Linear transmission device with real-time monitoring of lubricating oil

Abstract

The application discloses a linear transmission device capable of monitoring the amount of lubricating oil in real time, comprising a long shaft, a moving part, a lubricating device and a detection module. The moving part is arranged on the long shaft in a manner capable of moving along the axial direction of the long shaft. The lubricating device comprises a shell and an oil-containing unit. The shell is fixed to one end of the moving part and forms a first accommodating space. The oil-containing unit is arranged in the first accommodating space. The detection module comprises a temperature sensing unit and a control unit. The temperature sensing unit is arranged on the shell and adjacent to the oil-containing unit. The temperature sensing unit is used for detecting the current temperature of the oil-containing unit. The control unit is connected with the temperature sensing unit. The control unit is configured to perform the following steps: receiving the current temperature; calculating the remaining amount of lubricating oil in the oil-containing unit according to the current temperature and a lubricating oil releasing model; and outputting the remaining amount.

Description

TECHNICAL FIELD

[0001] The present application relates to a linear transmission device, and more particularly to a linear transmission device capable of monitoring the amount of lubricating oil in real time. BACKGROUND

[0002] Linear transmission devices, such as ball screws or linear slides, are widely used in various machines requiring precise movement due to their excellent mechanical transmission efficiency. However, the components of linear transmission devices need to be sufficiently lubricated, otherwise they are prone to wear due to friction between each other, thereby shortening their service life.

[0003] Taiwanese Patent No. I359237 discloses a ball screw lubrication sensing device, which is provided with two wires connected to the nut. The two wires form a conductive loop, and a contact resistance is generated by the nut, rolling elements and screw. When the oil film attached to the surface of the rolling elements disappears, the conductive loop forms a path to activate a warning device to remind the operator to supplement or replace the lubricating oil. However, the peripheral equipment of the aforementioned patent is relatively complex, and its detection mechanism is easily affected by the working environment, such as cutting fluid and chips, and thus is not accurate.

[0004] US Patent No. US 6216821 B1 discloses a ball screw lubrication device, which uses a polymer component containing lubricating oil to be in slidable contact with the outer diameter of the screw, so as to prevent the lubricating oil attached to the thread groove of the screw from being scraped off, thereby allowing the lubricating oil to be maintained in the thread groove of the screw. However, the aforementioned patent lacks a mechanism for detecting and feeding back the remaining amount of lubricating oil, and the user cannot know in real time when the remaining amount of lubricating oil is insufficient or depleted, which is not conducive to maintenance and repair.

[0005] As the industries applying linear transmission devices, such as the semiconductor or automation industries, have entered or are moving towards the scale of unmanned factories, how to effectively monitor the amount of lubricating oil of linear transmission devices in an unmanned environment to schedule maintenance in a timely manner and avoid shortening the service life of linear transmission devices due to insufficient lubrication has become the goal of related industries. SUMMARY

[0006] The present application aims to provide a linear transmission device to solve the above problems.

[0007] According to an embodiment of the present application, a linear transmission device capable of monitoring the amount of lubricating oil in real time is provided. The linear transmission device includes a long shaft, a moving member, a lubricating device, and a detection module. The moving member is arranged on the long shaft in a manner capable of moving along the axial direction of the long shaft. The lubricating device includes a housing and an oil-containing unit. The housing is fixed to one end of the moving member and forms a first accommodating space. The oil-containing unit is arranged in the first accommodating space and is used to provide lubricating oil to the outer surface of the long shaft. The detection module includes a temperature sensing unit and a control unit. The temperature sensing unit is arranged on the housing and is adjacent to the oil-containing unit. The temperature sensing unit is used to detect the current temperature of the oil-containing unit. The control unit is connected to the temperature sensing unit. The control unit is configured to perform the following operations: receiving the current temperature; calculating the remaining amount of lubricating oil in the oil-containing unit according to the current temperature and an oil release model; and outputting the remaining amount.

