Preparation method of wire harness for machine tool spindle monitoring system

Abstract

The present invention discloses a method for preparing a wiring harness for a machine tool spindle monitoring system, and the specific steps are as follows: S1, produce a combined cable for monitoring; S2, cut the combined cable for monitoring into a number of cable segments of equal length, and put a stainless steel corrugated tube on the cable segment; S3, peel the left end of the cable segment, install the sensor core and the sensor cap, peel and tin the left ends of the first signal insulating core wire and the second signal insulating core wire, and seal the sensor cap with liquid glue; S4, put the stainless steel corrugated tube on the sensor core; S5, first peel the right end of the cable segment, then half-peel and move it to the right to expose the tinned copper wire shielding tape, peel the right end of the first signal insulating core wire and the second signal insulating core wire, and crimp the pre-insulated terminal. The advantages of the present invention are: one wiring harness contains the required multiple insulating core wires, which is convenient for wiring and plugging with equipment, and can also effectively prevent the corrosion of the machine tool coolant to the wiring harness and the interference of the machine tool electromagnetic signal to the wiring harness.

Description

Technical Field

[0001] The invention relates to the field of cables, and in particular to a method for preparing a wiring harness for a machine tool spindle monitoring system. Background Art

[0002] During the operation of the machine tool, the operation of the spindle is the key, so the PSC system is generally used on the market to monitor the spindle. The PSC system consists of: a laser measurement module, an interface unit and LC-VISION PSC software, which needs to be run on a laptop. The laser measurement module is installed at any position in the machine tool workspace through the magnet base, and the laser measurement module and the laptop are connected with a cable. The laser measurement module starts to collect spindle data according to the step-by-step interactive instructions, so as to transmit accurate information such as spindle runout, vibration, stability, etc. to the software through the cable. The software stores and analyzes the collected data. Since the PSC system needs to collect multiple data information of the spindle, multiple cables are required to transmit them separately. The cables currently used for PSC systems on the market are generally connected by bundling multiple single-core cables. Each single-core cable transmits one data information, which is not only inconvenient to use, but also has poor flexibility and anti-interference performance. Secondly, since the laser measurement module is installed on the machine tool, and the spindle on the machine tool is generally cooled with coolant during operation, the cable end connected to the laser measurement module is easily affected by coolant corrosion. Summary of the invention

[0003] The object of the present invention is to provide a method for preparing a wiring harness for a machine tool spindle monitoring system, which can realize the transmission of multiple data information through one cable and can be quickly connected with the device without processing during use.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is: a method for preparing a wiring harness for a machine tool spindle monitoring system, and the specific steps are as follows:

[0005] S1. A combined cable for production monitoring, the combined cable for monitoring comprising: two first signal insulated core wires, two second signal insulated core wires and a ground wire, the first signal insulated core wires, the second signal insulated core wires and the ground wire are twisted into a cable core with a cotton rope as the center, a PP tape is wrapped around the cable core, a tinned copper wire shielding tape is woven on the PP tape, a non-woven fabric tape is wrapped around the tinned copper wire shielding tape, and a sheath is extruded on the non-woven fabric tape;

[0006] S2. Cut the monitoring combined cable into several cable segments of equal length according to the required length, and flexibly sleeve the stainless steel corrugated tube on the cable segment;

[0007] S3, movably sleeve the sensor core on the sheath of the cable segment, peel the left end of the sheath on the cable segment to form a new left end and expose the tinned copper wire shielding tape, trim the tinned copper wire shielding tape and the PP wrapping tape, and fold them to expose the cable core, the cable core is twisted, and a sensor cap is sleeved on the cable core, the sensor cap is inserted into the new left end of the sheath, and then liquid glue is coated on the outer wall of the new left end of the sheath, the sensor core is moved to a position close to the liquid glue, and then the sensor core and the sensor cap are riveted together with a riveting machine, the ground wire and the cotton rope in the cable core exposed at the left end of the cable segment are cut off, and then the first signal insulating core wire and the second signal insulating core wire in the cable core exposed at the left end of the cable segment are peeled and tinned, and the tinned conductors on the first signal insulating core wire and the second signal insulating core wire are wrapped with a heat shrink tube, and the sensor cap and the sensor core riveted together on the cable segment are fixed on the fixing plate, and liquid glue is coated on the sensor cap, and wait for solidification;

[0008] S4. After the liquid glue coated on the sensor cap is solidified, the stainless steel bellows set is fixed on the sensor core;

[0009] S5. Peel the right end of the sheath on the cable segment to form a new right end, then cut off the non-woven fabric tape, tinned copper wire shielding tape, PP wrapping tape, cotton rope and ground wire exposed on the right end, and then half-peel the right side of the sheath to form a movable sheath segment, move the sheath segment to the right to expose the non-woven fabric tape, and then peel off the non-woven fabric tape exposed between the sliding sleeve and the sheath segment to expose the tinned copper wire shielding tape, peel the first signal insulated core wire and the second signal insulated core wire exposed at the right end of the cable segment to expose the conductor, crimp a pre-insulated terminal on the exposed conductor, and wrap the pre-insulated terminal with a heat shrink tube.

