An extruder gearbox overload protection mechanism and extruder gearbox

Abstract

The present application relates to the technical field of extruders, and discloses an overload protection mechanism for a gear box of an extruder and the gear box of the extruder. The overload protection mechanism for the gear box of the extruder comprises a shaft coupling, a gear assembly and a temperature sensor. The shaft coupling comprises a locking mechanism and two half shaft couplings, one of which is connected to the proximal end of a main shaft, and the other is used to connect an output shaft, and the two half shaft couplings are connected through the locking mechanism. The gear assembly is arranged at the distal end of the main shaft and has an oil outlet channel penetrating in the radial direction thereof. The main shaft has an oil inlet channel. The oil inlet channel is connected to the locking mechanism and the oil outlet channel. When the pressure on the locking mechanism exceeds a threshold value, the locking mechanism is separated from the half shaft couplings. The gear box of the extruder comprises the temperature sensor, a box body and the overload protection mechanism for the gear box of the extruder. The present application solves the technical problem that the overload protection mechanism in the related art cannot protect the gear box and gears within the range of the rated working condition and the maximum overload working condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of extruders, in particular to an extruder gearbox overload protection mechanism and an extruder gearbox. BACKGROUND

[0002] The extruder gearbox overload protection mechanism is a core component for safe operation of the extruder, and its main function is to quickly cut off power transmission when the screw encounters metal foreign matter or material blockage and other abnormal working conditions, so as to protect the expensive gearbox, transmission shaft and driving motor from devastating damage.

[0003] At present, the existing overload protection mechanism can only be disconnected from the output shaft under the maximum overload working condition, and cannot protect the gearbox and gears within the range interval between the rated working condition and the maximum overload working condition. SUMMARY

[0004] The present application discloses an extruder gearbox overload protection mechanism to solve the technical problem that the overload protection mechanism in the prior art cannot protect the gearbox and gears within the range interval between the rated working condition and the maximum overload working condition.

[0005] To solve the above problems, the present application adopts the following technical solutions:

[0006] In a first aspect, the present application discloses an extruder gearbox overload protection mechanism, comprising:

[0007] The shaft coupling comprises a locking mechanism and two half shaft couplings, one of which is connected to the proximal end of the main shaft, and the other is used to connect the output shaft, and the two half shaft couplings are connected through the locking mechanism;

[0008] The gear assembly is arranged at the distal end of the main shaft and has an oil outlet channel extending radially therethrough;

[0009] The main shaft has an oil inlet channel, and the oil inlet channel is connected to an oil tank through an oil pump; one end of the oil inlet channel is connected to the locking mechanism, and the other end is connected to the oil outlet channel;

[0010] When the pressure acting on the locking mechanism exceeds a threshold value, the locking mechanism is separated from one of the half shaft couplings.

[0011] In some embodiments, the locking mechanism comprises a moving plate, an elastic member and a locking portion, one of the half shaft couplings has an oil cavity in communication with the oil inlet channel, the moving plate is slidably arranged in the oil cavity through the elastic member on one side, and the other side is connected to the locking portion;

[0012] The other half shaft coupling is provided with a limiting groove corresponding to the locking portion, and one end of the locking portion extends into the limiting groove through the half shaft coupling; when the pressure acting on the moving plate exceeds a threshold value, the locking portion is separated from the limiting groove.

[0013] In some schemes, the locking mechanisms are multiple and equidistantly arranged along the circumference of the half-coupling;

[0014] And / or, the locking part is connected with the half-coupling through a sealing structure.

[0015] In some schemes, the half-coupling provided with the oil cavity is further provided with an intermediate chamber, and the multiple oil cavities are respectively communicated with the oil inlet channel through the intermediate chamber.

[0016] In some schemes, the gear assembly comprises a gear body and an oil outlet ring, the gear body is connected with the distal end of the main shaft, and the oil outlet ring is sleeved on the gear body.

[0017] The oil outlet channel penetrates the gear body and the oil outlet ring along the radial direction of the gear body.