[0008] Compared with the prior art, the linear transmission device of the present application estimates the remaining amount of lubricating oil by temperature, can know in real time that the lubricating oil is insufficient or will soon be exhausted, can arrange maintenance and maintenance in a timely manner, is beneficial to prolong the service life, and is beneficial to the application of unmanned factories. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 is a perspective view of a linear transmission device according to an embodiment of the present application.

[0010] Figure 2 is Figure 1 is an exploded view of a linear transmission device.

[0011] Figure 3 is Figure 1 is a partial cross-sectional view of a linear transmission device.

[0012] Figure 4 is Figure 1 is an exploded view of a lubricating device.

[0013] Figure 5 is a function block diagram of a detection module and a signal receiving unit according to an embodiment of the present application.

[0014] Figure 6 is a step flowchart of the control unit monitoring the amount of lubricating oil.

[0015] Figure 7 is a step flowchart of establishing an oil release model according to an embodiment of the present application.

[0016] Figure 8 is a step flowchart of calculating the oil release rate of the oil-containing unit corresponding to each reference temperature per unit time according to an embodiment of the present application.

[0017] Figure 9is a reference temperature versus oil release rate graph according to an embodiment of the present application.

[0018] Figure 10 is an exploded view of a lubricating device according to another embodiment of the present application.

[0019] Figure 11 is a perspective view of a linear motion device according to another embodiment of the present application.

[0020] Figure 12 is Figure 11 an exploded view of a lubricating device.

[0021] BRIEF DESCRIPTION OF DRAWINGS 10, 40 - linear motion device; 110, 410 - long shaft; 111, 411 - outer surface; 112 - outer thread groove; 120, 420 - moving member; 121 - inner surface; 122 - inner thread groove; 130, 130', 430 - lubricating device; 140, 440 - housing; 141, 141', 441 - first housing; 142, 442 - second housing; 143, 143', 443 - first accommodating space; 144' - second accommodating space; 145, 145' - first through hole; 146, 146' - annular groove; 146a - groove bottom; 147 - second through hole; 148' - inner annular wall; 150, 450 - oil containing unit; 151, 451 - solid lubricating material; 152, 452 - guide portion; 160 - ball; 170 - return flow element; 200 - detection module; 210, 510 - temperature sensing unit; 220 - control unit; 230, 530 - signal receiving unit; 240, 540 - electronic device; 310, 311, 312, 313, 316, 317, 318, 320, 330, 340, 350, 360 - steps; 412 - track; 445 - first slot; 447 - second slot; A - axial direction. DETAILED DESCRIPTION

[0022] The foregoing and other technical contents, features and effects of the present application will be apparent from the following detailed description of the preferred embodiments, given by way of example only, which reference is made to the accompanying drawings. Directional terms used in the following embodiments, such as upper, lower, left, right, front, rear, bottom, top, etc., are only with reference to the orientation of the accompanying drawings. Therefore, the directional terms used are for illustration, not for limitation of the present application. In addition, in the following embodiments, the same or similar elements will use the same or similar reference numerals.

[0023] Reference will now be made to Figures 1 to 5 , Figure 1 is a perspective view of a linear motion device 10 according to an embodiment of the present application, Figure 2 is Figure 1 an exploded view of the linear motion device 10,Figure 3 yes Figure 1 A partial cross-sectional view of the linear transmission device 10. Figure 4 yes Figure 1 An exploded schematic diagram of the intermediate lubrication device 130. Figure 5 This is a functional block diagram of a detection module 200 and a signal receiving unit 230 according to an embodiment of the present invention. The linear transmission device 10 includes a long shaft 110, a moving member 120, two lubrication devices 130 and a detection module 200, and may optionally include a plurality of balls 160, two return elements 170 and an electronic device 240.