[0010] Furthermore, in the aforementioned method for preparing a wiring harness for a machine tool spindle monitoring system, text content regarding important data such as type, specification, manufacturing information, etc. is marked on the sheath at intervals from left to right. When processing the left and right ends of the cable segment, it is necessary to first determine the left and right ends of the cable segment by the order of the text on the sheath.

[0011] Furthermore, in the aforementioned method for preparing a wiring harness for a machine tool spindle monitoring system, the stripping length of the left end of the sheath is 75 mm ± 3 mm, the first signal insulating core wire and the second signal insulating core wire in the cable core exposed at the left end of the cable segment are trimmed by 2 mm, then stripped by 2 mm and tinned.

[0012] Furthermore, in the preparation method of the wiring harness for the aforementioned machine tool spindle monitoring system, the stripping length of the right end of the sheath is 210mm±5mm, and then half-stripping is performed at 50mm±3mm away from the new right end of the sheath, and the half-stripped sheath section is moved 10mm±2mm to the right, and the first signal insulating core wire and the second signal insulating core wire in the exposed cable core at the right end of the cable section are stripped 8mm and crimped with pre-insulated terminals.

[0013] Furthermore, in the aforementioned method for preparing the wiring harness for the machine tool spindle monitoring system, in which, in S3, the non-woven fabric tape, tinned copper wire shielding tape and PP wrapping tape need to be trimmed to 15mm~20mm and folded, and then the new left end of the sheath is heated at a temperature of 270℃~280℃ with a drying gun for 2s~3s, so that the sheath is softened by the heat, the non-woven fabric tape and the PP wrapping tape are melted, and the sensor cap is inserted into the tinned copper wire shielding tape at the new left end of the sheath.

[0014] Furthermore, in the aforementioned method for preparing a wiring harness for a machine tool spindle monitoring system, in S3, before riveting, liquid glue is first coated on the outer wall of the new left end of the sheath, and then the sensor core is moved to a position close to the liquid glue, and before the liquid glue solidifies, the sensor cap is riveted with a riveting machine avoiding the cable core, so that the sensor cap and the sensor core are riveted together, and it is observed whether there is liquid glue overflowing from the sensor core. If there is overflow, wipe off the overflowed liquid glue with a lint-free rag, and if there is no overflow, the entire cable segment is scrapped.

[0015] Further, the preparation method of the wiring harness for the aforementioned machine tool spindle monitoring system, wherein the riveting machine includes: a platform plate, a guide rod is vertically arranged on the platform plate, an adjusting seat is slidably arranged on the guide rod, a plurality of first tightening bolts are threadedly arranged on the adjusting seat, the first tightening bolts abut against the guide rod, a pier plate is slidably arranged in the adjusting seat, a hollow rivet is passed through the bottom of the pier plate, an avoidance groove is opened on the side wall of the hollow rivet, a pull rod capable of driving the pier plate to rise and fall is rotatably arranged on the adjusting seat, the pull rod is rotatably connected to the adjusting seat through a gear shaft, a straight tooth is arranged on one side wall of the pier plate close to the gear shaft, the straight tooth is meshed with the curved tooth on the gear shaft, a fixing rod is arranged on the adjusting seat, a tension spring is arranged on the fixing rod, the tension spring is connected to the pier plate, a positioning plate is placed on the platform plate, a plurality of step positioning holes with different apertures are opened on the side wall of the positioning plate, and a plurality of support feet of equal height are arranged on the positioning plate.

[0016] Furthermore, the aforementioned method for preparing a wiring harness for a machine tool spindle monitoring system, wherein a plurality of step fixing holes are evenly distributed on the side wall of a fixing plate, the size of the step fixing holes being adapted to the sensor core, and when the sensor core at the left end of the cable segment is inserted into the step fixing hole, the sensor cap on the cable segment is horizontally facing upward, and liquid glue is coated on the sensor cap to form a glue layer of equal thickness.