[0018] In some schemes, the oil outlet channel comprises a first oil outlet part, a second oil outlet part and a third oil outlet part, the first oil outlet part penetrates the gear body along the radial direction of the gear body and is communicated with the oil inlet channel, the second oil outlet part is arranged on at least one contact surface between the gear body and the oil outlet ring along the circumferential direction of the gear assembly, and the third oil outlet part penetrates the oil outlet ring along the radial direction of the oil outlet ring and is communicated with the second oil outlet part.

[0019] In some schemes, the third oil outlet part is multiple and equidistantly arranged along the circumferential direction of the oil outlet ring.

[0020] And / or, the gear body has an annular groove, the oil outlet ring is sleeved in the annular groove, and the diameter of the oil outlet ring is smaller than the diameter of the gear body.

[0021] In some schemes, the extruder gearbox overload protection mechanism further comprises a water slide ring, the water slide ring is arranged on the main shaft and is communicated with the oil inlet channel, and the water slide ring is externally connected with an oil tank through an oil pump.

[0022] In some schemes, the oil inlet channel comprises a first oil inlet part, a second oil inlet part and a third oil inlet part, the first oil inlet part extends along the axial direction of the main shaft and is respectively connected with the gear assembly and the locking mechanism, the third oil inlet part is arranged on at least one contact surface between the water slide ring and the main shaft along the circumferential direction of the main shaft and is communicated with the oil inlet port of the water slide ring, and the second oil inlet part is arranged on the main shaft and is connected with the first oil inlet part and the third oil inlet part.

[0023] In the second aspect, the application further discloses an extruder gearbox, which comprises a temperature sensor, a box body and the extruder gearbox overload protection mechanism in the first aspect, the extruder gearbox overload protection mechanism is arranged on the box body, and the temperature sensor is arranged on the box body and used for monitoring the oil temperature in the box body.

[0024] The technical scheme adopted by the application can achieve the following beneficial effects:

[0025] The extruder gearbox overload protection mechanism of the present application, when exceeding the rated working condition, under the action of the oil pump, the lubricating oil in the oil tank will also pass through the oil inlet channel to act on the locking mechanism, at this time, the pressure of the lubricating oil applied to the locking mechanism is not enough to make the locking mechanism separate from the half-coupling, thereby ensuring the continuous and effective driving connection, and at the same time, the operating conditions under overload working condition are actively improved; as the overload further increases, until exceeding the maximum overload working condition, the jet pressure of the oil pump increases, thereby increasing the pressure of the lubricating oil acting on the locking mechanism, so that the locking mechanism separates from the half-coupling, thereby immediately cutting off the power to protect the main shaft and the output shaft. Therefore, the extruder gearbox overload protection mechanism of the present application not only can provide final safety protection under extreme overload like the traditional device, but also can actively suppress the deterioration of the lubricating oil by improving the lubricating effect in the early stage of overload to avoid unnecessary shutdown, thereby ensuring safety while significantly improving the continuous operation efficiency of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is an isometric view of the extruder gearbox disclosed in some embodiments of the present application;

[0028] Figure 2 is Figure 1 is an enlarged view of A in FIG. 1;

[0029] Figure 3 is a top view of the extruder gearbox disclosed in some embodiments of the present application;

[0030] Figure 4 is Figure 3 is a sectional view of a-a in FIG. 2;

[0031] Figure 5 is Figure 4 is an enlarged view of B in FIG. 2;

[0032] Figure 6 is Figure 4 is an enlarged view of C in FIG. 2;

[0033] Figure 7 is Figure 6 is an enlarged view of E in FIG. 2;

[0034] Figure 8 is Figure 4 is an enlarged view of D in FIG. 2;

[0035] Figure 9 is an axonometric view of a half-coupling disclosed in some embodiments of the present application;

[0036] Figure 10 is an axonometric view of a gear body disclosed in some embodiments of the present application.