[0024] like Figure 1 , Figure 2 As shown, in this embodiment, the linear transmission device 10 is a ball screw, the long shaft 110 is a screw, and the moving member 120 is a nut. The outer surface 111 of the long shaft 110 has multiple external threaded grooves 112. The moving member 120 is disposed on the long shaft 110 such that it can be displaced along the axial direction A of the long shaft 110. The inner surface 121 of the moving member 120 has multiple internal threaded grooves 122. The internal threaded grooves 122 and the external threaded grooves 112 form a load channel and a return element 170, allowing the ball 160 to circulate between the load channel and the return element 170. In other embodiments, the linear transmission device 10 can be, but is not limited to, a linear guide or a ball spline. For example, when the linear transmission device 10 is a linear guide, the long shaft 110 can be a guide and the moving member 120 can be a slider; when the linear transmission device 10 is a ball spline, the long shaft 110 can be a spline shaft and the moving member 120 can be a spline nut.

[0025] like Figure 3 , Figure 4 As shown, two lubrication devices 130 are respectively fixed at both ends of the movable member 120. Each lubrication device 130 includes a housing 140 and an oil-containing unit 150. The housing 140 is fixed at one end of the movable member 120 and forms a first accommodating space 143. In this embodiment, the housing 140 includes a first housing 141 and a second housing 142. The first housing 141 forms a first through hole 145 and an annular groove 146. The first through hole 145 is for the long shaft 110 to pass through, and the annular groove 146 surrounds the first through hole 145. The second housing 142 is assembled to the first housing 141 to form the first accommodating space 143 between the first housing 141 and the second housing 142. The second housing 142 forms a second through hole 147 for the long shaft 110 to pass through.

[0026] The oil-containing unit 150 is disposed in the first accommodating space 143 and is used to provide lubricating oil to the outer surface 111 of the long shaft 110. In the present embodiment, the oil-containing unit 150 comprises a solid lubricating material 151 and a guide portion 152. The material of the solid lubricating material 151 can comprise lubricating oil and a lubricating oil carrier (such as a high polymer material, a synthetic resin, Teflon, paraffin, etc.), and the material of the guide portion 152 is a material capable of absorbing lubricating oil, such as a sponge or a felt. The solid lubricating material 151 is disposed in the ring groove 146, and the guide portion 152 is adjacent to the solid lubricating material 151 and seals the ring groove 146, and the lubricating oil released by the solid lubricating material 151 is transmitted to the outer surface 111 of the long shaft 110 through the guide portion 152. In the present embodiment, the guide portion 152 also has the function of an oil seal.

[0027] As shown in Figure 3 , Figure 4 , Figure 5 , the detection module 200 comprises a temperature sensing unit 210 and a control unit 220. The temperature sensing unit 210 is disposed in the housing 140 and adjacent to the oil-containing unit 150, and the temperature sensing unit 210 is used to detect the current temperature of the oil-containing unit 150. In the present embodiment, the number of temperature sensing units 210 is two, which corresponds to the number of lubricating devices 130, and the two temperature sensing units 210 are respectively disposed in the housings 140 of the two lubricating devices 130 and respectively measure the current temperatures of the two oil-containing units 150, that is, according to the linear transmission device 10 of the present application, the remaining amount of lubricating oil in the plurality of oil-containing units 150 can be monitored respectively. The aforementioned "the temperature sensing unit 210 is disposed in the housing 140 and adjacent to the oil-containing unit 150" means that the temperature sensing unit 210 can be disposed on the outer surface of the housing 140, on the inner surface of the housing 140, or in the first accommodating space 143 of the housing 140 (i.e. the temperature sensing unit 210 can be fixed on other elements instead of being fixed on the housing 140), and the position where the temperature sensing unit 210 is disposed is adjacent to the oil-containing unit 150, and the closer the position where the temperature sensing unit 210 is disposed to the oil-containing unit 150, the closer the temperature detected by the temperature sensing unit 210 to the actual temperature of the oil-containing unit 150. In the present embodiment, the temperature sensing unit 210 is disposed in the first accommodating space 143 of the housing 140 and on the solid lubricating material 151. More specifically, the temperature sensing unit 210 is disposed between the groove bottom 146a of the ring groove 146 and the solid lubricating material 151, and one surface of the temperature sensing unit 210 faces the groove bottom 146a and the other surface faces the solid lubricating material 151.