[0017] Furthermore, in the aforementioned method for preparing a wiring harness for a machine tool spindle monitoring system, the conductor cross-sectional area of ​​the first signal insulating core wire is 0.25 mm 2 The tensile strength between the conductor in the first signal insulated core wire and the pre-insulated terminal is greater than 32N, and the cross-sectional area of ​​the conductor in the second signal insulated core wire is 0.14mm 2 The tensile strength between the conductor in the second signal insulated core wire and the pre-insulated terminal is greater than 18N.

[0018] Furthermore, in the aforementioned method for preparing a wiring harness for a machine tool spindle monitoring system, the length L of the stainless steel bellows is 波 The length of the cable segment L 段 The ratio between them is 1:3~3.5.

[0019] The advantages of the present invention are as follows: the combined monitoring cable of the present invention contains a plurality of required insulating core wires, and only one cable is needed to complete wiring when in use, which simplifies the wiring process and ensures the flexibility of the entire cable; and after the combined monitoring cable of the present invention is made into a wiring harness, customers can directly use it without subsequent processing after purchasing it, thereby improving work efficiency;

[0020] Before using the PSC system, you only need to insert the tinned first signal insulated core wire and the second signal insulated core wire at the left end of the cable segment into the corresponding laser measurement module for plugging and connection, and then plug the pre-insulated terminals on the first signal insulated core wire and the second signal insulated core wire at the right end of the cable segment into the connection terminals of the laptop computer. Then, connect the grounding protection device to the tinned copper wire shielding tape between the sheath and the sheath segment to protect the entire line in the event of a fault.

[0021] When the machine tool spindle rotates, since the left end of the cable segment is located inside the machine tool, the stainless steel bellows can not only prevent the corrosion of the coolant in the machine tool to the sheath, but also isolate the electromagnetic signals generated by the electronic components in the machine tool. The tinned copper wire shielding tape in the cable segment improves the anti-electromagnetic interference ability of the entire cable segment. The stainless steel bellows has good flexibility and only one end of the stainless steel bellows is fixedly connected to the sensor core, and the other end is in a suspended state. Therefore, the stainless steel bellows will not affect the flexibility of the cable segment when protecting the cable segment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the combined monitoring cable in the method S1 for preparing the wiring harness for the machine tool spindle monitoring system of the present invention.

[0023] Figure 2It is a schematic diagram of the socket connection structure between the cable segment and the stainless steel corrugated tube in the preparation method S2 of the wire harness for the machine tool spindle monitoring system of the present invention.

[0024] Figure 3 It is a schematic diagram of the installation structure between the sensor core and the sensor cap and the sheath after the left end of the cable segment is stripped in the preparation method S3 of the wire harness for the machine tool spindle monitoring system of the present invention.

[0025] Figure 4 It is a schematic structural diagram of the sensor core and the sensor cap after riveting in the method S3 for preparing the wiring harness for the machine tool spindle monitoring system of the present invention.

[0026] Figure 5 It is a schematic structural diagram of the first signal insulating core wire and the second signal insulating core wire after being stripped and tinned in the method S3 for preparing the wiring harness for the machine tool spindle monitoring system of the present invention.

[0027] Figure 6 It is a structural schematic diagram of the fixed connection between the stainless steel bellows and the sensor core in the method S4 for preparing the wiring harness for the machine tool spindle monitoring system of the present invention.

[0028] Figure 7 It is a structural schematic diagram of a complete wiring harness obtained after the right end of the sheath is stripped, half-stripped, and the first signal insulating core wire and the second signal insulating core wire are stripped and crimped with pre-insulated terminals in the preparation method S5 of the wiring harness for the machine tool spindle monitoring system of the present invention.

[0029] Figure 8 It is a structural schematic diagram of the riveting machine involved in the method S3 for preparing the wiring harness for the machine tool spindle monitoring system of the present invention.

[0030] Fig. 9 yes Figure 8 Schematic diagram of the connection structure between the center pier plate and the gear shaft.

[0031] Fig.10 yes Figure 8 Schematic diagram of the cross-sectional structure of a hollow rivet.

[0032] Fig.11 yes Figure 8 Schematic diagram of the structure of the positioning plate.

[0033] Fig.12 It is a structural schematic diagram of the fixing plate involved in the method S3 for preparing the wiring harness for the machine tool spindle monitoring system of the present invention. DETAILED DESCRIPTION

[0034] The technical solution of the present invention is further described below in conjunction with the accompanying drawings and preferred embodiments.