[0037] in the figure:

[0038] 100-extruder gearbox overload protection mechanism, 110-main shaft, 120-gear assembly, 121-gear body, 1211-annular groove, 122-oil outlet ring, 130-coupling, 131-half-coupling, 1311-oil cavity, 1312-intermediate chamber, 1313-limiting groove, 132-locking mechanism, 1321-moving plate, 1322-locking part, 1323-elastic member, 140-water slide ring, 150-oil inlet channel, 151-first oil inlet part, 152-second oil inlet part, 153-third oil inlet part, 160-oil outlet channel, 161-first oil outlet part, 162-second oil outlet part, 163-third oil outlet part, 170-sealing structure;

[0039] 200-extruder gearbox, 210-gearbox body. DETAILED DESCRIPTION

[0040] In order to make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0041] The terms "first", "second" and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second" and the like are generally of a kind, and are not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0042] The inventor found in the production process that the existing overload protection mechanism can only be disconnected from the output shaft under the maximum overload condition, and cannot protect the gearbox and gears within the range between the rated condition and the maximum overload condition.

[0043] Specifically, when the gear box of the extruder is not overloaded, it does not affect the continuous operation of the equipment (for example, the working condition of the extruder changes temporarily and for a short time, which may be an increase in extrusion speed, a decrease in extrusion temperature, a problem with the heating device causing the material temperature to be lower and the flowability to be lower, resulting in an increase in extrusion resistance), but due to the increase in the force between the tooth surfaces (change in stress caused by overload), the operating temperature between the parts will gradually increase. At this time, the design redundancy of the general part can ensure that the part is not damaged during this period, but the efficiency is reduced, which will cause more energy to be converted into temperature, causing the temperature to rise. The temperature of the local contact part will eventually spread, causing the overall temperature of the gear box (such as the lubricating oil) to rise, and thus the viscosity of the lubricating oil will continue to decrease, the flowability will increase, and the oil film thickness and integrity of the part surface will decrease. The changes in the oil film will cause the contact surface between the parts to be unprotected, resulting in wear and tear, and other situations (this is not caused by excessive overload, but by the performance of the oil caused by temperature), which will damage the parts.

[0044] The extruder gear box overload protection mechanism 100 and the extruder gear box 200 provided by the present application will be described in detail below in combination with the accompanying drawings Figures 1 to 10 , through specific examples and application scenarios.

[0045] Some embodiments of the present application disclose an extruder gear box overload protection mechanism 100, which comprises a shaft coupling 130, a gear assembly 120, a main shaft 110 and a water slide ring 140.

[0046] As shown in Figure 4 and Figure 5 , the shaft coupling 130 comprises a locking mechanism 132 and two half shaft couplings 131, one of which is connected to the proximal end of the main shaft 110, and the other is used to connect the output shaft, and the two half shaft couplings 131 are connected through the locking mechanism 132. When the torque borne by the device exceeds the preset threshold, the locking mechanism 132 will quickly separate from the half shaft coupling 131, thereby actively cutting off the power transmission, which can effectively prevent sudden and large overloads from causing catastrophic mechanical damage to the output shaft, the main shaft 110 and other core components, thereby improving the reliability and service life of the device, and minimizing downtime losses caused by equipment damage.

[0047] In this embodiment, the proximal end of the main shaft 110 refers to the end extending into the interior of the extruder gear box 200.

[0048] As shown in Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the gear assembly 120 is arranged at the distal end of the main shaft 110, and has an oil outlet channel 160 extending radially therethrough, the main shaft 110 has an oil inlet channel 150, the oil inlet channel 150 is connected with the oil outlet channel 160 and is connected with an oil tank outside the oil pump. When the load exceeds the rated load, the oil pump pumps the lubricating oil with lower temperature in the oil tank into the oil inlet channel 150 of the main shaft 110, and the lubricating oil is preheated by absorbing the heat transferred by the main shaft 110 during flowing through the oil inlet channel 150 to the distal gear set. The preheated lubricating oil has better viscosity, and when it is finally sprayed to the gear meshing surface with increased temperature due to overload through the oil outlet channel 160, it can more effectively form a protective oil film, avoiding the thermal stress that may be caused by the direct impact of cold oil on the hot gear surface, and significantly improving the thermal stability and operation reliability of the extruder gearbox 200 under overload conditions.

[0049] In the embodiment, the distal end of the main shaft 110 refers to the end extending to the outside of the extruder gearbox 200.

