylinder 23, ensuring that the glue flows smoothly into the injection tube 25 along the axis direction and avoiding dead-end residues.

[0046] In order to ensure the directional movement of the glue, it is necessary to keep the glue inlet channel 232 unblocked and the glue outlet channel 233 blocked when the piston 231 moves upward, and keep the glue inlet channel 232 blocked and the glue outlet channel 233 unblocked when the piston 231 moves downward. The following features are specifically set:

[0047] The inner diameters of the glue inlet channel 232 and the glue outlet channel 233 are the same. At the bottom of the glue extraction cylinder 23, there is an insertion slot 235 that extends radially along the glue inlet channel 232 and the glue outlet channel 233 and truncates the glue inlet channel 232 and the glue outlet channel 233. A regulating plate 236 with the same width and thickness as the insertion slot 235 is slidably installed in the insertion slot 235. A communication hole 237 with the same diameter as the glue inlet channel 232 is provided on the regulating plate 236. The axis of the communication hole 237 is vertically arranged. One end of the regulating plate 236 located outside the glue extraction cylinder 23 is fixedly connected to the working end of a second linear actuator 238 fixedly installed outside the glue extraction cylinder 23. The second linear actuator 238 drives the communication hole 237 to reciprocate between the glue inlet channel 232 and the glue outlet channel 233.

[0048] The linear distance between one end of the regulating plate 236 located inside the insertion slot 235 and the communication hole 237 is greater than the linear distance between the axes of the glue inlet channel 232 and the glue outlet channel 233.

[0049] In this embodiment, when the piston moves upward to suck glue, the second linear actuator 238 drives the regulating plate 236 to move, aligning the communication hole 237 coaxially with the glue inlet channel 232. Since the linear distance between one end of the regulating plate 236 located inside the insertion slot 235 and the communication hole 237 is greater than the linear distance between the axes of the glue inlet channel 232 and the glue outlet channel 233, at this time, the glue outlet channel 233 is completely blocked by the solid part of the regulating plate 236. Subsequently, the piston 231 moves upward, creating a negative pressure inside the glue extraction cylinder 23 to cause the glue to enter the inside of the glue extraction cylinder 23 from the glue storage box 22. When the piston moves downward to inject glue, the second linear actuator 238 drives the regulating plate 236 to move in the reverse direction, aligning the communication hole 237 coaxially with the glue outlet channel 233. At this time, the glue inlet channel 232 is completely blocked by the solid part of the regulating plate 236. The piston 231 moves downward, squeezing the glue to enter the injection tube 25 through the glue outlet channel 233 and be discharged. In this embodiment, the second linear actuator 238 drives the regulating plate 236 to move to achieve the switching of the glue flow path. The regulating plate 236 is used for physical blocking rather than relying on a one-way valve, avoiding the failure problem caused by glue residue jamming in the traditional one-way valve, and is particularly suitable for high-viscosity glue.

[0050] In order to achieve the purpose of extruding the glue spirally on the inner wall of the mortise hole, the following features are specifically set:

[0051] The axis of the injection tube 25 is on the same straight line as the axis of the glue outlet channel 233. A limiting rotating ring 252 is coaxially arranged at the top of the injection tube 25. The injection tube 25 is rotatably installed in a sealing sleeve 239 provided at the bottom of the glue extraction cylinder 23 through the limiting rotating ring 252; the glue outlet hole 251 is located at the bottom end of the injection tube 25 and extends radially through the side wall of the injection tube 25. A rotation driving unit 26 is provided at the bottom of the glue extraction cylinder 23. When the three-axis platform 1 drives the injection tube 25 to move up and down, the rotation driving unit 26 drives the injection tube 25 to rotate around its own axis.

[0052] In this embodiment, the glue injection tube 25 is connected to the sealing sleeve 239 at the bottom of the glue extraction cylinder 23 through the limit rotating ring 252, ensuring that the glue injection tube 25 can freely rotate around its own axis while preventing glue leakage. After the detection unit 3 detects the depth of the mortise hole, the first linear driver 24 drives the piston 231 to move upward to extract an appropriate amount of glue. Subsequently, when the first linear driver 24 drives the piston 231 to move downward, the three-axis platform 1 drives the glue injection tube 25 to move upward uniformly in the mortise hole, and at the same time, the rotation drive unit 26 drives the glue injection tube 25 to rotate synchronously. During the glue injection process, the glue injection tube 25 rotates and moves upward, forming a spiral motion trajectory. The glue enters the glue injection tube 25 from the glue outlet channel 233 and is sprayed onto the inner wall of the mortise hole through the radial glue outlet holes 251. The glue is evenly coated on the inner wall of the mortise hole in the form of a spiral, forming a continuous and uniform-thickness glue layer. This improves the bonding strength after the subsequent pressing of the tenon and the mortise hole.