[0028] As shown in Figure 5As shown, the control unit 220 is connected to the temperature sensing unit 210, and the connection between the control unit 220 and the temperature sensing unit 210 can be wired or wireless. The control unit 220 has computing capability. For example, the control unit 220 can be, but is not limited to, a central processing unit (CPU) or a computer containing a central processing unit, a mobile phone, or other electronic devices. Please refer to Figure 1 In the present embodiment, the linear transmission device 10 comprises an electronic device 240, which is disposed on the housing 140 of the lubricating device 130, and the control unit 220 is disposed inside the electronic device 240. The electronic device 240 further comprises a signal receiving unit 230. In the present embodiment, the signal receiving unit 230 is a display screen, and the signal receiving unit 230 is connected to the control unit 220, and the connection between the signal receiving unit 230 and the control unit 220 can be wired or wireless. The signal receiving unit 230 is used to receive and display the signals transmitted by the control unit 220, such as the remaining amount of lubricating oil or warning signals. In this way, the staff located around the linear transmission device 10 can monitor the amount of lubricating oil of the linear transmission device 10 through the signals displayed by the signal receiving unit 230. In other embodiments, the control unit 220 and the signal receiving unit 230 can be remote devices, and can be integrated in the same electronic device, can be disposed in different electronic devices, or can be independent electronic devices. For example, the linear transmission device 10 is disposed on a machine table in a factory, and the control unit 220 and the signal receiving unit 230 can be integrally disposed in a computer located in an office, so that the staff can remotely monitor the linear transmission device 10 in the office, or the control unit 220 can be a computer disposed in an office, and the signal receiving unit 230 can be a mobile phone of the staff, so as to facilitate the staff to remotely monitor the amount of lubricating oil of the linear transmission device 10 at different locations.

[0029] For reference Figure 6 It is a flowchart of the steps of monitoring the amount of lubricating oil by the control unit 220, the control unit 220 is configured to perform steps 310 to 340, and can optionally perform steps 350 and 360. Step 310 is to establish an oil release model; step 320 is to receive the current temperature; step 330 is to calculate the remaining amount of lubricating oil in the oil-containing unit 150 according to the current temperature and the oil release model; step 340 is to output the remaining amount; step 350 is to determine whether the remaining amount is less than a threshold value; and step 360 is to issue a warning signal.

[0030] Regarding step 310, since the solid lubricant 151 has different oil release rates at different temperatures, step 310 can be used to collect the data of the temperature and the oil release rate of the same solid lubricant 151 to establish the oil release model of the solid lubricant 151. In addition, since different solid lubricants 151 of different materials / models / viscosities have different oil release rates at the same temperature, step 310 can be used to establish the oil release model of each solid lubricant 151 of different materials / models / viscosities. How to collect the data of the temperature and the oil release rate of the same solid lubricant 151 to establish the oil release model of the solid lubricant 151 will be described below.

[0031] With reference to Figure 7 FIG. 11 is a flowchart of a step of establishing an oil release model according to an embodiment of the present application, which includes steps 311 and 312 and can optionally include step 313. Step 311 is to preset a plurality of reference temperatures, which are different from each other; step 312 is to calculate an oil release rate of the oil-containing unit 150 per unit time corresponding to each reference temperature; and step 313 is to fit the plurality of reference temperatures and the plurality of oil release rates to obtain a fitting equation.

[0032] In step 311, the reference temperatures can be selected according to the working temperature range of the linear transmission device 10 and the desired accuracy. For example, if the working temperature range of the linear transmission device 10 is 30-70°C, every 20-degree temperature point in this temperature range can be selected as a reference temperature, i.e., 30°C, 50°C, 70°C, etc. For another example, every 10-degree temperature point in this temperature range can be selected as a reference temperature, i.e., 30°C, 40°C, 50°C, 60°C, 70°C, etc. The smaller the temperature interval between the reference temperatures, the higher the accuracy. According to an embodiment of the present application, the temperature interval between the reference temperatures is 10°C.