[0050] As shown in Figure 4 and Figure 5 The oil inlet channel 150 is also connected with the locking mechanism 132, and when the pressure acting on the locking mechanism 132 exceeds a threshold value, the locking mechanism 132 is separated from one of the half-couplings 131. When the load exceeds the rated load, the lubricating oil in the oil tank also acts on the locking mechanism 132 through the oil inlet channel 150 under the action of the oil pump, and at this time, the pressure of the lubricating oil acting on the locking mechanism 132 is not enough to separate the locking mechanism 132 from the half-coupling 131, thereby ensuring that the driving connection continues to be effective, and at the same time actively improving the operating conditions under overload conditions; as the overload further increases, until the maximum overload condition is exceeded, the injection pressure of the oil pump increases, thereby increasing the pressure of the lubricating oil acting on the locking mechanism 132, so that the locking mechanism 132 is separated from the half-coupling 131, thereby immediately cutting off the power to protect the main shaft 110 and the output shaft. Therefore, the extruder gearbox overload protection mechanism 100 of the present application not only can provide final safety protection when the load is extremely high like the traditional device, but also can actively suppress the deterioration of the lubricating oil by improving the lubricating effect at the initial stage of overload, thereby avoiding unnecessary shutdown, so as to ensure safety while significantly improving the continuous operation efficiency of the equipment.

[0051] As preferred in the embodiment, the locking mechanism 132 is arranged at one of the half-couplings 131 close to the distal end of the main shaft 110, so that the lubricating oil directly reaches the locking mechanism 132 through the oil inlet channel 150, and the path is simple and the pressure loss is small.

[0052] As shown in Figure 5As shown, the locking mechanism 132 includes a moving plate 1321, an elastic member 1323 and a locking portion 1322, wherein one half-coupling 131 has an oil cavity 1311 communicating with the oil passage 150, the moving plate 1321 is slidably arranged in the oil cavity 1311 by the elastic member 1323 on one side, and is connected with the locking portion 1322 on the other side. In normal working conditions, the pre-tightening force of the elastic member 1323 keeps the moving plate 1321 in place, and the locking portion 1322 is in meshing state to transmit torque; when the system is overloaded, the hydraulic oil enters the oil cavity 1311 and acts on one side of the moving plate 1321, when the pressure generated is enough to overcome the resistance of the elastic member 1323 on the other side, the moving plate 1321 is pushed to slide, driving the locking portion 1322 to disengage, thereby cutting off the power transmission.

[0053] As preferred in the embodiment, the elastic member 1323 is a spring.

[0054] As shown in Figure 5 and Figure 9 As shown, the other half-coupling 131 is provided with a limiting groove 1313 corresponding to the locking portion 1322, and one end of the locking portion 1322 extends into the limiting groove 1313 through the half-coupling 131; when the pressure on the moving plate 1321 exceeds the threshold value, the locking portion 1322 is separated from the limiting groove 1313. Through the rigid engagement of the locking portion 1322 and the limiting groove 1313, the firmness of the connection of the two half-couplings 131 is ensured during normal torque transmission; when overload occurs, the locking portion 1322 can be separated from the limiting groove 1313 to completely interrupt the power transmission.

[0055] As shown in Figure 5 The locking mechanism 132 is arranged equidistantly along the circumference of the half-coupling 131. The equidistant arrangement of the plurality of locking mechanisms 132 along the circumference of the half-coupling 131 makes the transmission torque evenly dispersed to each locking portion 1322, avoiding local wear or early failure caused by stress concentration, and significantly improving the carrying capacity and stability of the coupling 130. When overload occurs, all locking mechanisms 132 can respond synchronously and be disconnected at the same time, ensuring that the power is cut off instantly and completely, preventing additional bending moment or vibration caused by asymmetric disconnection from causing secondary damage to the main shaft 110, gear and other key components, thereby enhancing the reliability of the overload protection system and the overall operation safety.

[0056] As shown in Figure 5As shown, the locking portion 1322 is connected with the half-coupling 131 through a sealing structure 170. The sealing structure 170 ensures that the oil cavity 1311 has sufficient sealing, effectively preventing lubricating oil from leaking from the fitting gap between the locking portion 1322 and the half-coupling 131, not only maintaining stable oil pressure to ensure the accuracy and reliability of the overload protection threshold, but also avoiding the intrusion of external pollutants, thereby ensuring the accuracy and consistency of the action of the locking mechanism 132.