[0035] The method for preparing the wiring harness for the machine tool spindle monitoring system of the present invention comprises the following specific steps:

[0036] S1, production monitoring combination cable 1, such as Figure 1 As shown, the monitoring combined cable 1 includes: two first signal insulating core wires 11, two second signal insulating core wires 12 and a ground wire 13. The conductor cross-sectional area of ​​the first signal insulating core wire 11 is 0.25 mm 2 The conductor cross-sectional area of ​​the second signal insulated core wire 12 is 0.14 mm 2 According to different data signal transmission requirements, the use of two conductors with different cross-sectional areas, the first signal insulating core wire 11 and the second signal insulating core wire 12, can better transmit the corresponding data signal. In order to facilitate wiring, the colors of the two first signal insulating core wires 11, the colors of the two second signal insulating core wires 12, and the color of the ground wire 13 are all different. The first signal insulating core wire 11, the second signal insulating core wire 12, and the ground wire 13 are twisted into a cable core with a cotton rope 14 as the center. A PP tape 15 is wrapped around the cable core. The PP tape 15 has good moisture resistance and chemical corrosion resistance, and can play a good barrier role for the coolant, preventing the first signal insulating core wire 11, the second signal insulating core wire 12, and the ground wire 13 from being affected by the coolant. A tinned copper wire shielding tape 16 is woven on the PP tape 15. The PP tape 15 can play a structural support role to prevent the first signal insulating core wire 11, the second signal insulating core wire 12, and the ground wire 13 from being affected by the coolant when weaving the tinned copper wire shielding tape 16. The insulating core wire 11, the second signal insulating core wire 12 and the ground wire 13 are deformed due to extrusion. The braiding density of the tinned copper wire shielding tape 16 is ≥85%, which can effectively resist external electromagnetic interference and ensure the signal transmission stability of the first signal insulating core wire 11 and the second signal insulating core wire 12. A non-woven tape 17 is wrapped around the tinned copper wire shielding tape 16, and a sheath 18 is squeezed on the non-woven tape 17. The non-woven tape 17 can prevent adhesion between the sheath 18 and the tinned copper wire shielding tape 16, which is convenient for subsequent stripping. The sheath 18 is made of PUR material and has good wear resistance, bending resistance and high flexibility. The text content of important data such as type, specification, manufacturing information, etc. is marked on the sheath 18 from left to right, which is convenient for customers to understand the cable information and for the staff to judge the left and right ends of the cable according to the text order on the sheath 18 during subsequent processing;

[0037] The monitoring combined cable 1 of the present invention contains a plurality of required insulating core wires. When in use, only one cable is needed to complete the wiring, which simplifies the wiring process and ensures the flexibility of the entire cable. However, after the customer purchases it, it is necessary to perform subsequent processing according to the needs before it can be used in the PSC system. Therefore, the monitoring combined cable 1 of the present invention needs to be made into a wiring harness. After the customer purchases it, it can be directly plugged into the PSC system for use without subsequent processing, thereby improving work efficiency.

[0038] S2. Cut the monitoring combined cable 1 into several cable segments 1' of equal length according to the required length, and flexibly sleeve the stainless steel corrugated tube 2 on the cable segment 1'. The length of the stainless steel corrugated tube 2 is L 波 The length L of the cable segment 1' 段 The ratio between them is 1:3~3.5, such as Figure 2 As shown;

[0039] S3. The staff determines the left and right ends of the cable segment 1' through the text content on the cable segment 1', and flexibly sleeves the sensor core 3 on the sheath 18 of the cable segment 1'. The left end of the sheath 18 on the cable segment 1' is peeled off (the non-woven fabric tape 17 adhered to the sheath 18 is peeled off together) to form a new left end and expose the tinned copper wire shielding tape 16. The peeling length of the left end of the sheath 18 is 75mm±3mm. The exposed tinned copper wire shielding tape 16 and PP wrapping tape 15 on the left end are trimmed to 15mm~20mm and then folded to expose the cable core. At this time, the cable core is not loose but twisted. A sensor cap 31 is mounted on the cable core, and the new left end of the sheath 18 is heated at a temperature of 270°C to 280°C by a drying gun, so that the new left end of the sheath 18 is heated and softened, and the non-woven fabric tape 17 and the PP wrapping tape 15 are melted after being heated, and the non-woven fabric tape 17 and the PP wrapping tape 15 exposed to the outside with a length of 15mm to 20mm after trimming are separated from the non-woven fabric tape 17 and the PP wrapping tape 15 in the sheath 18, and then the sensor cap 31 is inserted into the tinned copper wire shielding tape 16, and then the outer side wall of the new left end of the sheath 18 is coated with liquid glue 19, and the liquid glue 19 is a prior art, such as Figure 3 As shown;