[0033] Regarding step 312, with reference to Figure 8, which is a flow chart of the step of calculating the oil release rate of the oil-containing unit 150 per unit time at each reference temperature according to an embodiment of the present application, and includes steps 316-318. Step 316 is measuring an initial weight of the oil-containing unit 150 at each reference temperature; step 317 is measuring an oil-released weight of the oil-containing unit 150 at each reference temperature after a predetermined time; and step 318 is calculating the oil release rate per unit time at each reference temperature according to the initial weight, the oil-released weight and the predetermined time. For example, in step 316, the initial weight of the oil-containing unit 150 at 30°C is Wi grams, in step 317, the oil-released weight of the oil-containing unit 150 at 30°C after 1 hour is Wf grams, and in step 318, the oil release rate per minute of the oil-containing unit 150 at 30°C is (Wf-Wi) / 60, in units of grams per minute (g / min). When the oil-containing unit 150 includes the solid lubricating material 151 and the guide portion 152, since the lubricating oil is provided by the solid lubricating material 151, the guide portion 152 itself is not consumed, and the oil release rate per unit time of the oil-containing unit 150 at each reference temperature can also be regarded as the oil release rate per unit time of the solid lubricating material 151 at each reference temperature. From the foregoing calculation method, the "oil release rate" of the present application refers to the oil release rate per unit time, and is sometimes simply referred to as the oil release rate for the sake of brevity. Through step 312, the oil release rate per unit time of the oil-containing unit 150 at different reference temperatures can be obtained, i.e., a database of the reference temperatures and the oil release rates of the oil-containing unit 150 can be established.

[0034] Step 313 is further processing the data obtained in step 312 to obtain a fitting equation. The fitting equation can be calculated according to the principles of polynomials, least squares method, regression analysis, etc. In addition, the fitting equation can be calculated using known calculation software such as Excel.

[0035] In other words, according to the oil release model of the present application, it can be the database of the reference temperatures and the oil release rates obtained in step 312, or the fitting equation obtained by fitting the data of the database. The oil release model can be used as a basis for estimating the remaining amount of lubricating oil in the oil-containing unit 150.

[0036] Please refer back to Figure 6 , in step 330, the calculation method of the remaining amount of lubricating oil is as follows: assuming that the remaining amount of lubricating oil is W2, the initial weight of the lubricating oil is W1, the oil release rate at the reference temperature t is R t , and the oil release time is T, the oil release amount M of the lubricating oil can be obtained according to formula (I), and the remaining amount of the lubricating oil can be obtained according to formula (II):

[0037] M = R t × T …… (I);

[0038] W2 = (W1-M) …… (II);

[0039] The units for W1, W2, and M can be units of weight, such as grams (g); R t The unit of can be a weight unit or a time unit, such as grams per minute (g / min); the unit of T can be a time unit, such as minutes (min).

[0040] The following will provide practical examples to illustrate steps 320 and 330. Please refer to Table 1 for usage examples. Figures 1 to 4 The linear transmission device 10 and the solid lubricant 151 have a viscosity of 68 cst. Based on the oil release model obtained in steps 311 and 312, the oil release model is a database of reference temperature and oil release rate.