[0057] As shown, Figure 5 The half-coupling 131 provided with the oil cavity 1311 is also provided with an intermediate chamber 1312, and the plurality of oil cavities 1311 are respectively communicated with the oil inlet channel 150 through the intermediate chamber 1312. The intermediate chamber 1312 serves as a common hydraulic distributor, ensuring that the lubricating oil flowing from a single oil inlet channel 150 can be simultaneously and equally distributed to each independent oil cavity 1311 arranged in a circumferential direction, thereby driving all locking mechanisms 132 to achieve precise synchronous action. This not only avoids individual locking mechanisms 132 response delay or misoperation caused by oil pressure transmission path difference or pressure fluctuation, ensuring smooth and complete power cut-off during overload, but also simplifies the oil circuit layout, making the structure more compact and reliable.

[0058] As shown, Figure 2 and Figure 6 The gear assembly 120 includes a gear body 121 connected with the distal end of the main shaft 110 and an oil outlet ring 122 sleeved on the gear body 121. The oil outlet channel 160 penetrates the gear body 121 and the oil outlet ring 122 in the radial direction of the gear body 121. Under the action of the oil pump, the lubricating oil flows from the oil tank through the oil inlet channel 150 into the gear body 121, and at the same time passes through the oil outlet channel 160 penetrating the gear body 121 and the oil outlet ring 122 in the radial direction, forming a uniform oil curtain around the gear meshing area. The oil outlet ring 122 expands the spraying coverage of the lubricating oil, ensuring that the lubricating oil can more fully and uniformly wrap the gear meshing surface, not only greatly improving the heat dissipation and lubrication effect, but also effectively avoiding the problem of local lubrication deficiency that may be caused by direct oil injection, thereby providing comprehensive protection for the gear in harsh working conditions and prolonging the service life of the gear.

[0059] As shown, Figure 6 and Figure 7As shown, the oil outlet channel 160 includes a first oil outlet 161, a second oil outlet 162, and a third oil outlet 163. The first oil outlet 161 penetrates the gear body 121 radially and communicates with the oil inlet channel 150. The second oil outlet 162 is arranged circumferentially along the gear assembly 120 at at least one contact surface between the gear body 121 and the oil outlet ring 122. The third oil outlet 163 penetrates the oil outlet ring 122 radially and communicates with the second oil outlet 162. After the lubricating oil flows in from the oil inlet channel 150, it first undergoes primary distribution through the first oil outlet 161, then enters the second oil outlet 162 formed by the contact surface between the gear body 121 and the oil outlet ring 122 to achieve pressure equalization and flow storage, and finally is evenly sprayed from the oil outlet ring 122 to the gear meshing area through the third oil outlet 163. The second oil outlet 162 in the circumferential direction acts as a pressure-stabilizing ring cavity, ensuring that the pressure and flow rate of the lubricating oil sprayed from the third oil outlet 163 are stable, thereby forming a continuous and uniform oil film protective layer on the entire meshing surface of the gear, which greatly improves the uniformity and reliability of lubrication and cooling, and eliminates the risk of local overheating or insufficient lubrication.

[0060] In some embodiments, the second oil outlet 162 is disposed on the contact surface of the gear body 121.

[0061] In some embodiments, the second oil outlet 162 is disposed on the contact surface of the second oil inlet 152.

[0062] In some embodiments, the second oil outlet 162 is respectively disposed on the contact surface of the gear body 121 and the second oil inlet 152.

[0063] Multiple third oil outlets 163 are arranged equidistantly along the circumference of the oil outlet ring 122. This equidistant arrangement of multiple third oil outlets 163 along the circumference of the oil outlet ring 122 forms a continuous and uniform annular oil curtain around the gear meshing area. This ensures that the lubricating oil can evenly cover the entire tooth surface of the gear from all directions, completely eliminating the problem of insufficient localized cooling and lubrication that may be caused by a single or unevenly distributed spray point. This greatly improves lubrication efficiency and heat dissipation uniformity, effectively preventing localized overheating or abnormal wear of the gears.