[0053] To solve the problem of how the rotation drive unit 26 drives the glue injection tube 25 to automatically rotate around the axis, the following features are specifically set:

[0054] The rotation drive unit 26 includes a first gear 261 coaxially installed at the top end of the glue injection tube 25, and a second gear 262 rotatably installed on the outer wall of the glue extraction cylinder 23. The first gear 261 is meshed and connected to the second gear 262. The rotation drive unit 26 further includes a first bevel gear 263 coaxially arranged on the second gear 262, and a second bevel gear 264 rotatably installed on the outer wall of the glue extraction cylinder 23. The first bevel gear 263 is meshed and connected to the second bevel gear 264, and the axis of the second bevel gear 264 is horizontally arranged along the radial direction of the glue extraction cylinder 23. The rotation drive unit 26 further includes a third gear 265 coaxially arranged with the second bevel gear 264, and the third gear 265 is meshed with a rack 11 fixedly installed on the working end of the three-axis platform 1. The rack 11 is arranged on one side of the lifting seat 21 and extends in the vertical direction.

[0055] In this embodiment, the three-axis platform 1 drives the lifting seat 21 to move, driving the entire glue injection unit 2 to move. The vertical rack 11 fixed on the three-axis platform 1 moves with the lifting seat 21 while maintaining its height position unchanged. When the lifting seat 21 drives the glue extraction cylinder 23 and the glue injection tube 25 to move up and down, the rack 11 meshes with the third gear 265, driving the third gear 265 to rotate around the horizontal axis. The third gear 265 is coaxial with the second bevel gear 264, driving the second bevel gear 264 to rotate synchronously. The second bevel gear 264 meshes with the first bevel gear 263, converting the horizontal rotation into a vertical rotation, driving the first bevel gear 263 and the second gear 262 to rotate coaxially. The second gear 262 meshes with the first gear 261, finally driving the glue injection tube 25 to rotate around its own axis, realizing spiral glue injection. In this embodiment, the lifting power of the three-axis platform 1 is used to drive the rotation of the glue injection tube, without an additional motor, reducing the volume and energy consumption of the equipment.

[0056] Working principle: When in use, the glue injection unit 2 and the detection unit 3 are moved to directly above the wooden tenon hole to be processed through the three-axis platform 1, so that the axis of the glue injection tube 25 is aligned with the axis of the tenon hole. Subsequently, the working end of the three-axis platform 1 drives the lifting seat 21 to move downward, so that the support rod 311 at the bottom of the positioning box 31 first contacts the surface of the workpiece, the tapered block 32 is inserted into the circular tenon hole, and the second distance measuring sensor 315 at the bottom of the positioning box 31 real-time monitors the displacement distance of the tapered block 32 relative to the positioning box 31. The data processing module can calculate the diameter D of the circular tenon hole through the geometric relationship derivation of the taper of the tapered block 32 and the insertion depth of the tapered block 32. As the working end of the three-axis platform 1 continues to descend, after the support rod 311 at the bottom of the positioning box 31 first contacts the surface of the workpiece, the glue injection tube 25 at the bottom of the glue extraction cylinder 23 moves downward relative to the positioning box 31 until the bottom end of the glue injection tube 25 contacts the bottom end of the circular tenon hole. The first distance measuring sensor 314 detects the increase in the distance between the connecting block 313 and the working end of the first distance measuring sensor 314, calculates the moving distance of the glue injection tube 25, and thus obtains the actual depth H of the circular tenon hole. The data processing module combines the two sets of distance measuring data to obtain the actual volume V = D * H of the circular tenon hole, and further obtains the actual glue injection volume V1 = V * K according to the preset glue injection ratio K. The controller sends an instruction to the first linear driver 24 according to V1 to drive the piston 231 to move a corresponding stroke in the glue extraction cylinder 23. For example, if the cross-sectional area of the glue extraction cylinder 23 is S, the stroke L of the piston 231 is L = V1 / S. When the piston 231 moves up by L, it sucks glue from the glue storage box 22 through the glue inlet channel 232, and then moves down by L, and injects the glue into the tenon hole through the glue outlet channel 233 and the glue outlet hole 251 of the glue injection tube 25. Subsequently, the three-axis platform 1 drives the glue injection tube 25 to withdraw from the tenon hole, and the glue injection unit 2 and the detection unit 3 are reset with the equipment and moved to the next circular tenon hole for glue injection.

[0057] The above embodiments only represent one or several implementation manners of the present invention, and the description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A glue injection and pressing device with adaptive depth of wooden tenon holes, comprising a three-axis platform, a glue injection unit and a detection unit, characterized in that: The glue injection unit comprises a lifting seat installed on the working end of the three-axis platform, a glue storage box is installed on the lifting seat, a glue extraction cylinder with a vertical axis is installed outside the glue storage box, a piston is coaxially installed in the glue extraction cylinder, the piston is connected to the working end of a first linear driver installed outside the glue extraction cylinder, a vertically extending glue inlet channel and a glue outlet channel are arranged at the bottom of the glue extraction cylinder, the glue inlet channel is connected to the glue storage box through a pipeline, the glue outlet channel is connected to the top of a glue injection tube extending vertically downward from the glue extraction cylinder, and a glue outlet hole is arranged at the bottom of the glue injection tube; The detection unit includes a positioning box slidably mounted below the glue extraction cylinder, a plurality of vertical support rods are arranged at the bottom of the positioning box, a plurality of first guide rods extending vertically upward are arranged around the positioning box, the first guide rods are inserted into guide sleeves arranged around the outer wall of the glue extraction cylinder, and the top of the first guide rods is fixedly connected through a horizontal connecting block, and the detection unit also includes a first distance measuring sensor fixedly mounted on the outside and with a working end located below the connecting block; A conical block sliding along the axis of the glue injection tube is arranged at the bottom of the positioning box. The conical block has a downwardly narrowing taper. The glue injection tube is inserted into a guide hole arranged at the axis of the conical block. A second distance measuring sensor for detecting the displacement distance of the conical block is arranged on the positioning box. The signals of the first distance measuring sensor and the second distance measuring sensor are connected to a data processing module, and the data processing module is connected to the first linear drive through a controller signal.