[0041]

[0042] Assumption Figure 6 The detection frequency is 1 time / min, meaning the control unit 220 performs step 320 once per minute. If the temperature at the time of step 320 is 40℃, then, as shown in Table 1, the oil release rate R... 40 3.0141×10 -4 g / min, with the time interval between two detections as the oil release time, which is 1 min in this case, the oil release amount M can be obtained according to equations (I) and (II) as 3.0141 × 10 g / min. - 4 g / min×1min, remaining lubricating oil W2=W1-3.0141×10 -4 g / min×1min. The initial weight of the lubricating oil can be measured in advance. For example, the weight of a brand new, unused oil-containing unit 150 can be measured first, and then the weight of a used oil-containing unit 150 in which all lubricating oil has been released can be measured. The difference between the two is the initial weight of the lubricating oil (i.e., the weight of the lubricating oil when the linear drive 10 has been operating for 0 minutes). Substituting this into W1 in formula (II), the remaining amount of lubricating oil after the linear drive 10 has been operating for 1 minute can be calculated. When the second detection is performed (i.e., at the beginning of the second minute of operation of the linear drive 10), the remaining amount of lubricating oil after the linear drive 10 has been operating for 1 minute is used as the initial weight of the lubricating oil at the second detection. Then, according to formulas (I) and (II), the amount of oil released and the remaining amount of lubricating oil in the second minute can be calculated. The remaining amount of lubricating oil after the linear drive 10 has been operating for 2 minutes can be calculated. And so on, the remaining amount of lubricating oil after the linear drive 10 has been operating for 1 minute can be calculated.

[0043] Assuming the current temperature received by the control unit 220, the corresponding oil release rate is calculated by interpolation or extrapolation if the corresponding oil release rate is not available in the database. For example, the current temperature of step 320 is 42.5°C, the oil release rate R of 42.5°C is calculated by interpolation, and the calculation method is shown in equation (III): 42.5 R = 0.0001 x (T - 30)2+ 0.0005 x (T - 30) + 0.0005

[0044]

[0045] For another example, the current temperature of step 320 is 74°C, the oil release rate R of 74°C is calculated by extrapolation, and the calculation method is shown in equation (IV): 74 R = 0.0001 x (T - 70)2+ 0.0005 x (T - 70) + 0.0005

[0046]

[0047] After the oil release rate is calculated, the remaining amount of lubricating oil can be calculated by substituting equations (I) and (II).

[0048] Please refer to Figure 9 which is a reference temperature and oil release rate relationship diagram according to an embodiment of the present application, which is plotted with the data in Table 1. By observing the method, it is determined that the oil release rate and temperature curve is approximately a quadratic polynomial, and a fitting equation of the form (V) can be obtained according to step 313. First, assume y = ax 2 + bx + c, and then substitute the temperature points at 30, 50, and 70 degrees:

[0049]

[0050] and solve for a, b, and c to obtain the fitting equation as follows:

[0051] y = 1.1451 x 10 -6 x 2 - 6.1049 x 10 -5 x + 9.1827 x 10 -4 (V).

[0052] In equation (V), y is the oil release rate, and x is the reference temperature / current temperature. The current temperature obtained in step 320 is substituted into x in equation (V) to obtain the oil release rate corresponding to the current temperature, and then substituted into equations (I) and (II) to calculate the remaining amount of lubricating oil. According to an embodiment of the present application, the oil release rate calculated according to the fitting equation of equation (V) is 1.502%, and the actual oil release rate is 1.15%, the difference between the two is 0.352%. It shows that the present application can accurately estimate the oil release rate, and further accurately estimate the remaining amount of lubricating oil, and effectively monitor the amount of lubricating oil of the linear transmission device 10.

[0053] Please refer to Figure 6Step 340 is outputting the remaining amount, i.e. the control unit 220 transmits the remaining amount to the signal receiving unit 230. Step 350 is judging whether the remaining amount is less than a threshold value, which is pre-set, for example, the threshold value can be 0 gram or 10% of the initial weight of the lubricating oil at the beginning. When the remaining amount is less than the threshold value, it indicates that the lubricating oil is running out or will run out, at this time, step 360 is performed, the control unit 220 sends out a warning signal, which can be a sound signal and / or a light signal, at this time, the signal receiving unit 230 can be configured with a sound module and / or a light module to send out the sound signal and / or the light signal; when the remaining amount is greater than or equal to the threshold value, it indicates that the lubricating oil is sufficient, and returns to step 320 to continue detection. Steps 350 and 360 are optional steps, in other embodiments, when steps 350 and 360 are not included, step 340 is performed and then returns to step 320. In addition, the oil release model can be pre-established, once the oil release model is established, the subsequent detection can directly start from step 320.