[0040] Move the sensor core 3 to a position close to the liquid glue 19, and then use a riveting machine 4 to rivet the sensor cap 31 to the sensor core 3 before the liquid glue solidifies. During the riveting, a shear force is formed between the sensor cap 31 and the sensor core 3 to shear off the exposed tinned copper wire shielding tape 16. Figure 4 As shown;

[0041] Observe whether there is liquid glue 19 overflowing from the sensor core 3. If there is overflow, it means that the sheath 18 and the sensor core 3 are completely adhered. Use a lint-free cloth to wipe off the overflowed liquid glue 19. If there is no overflow, it means that there is a gap between the sheath 18 and the sensor core 3, and the adhesion is incomplete. The entire cable segment 1' needs to be scrapped;

[0042] After tearing apart the exposed cable core at the left end of the cable segment 1', cut the ground wire 13 and the cotton rope 14 to be flush with the sensor cap 31, trim the exposed first signal insulating core wire 11 and the second signal insulating core wire 12 at the left end of the cable segment 1' by 2mm, peel them by 2mm, and then tin them. Trimming off the exposed ends that are easily oxidized can improve the soldering quality, and then use a heat shrink tube to wrap the tinned conductors on the first signal insulating core wire 11 and the second signal insulating core wire 12 to prevent the tin on the conductor from rubbing against foreign objects and being damaged, fix the sensor cap 31 and the sensor core 3 riveted together on the cable segment 1' on the fixing plate 5, and then apply liquid glue 19 on the sensor cap 31, and the liquid glue 19 penetrates into the gap between the sensor cap 31 and the first signal insulating core wire 11, the second signal insulating core wire 12 and the ground wire 13 in the cable core, as shown in FIG. Figure 5 As shown, curing is carried out, and the curing time is not less than 12h;

[0043] S4, after the liquid glue 19 coated between the sensor cap 31 and the cable core is cured, the liquid glue 19 plays a waterproof role to prevent external water vapor from penetrating into the cable segment 1', and the stainless steel corrugated tube 2 is fixed on the sensor core 3. Figure 6 As shown;

[0044] S5. Peel the right end of the sheath 18 on the cable segment 1' (peel off the non-woven fabric tape 17 adhered to the sheath 18 together) to form a new right end. The peeling length of the right end of the sheath 18 is 210mm±5mm. Then cut off the non-woven fabric tape 17, tinned copper wire shielding tape 16, PP wrapping tape 15, cotton rope 14 and ground wire 13 exposed at the right end. Then half-peel the sheath 18 at a distance of 50mm±3mm from the new right end. Do not damage the non-woven fabric tape 17 during half-peeling. Move the half-peeled sheath segment 181 to the right by 10mm±2mm. Then peel off the non-woven fabric tape 17 exposed between the sheath 18 and the sheath segment 181 to expose the tinned copper wire shielding tape 16. At this time, the right end of the ground wire 13 left after being cut is located in the sheath segment 181. The sheath segment 181 serves to isolate and protect the ground wire 13. The first signal insulating core wire 11 and the second signal insulating core wire 12 exposed at the right end of the cable segment 1' are peeled to expose the conductors, and the pre-insulating terminal 6 is crimped on the exposed conductors. The tensile strength between the conductor in the first signal insulating core wire 11 and the pre-insulating terminal 6 is greater than 32N, and the tensile strength between the conductor in the second signal insulating core wire 12 and the pre-insulating terminal 6 is greater than 18N. The pre-insulating terminal 6 and the conductors of different wire diameters have sufficient mechanical strength to withstand the mechanical stress in normal use and avoid electrical failures caused by loosening or falling off. Then, the pre-insulating terminal 6 is wrapped with a heat shrink tube to protect the pre-insulating terminal 6. The first signal insulating core wire 11 and the second signal insulating core wire 12 exposed at the right end of the cable segment 1' are also tied and fixed with a heat shrink tube to prevent tangled wires. Figure 7 shown.