[0064] like Figure 2 , Figure 6 and Figure 10 As shown, the gear body 121 has an annular groove 1211, and an oil outlet ring 122 is fitted inside the annular groove 1211, with the diameter of the oil outlet ring 122 being smaller than the diameter of the gear body 121. This design, where the oil outlet ring 122 is embedded within the annular groove 1211 of the gear body 121 and its diameter is smaller than that of the gear body 121, ensures that the oil outlet ring 122 does not affect the normal meshing of the gear set, avoiding meshing interference, vibration, or efficiency loss that may be caused by additional parts, thus balancing the dual needs of transmission and lubrication.

[0065] As shown in Figure 1 and Figure 3 , the water slide ring 140 is arranged on the main shaft 110 and communicates with the oil inlet channel 150; the water slide ring 140 is connected with the oil tank through the oil pump. By arranging the water slide ring 140 on the main shaft 110 and communicating it with the oil inlet channel 150, the lubricating oil is conveniently transported to the rotating main shaft 110, so that the oil pump can continuously and stably pump the lubricating oil from the oil tank to the continuously rotating main shaft 110, so as to ensure the temperature of the lubricating oil pressure.

[0066] It should be noted that the core structure of the water slide ring 140 mainly consists of rotating and stationary parts, the rotating part usually includes a rotor rotating with the main shaft 110, which is internally provided with an annular oil groove and is connected with the oil inlet channel 150 of the main shaft 110 through an axial hole; the stationary part is a fixed stator, which is provided with an oil inlet port connected with the oil pump and the oil tank through a pipeline.

[0067] As shown in Figure 8 , the oil inlet channel 150 includes a first oil inlet part 151, a second oil inlet part 152 and a third oil inlet part 153, the first oil inlet part 151 extends along the axial direction of the main shaft 110 and is connected with the gear assembly 120 and the locking mechanism 132 respectively, the third oil inlet part 153 is arranged on at least one contact surface between the water slide ring 140 and the main shaft 110 along the circumferential direction of the main shaft 110 and communicates with the oil inlet port of the water slide ring 140, and the second oil inlet part 152 is arranged on the main shaft 110 and connected with the first oil inlet part 151 and the third oil inlet part 153. The lubricating oil enters the circumferentially arranged third oil inlet part 153 from the oil inlet port of the water slide ring 140 to realize the introduction and preliminary pressure equalization of the lubricating oil; then the lubricating oil is diverted and distributed to the axially extending first oil inlet part 151 through the second oil inlet part 152, and finally is accurately transported to the gear assembly 120 and the locking mechanism 132. The circumferential third oil inlet part 153 ensures the smooth transition of oil from the stationary part to the rotating part, reducing the risk of leakage; the axial first oil inlet part 151 serves as the main channel to realize long-distance accurate oil supply, and the overall structure not only ensures the reliable transmission of lubrication and hydraulic power, but also greatly optimizes the space utilization efficiency inside the main shaft 110.

[0068] In some embodiments, the second oil inlet part 152 is arranged on the contact surface of the water slide ring 140.

[0069] In some embodiments, the second oil inlet part 152 is arranged on the contact surface of the main shaft 110.

[0070] In some embodiments, the second oil inlet part 152 is arranged on the contact surface of the water slide ring 140 and the main shaft 110 respectively.

[0071] Some embodiments of the present application also disclose an extruder gearbox 200, comprising a temperature sensor, a gearbox 210 and an extruder gearbox overload protection mechanism 100.

[0072] As shown in Figure 1 、 Figure 3 and Figure 4 , the extruder gearbox overload protection mechanism 100 is arranged in the gearbox 210, and the temperature sensor is arranged in the gearbox 210 to monitor the oil temperature in the gearbox 210. The temperature sensor directly monitors the lubricating oil temperature in the gearbox 210, which can reflect the heating condition of key parts such as gear meshing and bearing operation in real time, thereby issuing an early warning in the early stage of temperature rise anomaly caused by overload.

[0073] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusions, so that a process, method, article or apparatus including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or inherent to such a process, method, article or apparatus. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of other identical elements in the process, method, article or apparatus including the element.