[0054] From the above, it can be seen that the linear transmission device 10 of the present application can monitor the amount of lubricating oil in real time, and by means of the oil release model and the current temperature of the oil containing unit 150, the remaining amount of lubricating oil can be estimated, so that the lubricating oil can be known to run out or will run out in real time.

[0055] Please refer to Figure 10 , which is an exploded schematic view of the lubricating device 130' according to another embodiment of the present application. The first shell 141' is formed with a first through hole 145' and a ring groove 146', and the difference from the lubricating device 130 is that the inner ring wall 148' is formed with a second accommodation space 144', which is in communication with the first accommodation space 143', and the temperature sensing unit 210 is arranged in the second accommodation space 144', one surface of the temperature sensing unit 210 faces the inner ring wall 148' and the other surface faces the solid lubricating material 151, and the second accommodation space 144' can match the shape of the temperature sensing unit 210, so that the temperature sensing unit 210 can be embedded therein. In this way, the positioning effect of the temperature sensing unit 210 can be improved. For other details of the lubricating device 130', reference can be made to the related description of the lubricating device 130 without contradiction.

[0056] Please refer to Figure 11 , Figure 12 , Figure 11 is a perspective view of the linear transmission device 40 according to another embodiment of the present application, Figure 12 is Figure 11An exploded view of the lubricating device 430. The linear transmission device 40 comprises a long shaft 410, a moving member 420, two lubricating devices 430, a detection module (not labeled separately), and optionally an electronic device 540. In the present embodiment, the linear transmission device 40 is a linear slide, the long shaft 410 is a slide rail, and the moving member 420 is a slide block. The moving member 420 is arranged on the long shaft 410 in a manner that is displaceable along the axial direction A of the long shaft 410.

[0057] Each of the two lubricating devices 430 is fixedly arranged at one end of the moving member 420. Each of the lubricating devices 430 comprises a housing 440 and two oil-containing units 450. The housing 440 is fixedly arranged at one end of the moving member 420. In the present embodiment, the housing 440 comprises a first housing 441 and a second housing 442. The first housing 441 is an end cap, and the second housing 442 is an oil scraping sheet. The first housing 441 is formed with a first slot 445 for the long shaft 410 to pass through, and two first accommodating spaces 443 arranged on both sides of the first slot 445 and communicating with the first slot 445. The second housing 442 is assembled to the first housing 441, and the second housing 442 is formed with a second slot 447 for the long shaft 410 to pass through.

[0058] The oil-containing unit 450 is used to provide a lubricating oil to an outer surface 411 of the long shaft 410. Each of the oil-containing units 450 comprises a solid lubricating material 451 and a guide portion 452. The oil-containing unit 450 is arranged in the first accommodating space 443, and the guide portion 452 is adjacent to the solid lubricating material 451. The guide portion 452 protrudes from the first accommodating space 443 into the first slot 445, and the protruding length of the guide portion 452 corresponds to the recess depth of the track 412 on the long shaft 410. Thus, the lubricating oil released by the solid lubricating material 451 can be transmitted to the outer surface 411 of the long shaft 410 through the guide portion 452.

[0059] The detection module comprises a temperature sensing unit 510 and a control unit (not shown in the figure). The temperature sensing unit 510 is arranged in the housing 440 and adjacent to the oil-containing unit 450. In the present embodiment, the number of the temperature sensing unit 510 is four, and each of the lubricating devices 430 comprises two temperature sensing units 510. The two temperature sensing units 510 are arranged in the two first accommodating spaces 443 of the first housing 441, respectively, and measure the current temperature of the two oil-containing units 450, respectively. The control unit is arranged inside the electronic device 540. The electronic device 540 further comprises a signal receiving unit 530. In the present embodiment, the signal receiving unit 530 is a display screen.