[0045] Before using the PSC system, it is only necessary to insert the tinned first signal insulating core wire 11 and the second signal insulating core wire 12 at the left end of the cable segment 1' into the corresponding laser measurement module for plugging and connection. Since the first signal insulating core wire 11 and the second signal insulating core wire 12 are tinned in advance, the signal transmission capability of the first signal insulating core wire 11 and the second signal insulating core wire 12 can be guaranteed during plugging and connection. Then, the pre-insulated terminals 6 on the first signal insulating core wire 11 and the second signal insulating core wire 12 at the right end of the cable segment 1' can be inserted into the wiring terminals of the laptop computer. Then, a grounding protection device (belonging to the prior art) is connected to the tinned copper wire shielding tape 16 between the sheath 18 and the sheath segment 181 to protect the entire line in the event of a fault.

[0046] When the machine tool spindle rotates, since the left end of the cable segment 1' is located inside the machine tool, the stainless steel bellows 2 can not only prevent the coolant in the machine tool from corroding the sheath 18, but also isolate the electromagnetic signals generated by the electronic components in the machine tool. The tinned copper wire shielding tape 16 in the cable segment 1' improves the anti-electromagnetic interference capability of the entire cable segment 1'. The stainless steel bellows 2 has good flexibility, and only one end of the stainless steel bellows 2 is fixedly connected to the sensor core 3, and the other end is in a suspended state. Therefore, the stainless steel bellows 2 will not affect the flexibility of the cable segment 1' when protecting the cable segment 1'.

[0047] In this embodiment, during the riveting in S3, since the sensor cap 31 is inserted into the cable segment 1' to lift up the new left end of the sheath 18 of the cable segment 1', the sensor core 3 cannot be riveted with the sensor cap 31 by manual operation. In the riveting process, it is also necessary to ensure that the cable core is not damaged, so a special riveting machine 4 is required for riveting, such as Figure 8 to Figure 11 As shown, the riveting machine 4 includes: a platform plate 41, a guide rod 42 is vertically arranged on the platform plate 41, an adjustment seat 43 is slidably arranged on the guide rod 42, a plurality of first tightening bolts 431 are threadedly arranged on the adjustment seat 43, the first tightening bolts 431 abut against the guide rod 42, a pier plate 432 is slidably arranged in the adjustment seat 43, a hollow rivet 44 is penetrated at the bottom of the pier plate 432, an avoidance groove 441 is opened on the side wall of the hollow rivet 44, a pull rod 433 capable of driving the pier plate 432 to rise and fall is rotatably arranged on the adjustment seat 43, the pull rod 433 is rotatably connected to the adjustment seat 43 through a gear shaft 4331, and the pier plate 432 abuts against the guide rod 42. A straight tooth is provided on one side wall of the proximal gear shaft 4331, and the straight tooth meshes with the curved tooth on the gear shaft 4331. The pull rod 433 is rotated to drive the gear shaft 4331 to rotate, and the curved tooth on the gear shaft 4331 can cooperate with the straight teeth on the pier plate 432, thereby driving the pier plate 432 to rise and fall. A fixing rod 434 is provided on the adjustment seat 43, and a tension spring 45 is provided on the fixing rod 434. The tension spring 45 is connected to the pier plate 432. A positioning plate 46 is placed on the platform plate 41, and a plurality of step positioning holes 461 with different apertures are opened on the side wall of the positioning plate 46, and a plurality of supporting feet 462 of equal height are provided on the positioning plate 46.

[0048] Before riveting, liquid glue 19 needs to be applied around the outer wall of the new left end of the sheath 18, and then the sensor core 3 is inserted into the corresponding step positioning hole 461 to fix it. At this time, the new left end of the sheath 18 is in a vertical state, and the liquid glue 19 will flow downward under the action of gravity. Then the twisted cable core is passed through the avoidance groove 441 of the hollow rivet 44 and placed in the cavity of the hollow rivet 44. The staff rotates the pull rod 433 to drive the pier plate 432 and the hollow rivet 44 to press down. The hollow rivet 44 acts on the sensor cap 31 to drive the sensor cap 31 and the cable segment 1' to move downward together, and the sensor core 3 is limited by the step positioning hole 461, so the sensor cap 31 can be riveted with the sensor core 3 after moving downward with the cable segment 1'. Since the cable core is located in the hollow rivet 44, the cable core will not be damaged when the sensor core 3 and the sensor cap 31 are riveted. After the device cap 31 is riveted, under the action of extrusion, the liquid glue 19 coated on the new left end of the sheath 18 will fill the gap between the sensor core 3 and the sheath 18. Therefore, only when the gap between the sensor core 3 and the sheath 18 is filled with liquid glue 19 and can no longer be filled with excess liquid glue 19, will the excess liquid glue 19 overflow from the sensor core 3. This means that the gap between the sensor core 3 and the sheath 18 has been completely filled with liquid glue 19, indicating that the adhesion strength between the sensor core 3 and the sheath 18 is high. When there is no excess liquid glue 19 overflowing from the sensor core 3, it means that the amount of liquid glue 19 applied is insufficient to completely fill the gap between the sheath 18 and the sensor core 3. There is still a gap without adhesion between the sheath 18 and the sensor core 3, so the adhesion strength between the sensor core 3 and the sheath 18 is insufficient, which is prone to electrical failure due to loosening or falling off during subsequent use.