2. The self-adaptive glue injection and pressing device for wooden tenon hole depth according to claim 1, characterized in that: A limiting sleeve is coaxially arranged at the top end of the first guide rod. When the positioning box makes the limiting sleeve fit the top of the guide sleeve under the action of gravity, the bottom end of the glue injection tube is flush with the bottom end of the support rod.

3. The self-adaptive glue injection and pressing device for wooden tenon hole depth according to claim 1, characterized in that: A plurality of second guide rods extending vertically upward are arranged at the upper end of the conical block, the second guide rods are inserted into the positioning box and extend into the interior of the positioning box, one end of the second guide rod located in the positioning box is fixedly connected by a horizontal limiting plate, and when the limiting plate is attached to the bottom of the positioning box, the maximum diameter position of the conical block is on the same horizontal line as the bottom end of the support rod.

4. The glue injection and pressing device with adaptive depth of wooden tenon holes according to claim 1, characterized in that: The second distance measuring sensor is fixedly installed in the positioning box with the working end arranged vertically downward. The bottom of the positioning box is provided with an observation hole located below the working end of the second distance measuring sensor, and a detection block is arranged on the circumference of the conical block and extends radially along the conical block to below the observation hole.

5. The glue injection and pressing device with adaptive depth of wooden tenon hole according to claim 1, characterized in that: The bottom of the glue pumping cylinder is provided with a tapered downwardly contracting taper, and the bottom of the piston is provided with the same taper as the bottom of the glue pumping cylinder; The axis of the glue outlet channel is on the same straight line as the axis of the glue extraction cylinder, and the glue inlet channel is arranged parallel to one side of the glue outlet channel.

6. The glue injection and pressing device with adaptive depth of wooden tenon holes according to claim 5, characterized in that: The inner diameters of the glue inlet channel and the glue outlet channel are the same, and an insertion groove extending radially along the glue inlet channel and the glue outlet channel and cutting off the glue inlet channel and the glue outlet channel is provided at the bottom of the glue extraction cylinder, and an adjustment plate with the same width and thickness as the insertion groove is slidably installed in the insertion groove, and a connecting hole with the same diameter as the glue inlet channel is provided on the adjustment plate, and the axis of the connecting hole is vertically arranged, and one end of the adjustment plate located outside the glue extraction cylinder is fixedly connected to the working end of a second linear drive fixedly installed outside the glue extraction cylinder, and the second linear drive drives the connecting hole to reciprocate between the glue inlet channel and the glue outlet channel.

7. The glue injection and pressing device with adaptive depth of wooden tenon holes according to claim 6, characterized in that: The straight-line distance between one end of the adjustment plate located inside the insertion slot and the communicating hole is greater than the straight-line distance between the axes of the glue inlet channel and the glue outlet channel.

8. The glue injection and pressing device with adaptive depth of wooden tenon holes according to claim 1, characterized in that: The axis of the glue injection tube is in the same straight line as the axis of the glue outlet channel, a limit swivel is coaxially arranged at the top of the glue injection tube, and the glue injection tube is rotatably installed in a sealing sleeve arranged at the bottom of the glue extraction cylinder through the limit swivel; The glue outlet hole is located at the bottom end of the glue injection tube and extends radially through the side wall of the glue injection tube. A rotating drive unit is arranged at the bottom of the glue extraction cylinder. When the three-axis platform drives the glue injection tube to rise and fall, the rotating drive unit drives the glue injection tube to rotate around its own axis.

9. The glue injection and pressing device with adaptive depth of wooden tenon holes according to claim 8, characterized in that: The rotary drive unit includes a first gear coaxially mounted on the top of the glue injection tube, and a second gear rotatably mounted on the outer wall of the glue extraction cylinder, the first gear is meshed with the second gear, the rotary drive unit also includes a first bevel gear coaxially arranged on the second gear, and a second bevel gear rotatably mounted on the outer wall of the glue extraction cylinder, the first bevel gear is meshed with the second bevel gear, and the axis of the second bevel gear is horizontally arranged along the radial direction of the glue extraction cylinder; The rotary drive unit also includes a third gear coaxially arranged with the second bevel gear, the third gear is meshed with a rack fixedly installed on the working end of the three-axis platform, and the rack is arranged on one side of the lifting seat and extends in the vertical direction.

Images