[0060] For other details of the linear transmission device 40, reference can be made to the related descriptions of the linear transmission device 10 without contradiction.

[0061] Compared with the prior art, the linear transmission device of the application can estimate the remaining amount of lubricating oil by temperature, can know in real time that the lubricating oil is insufficient or will soon be exhausted, can arrange maintenance in time, is beneficial to prolong the service life, and is beneficial to the application of unmanned factories.

[0062] The above merely describes preferred embodiments of the application, and any equivalent changes and modifications made according to the claims of the application shall fall within the scope of the application.

Claims

1. A linear transmission device capable of real-time monitoring of lubricating oil quantity, characterized in that, Include: One long axis; A movable component is disposed on the long axis in such a way that it can be displaced along the axial direction of the long axis; A lubrication device, comprising: A housing, fixed to one end of the movable member, the housing forming a first accommodating space; and An oil-impregnating unit is disposed in the first accommodating space, the oil-impregnating unit being used to provide a lubricating oil to an outer surface of the long shaft; and A detection module, comprising: A temperature sensing unit is disposed in the housing and adjacent to the oil-containing unit, the temperature sensing unit being used to detect a current temperature of the oil-containing unit; and A control unit, connected to the temperature sensing unit, is configured to perform: Establish an oil release model, including: Multiple reference temperatures are preset, and these reference temperatures are different from each other; and Calculate the oil release rate per unit time for each reference temperature in the oil-bearing unit; Receive the current temperature; Based on the current temperature and the oil release model, calculate the remaining amount of lubricating oil in the oil-containing unit; and Output the remaining amount.

2. The linear transmission device capable of real-time monitoring of lubricating oil quantity as described in claim 1, characterized in that, The control unit is also configured to perform: The control unit determines whether the remaining amount is less than a threshold, and if the remaining amount is less than the threshold, the control unit issues a warning signal.

3. The linear transmission device capable of real-time monitoring of lubricating oil quantity as described in claim 1, characterized in that, The establishment of this oil release model also includes: The multiple reference temperatures and multiple oil release rates are fitted to obtain a fitting equation.

4. The linear transmission device capable of real-time monitoring of lubricating oil quantity as described in claim 1, characterized in that, The calculation of the oil release rate per unit time for each reference temperature in the oil-bearing unit includes: Measure the initial weight of the oil-containing unit at each of the reference temperatures; After a predetermined time, the weight of the oil-containing unit after oil release is measured at each of the reference temperatures. and The oil release rate per unit time at each reference temperature is calculated based on the initial weight, the weight after oil release, and the predetermined time.

5. The linear transmission device capable of real-time monitoring of lubricating oil quantity as described in claim 1, characterized in that, The oil-containing unit includes a solid lubricant and a guide portion, through which the lubricating oil released by the solid lubricant is transferred to the outer surface of the long shaft.

6. The linear transmission device capable of real-time monitoring of lubricating oil quantity as described in claim 5, characterized in that, The housing contains: A first housing having a first through hole and an annular groove, the first through hole through which the long shaft passes, and the annular groove surrounding the first through hole; and A second housing is assembled on the first housing, and the second housing has a second through hole for the long shaft to pass through; The solid lubricant is disposed within the annular groove, and the guide portion is adjacent to the solid lubricant and closes the annular groove.

7. The linear transmission device capable of real-time monitoring of lubricating oil quantity as described in claim 5, characterized in that, The temperature sensing unit is mounted on the solid lubricant.

8. The linear transmission device capable of real-time monitoring of lubricating oil quantity as described in claim 1, characterized in that... The housing has a second accommodating space that is connected to the first accommodating space, and the temperature sensing unit is disposed in the second accommodating space.

9. The linear transmission device capable of real-time monitoring of lubricating oil quantity as described in claim 1, characterized in that, The temperature sensing unit is disposed on an outer surface of the housing.

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