[0049] In this embodiment, during curing in S3, it is necessary to prevent the tinned conductors on the first signal insulating core wire 11 and the second signal insulating core wire 12 exposed at the left end of the cable segment 1' from being damaged. In this case, a customized fixing plate 5 is required. Fig.12As shown, the fixing plate 5 is made of stainless steel, and a plurality of step fixing holes 51 are evenly distributed on the side wall of the fixing plate 5. The size of the step fixing hole 51 is adapted to the sensor core 3. The sensor core 3 at the left end of the cable segment 1' is inserted into the step fixing hole 51. At this time, the sensor cap 31 on the cable segment 1' is horizontally facing upward. When the liquid glue 19 is applied to the sensor cap 31, it can be ensured that the liquid level line of the liquid glue 19 in the sensor cap 31 is horizontal and will not drip out. The first signal insulating core wire 11 and the second signal insulating core wire 12 at the left end of the cable segment 1' are spread in different directions to expand the gap between the first signal insulating core wire 11, the second signal insulating core wire 12 and the sensor cap 31. Then, the liquid glue 19 at the end of the sensor cap 31 is dried and blown with a drying gun for 2s to 3s to reduce and increase the fluidity of the liquid glue 19. The liquid glue 19 can be better filled into each gap. When the liquid glue 19 is cured, the glue layer in the sensor cap 31 is of equal thickness, and the waterproof effect is better.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for preparing a wiring harness for a machine tool spindle monitoring system, characterized in that: The specific steps are as follows: S1. A combined cable for production monitoring, the combined cable for monitoring comprising: two first signal insulated core wires, two second signal insulated core wires and a ground wire, the first signal insulated core wires, the second signal insulated core wires and the ground wire are twisted into a cable core with a cotton rope as the center, a PP tape is wrapped around the cable core, a tinned copper wire shielding tape is woven on the PP tape, a non-woven fabric tape is wrapped around the tinned copper wire shielding tape, and a sheath is extruded on the non-woven fabric tape; S2. Cut the monitoring combined cable into several cable segments of equal length according to the required length, and flexibly sleeve the stainless steel corrugated tube on the cable segment; S3, movably sleeve the sensor core on the sheath of the cable segment, peel the left end of the sheath on the cable segment to form a new left end and expose the tinned copper wire shielding tape, trim the tinned copper wire shielding tape and the PP wrapping tape, and fold them to expose the cable core, the cable core is twisted, and a sensor cap is sleeved on the cable core, the sensor cap is inserted into the new left end of the sheath, and then liquid glue is coated on the outer wall of the new left end of the sheath, the sensor core is moved to a position close to the liquid glue, and then the sensor core and the sensor cap are riveted together with a riveting machine, the ground wire and the cotton rope in the cable core exposed at the left end of the cable segment are cut off, and then the first signal insulating core wire and the second signal insulating core wire in the cable core exposed at the left end of the cable segment are peeled and tinned, and the tinned conductors on the first signal insulating core wire and the second signal insulating core wire are wrapped with a heat shrink tube, and the sensor cap and the sensor core riveted together on the cable segment are fixed on the fixing plate, and liquid glue is coated on the sensor cap, and wait for solidification; S4. After the liquid glue coated on the sensor cap is solidified, the stainless steel bellows set is fixed on the sensor core; S5. Peel the right end of the sheath on the cable segment to form a new right end, then cut off the non-woven fabric tape, tinned copper wire shielding tape, PP wrapping tape, cotton rope and ground wire exposed on the right end, and then half-peel the right side of the sheath to form a movable sheath segment, move the sheath segment to the right to expose the non-woven fabric tape, and then peel off the non-woven fabric tape exposed between the sliding sleeve and the sheath segment to expose the tinned copper wire shielding tape, peel the first signal insulated core wire and the second signal insulated core wire exposed at the right end of the cable segment to expose the conductor, crimp a pre-insulated terminal on the exposed conductor, and wrap the pre-insulated terminal with a heat shrink tube.

2. The method for preparing a wire harness for a machine tool spindle monitoring system according to claim 1, characterized in that: Text content is marked on the sheath from left to right at intervals, and the text content is type, specification, and manufacturing information. When processing the left and right ends of the cable segment, it is necessary to first determine the left and right ends of the cable segment by the order of the text on the sheath.

3. The method for preparing a wire harness for a machine tool spindle monitoring system according to claim 1, characterized in that: The stripping length of the left end of the sheath is 75mm±3mm. The first signal insulated core wire and the second signal insulated core wire in the exposed cable core at the left end of the cable segment are trimmed by 2mm, then stripped by 2mm and tinned.

4. The method for preparing a wire harness for a machine tool spindle monitoring system according to claim 1, characterized in that: The stripping length of the right end of the sheath is 210mm±5mm, and then half-stripping is performed at 50mm±3mm away from the new right end of the sheath. The half-stripped sheath section moves 10mm±2mm to the right. The first signal insulating core wire and the second signal insulating core wire in the exposed cable core at the right end of the cable section are stripped 8mm and crimped with the pre-insulated terminal.

5. The method for preparing a wire harness for a machine tool spindle monitoring system according to claim 1, characterized in that: In S3, the non-woven fabric tape, tinned copper wire shielding tape and PP wrapping tape need to be trimmed to 15mm~20mm and folded, and then the new left end of the sheath is heated at 270℃~280℃ with a drying gun for 2s~3s to soften the sheath, melt the non-woven fabric tape and PP wrapping tape, and insert the sensor cap into the tinned copper wire shielding tape at the new left end of the sheath.

6. The method for preparing a wire harness for a machine tool spindle monitoring system according to claim 1, characterized in that: In S3, before riveting, liquid glue is first applied to the outer wall of the new left end of the sheath, and then the sensor core is moved to a position close to the liquid glue. Before the liquid glue solidifies, the sensor cap is riveted with a riveting machine avoiding the cable core to rivet the sensor cap and the sensor core together. Observe whether liquid glue overflows from the sensor core. If so, wipe off the overflowed liquid glue with a lint-free rag. If not, the entire cable segment is scrapped.

7. The method for preparing a wire harness for a machine tool spindle monitoring system according to claim 1 or 6, characterized in that: The riveting machine includes: a platform plate, a guide rod is vertically arranged on the platform plate, an adjustment seat is slidably arranged on the guide rod, a plurality of first tightening bolts are threadedly arranged on the adjusting seat, the first tightening bolts abut against the guide rod, a pier plate is slidably arranged in the adjusting seat, a hollow rivet is passed through the bottom of the pier plate, an avoidance groove is provided on the side wall of the hollow rivet, a pull rod capable of driving the pier plate to rise and fall is rotatably arranged on the adjusting seat, the pull rod is rotatably connected to the adjusting seat through a gear shaft, a straight tooth is arranged on one side wall of the pier plate close to the gear shaft, the straight tooth is meshed with the curved tooth on the gear shaft, a fixing rod is arranged on the adjusting seat, a tension spring is arranged on the fixing rod, the tension spring is connected to the pier plate, a positioning plate is placed on the platform plate, a plurality of step positioning holes with different apertures are provided on the side wall of the positioning plate, and a plurality of supporting feet of equal height are provided on the positioning plate.

8. The method for preparing a wire harness for a machine tool spindle monitoring system according to claim 1, characterized in that: There are several step fixing holes evenly distributed on the side wall of the fixing plate. The size of the step fixing holes is adapted to the sensor core. When the sensor core at the left end of the cable segment is inserted into the step fixing hole, the sensor cap on the cable segment is horizontally facing upward, and the liquid glue is coated on the sensor cap to form a glue layer of equal thickness.

9. The method for preparing a wire harness for a machine tool spindle monitoring system according to claim 1, characterized in that: The conductor cross-sectional area of ​​the first signal insulated core wire is 0.25mm 2 The tensile strength between the conductor in the first signal insulated core wire and the pre-insulated terminal is greater than 32N, and the cross-sectional area of ​​the conductor in the second signal insulated core wire is 0.14mm 2 The tensile strength between the conductor in the second signal insulated core wire and the pre-insulated terminal is greater than 18N.

10. The method for preparing a wire harness for a machine tool spindle monitoring system according to claim 1, characterized in that: Length L of stainless steel bellows 波 The length of the cable segment L 段 The ratio between them is 1:3~3.5.

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