[0074] In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted or combined. In addition, the features described with reference to some examples can be combined in other examples.

[0075] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. An extruder gearbox overload protection mechanism characterized by, The utility model relates to an extruder gearbox overload protection mechanism, comprising: A coupling comprising a locking mechanism and two half couplings, one of which is connected to the proximal end of the main shaft, the other of which is used to connect the output shaft, and the two half couplings are connected through the locking mechanism; A gear assembly arranged at the distal end of the main shaft and having an oil outlet channel extending radially therethrough; A main shaft having an oil inlet channel, which is connected to the locking mechanism at one end and to the oil outlet channel at the other end and is connected to an oil tank through an oil pump; Wherein, when the pressure on the locking mechanism exceeds a threshold value, the locking mechanism is separated from one of the half couplings; The locking mechanism comprises a moving plate, an elastic member and a locking portion, one of the half couplings has an oil cavity in communication with the oil inlet channel, the moving plate is slidably arranged in the oil cavity through the elastic member on one side and is connected to the locking portion on the other side; The other half coupling is provided with a limiting groove corresponding to the locking portion, one end of the locking portion extends into the limiting groove through the half coupling; when the pressure on the moving plate exceeds a threshold value, the locking portion is separated from the limiting groove.

2. An overload protection mechanism for an extruder gear box as claimed in claim 1, wherein, The locking mechanism is multiple and is equidistantly arranged along the circumference of the half coupling; And / or, the locking portion and the half coupling are connected through a sealing structure.

3. An overload protection mechanism for an extruder gear box as claimed in claim 2, wherein, The half coupling provided with the oil cavity is also provided with an intermediate chamber, and a plurality of oil cavities are respectively communicated with the oil inlet channel through the intermediate chamber.

4. An overload protection mechanism for an extruder gear case as defined in claim 1, wherein, The gear assembly comprises a gear body and an oil outlet ring, the gear body is connected to the distal end of the main shaft, and the oil outlet ring is sleeved on the gear body; Wherein, the oil outlet channel extends through the gear body and the oil outlet ring along the radial direction of the gear body.

5. An overload protection mechanism for an extruder gear box as claimed in claim 4, wherein, The oil outlet channel comprises a first oil outlet portion, a second oil outlet portion and a third oil outlet portion, the first oil outlet portion extends through the gear body along the radial direction of the gear body and is communicated with the oil inlet channel, the second oil outlet portion is arranged on at least one contact surface between the gear body and the oil outlet ring along the circumferential direction of the gear assembly, and the third oil outlet portion extends through the oil outlet ring along the radial direction of the oil outlet ring and is communicated with the second oil outlet portion.

6. An overload protection mechanism for an extruder gear box as claimed in claim 5, wherein, The third oil outlet portion is multiple and is equidistantly arranged along the circumference of the oil outlet ring; And / or, the gear body has an annular groove, the oil outlet ring is sleeved in the annular groove, and the diameter of the oil outlet ring is smaller than the diameter of the gear body.

7. An overload protection mechanism for an extruder gear case as defined in claim 1, wherein, The extruder gearbox overload protection mechanism further comprises a water slide ring arranged on the main shaft and communicated with the oil inlet channel; the water slide ring is connected to an oil tank through the oil pump.

8. An overload protection mechanism for an extruder gear box as claimed in claim 7, wherein, The oil inlet channel comprises a first oil inlet portion, a second oil inlet portion and a third oil inlet portion, the first oil inlet portion extends along the axial direction of the main shaft and is connected to the gear assembly and the locking mechanism respectively, the third oil inlet portion is arranged on at least one contact surface between the water slide ring and the main shaft along the circumferential direction of the main shaft and is communicated with the oil inlet port of the water slide ring, and the second oil inlet portion is arranged on the main shaft and connected to the first oil inlet portion and the third oil inlet portion.

9. An extruder gearbox, characterized in that An extruder gearbox overload protection mechanism as claimed in any one of claims 1 to 8, including a temperature sensor, a housing and the extruder gearbox overload protection mechanism is disposed in the housing, the temperature sensor is disposed in the housing for monitoring the oil temperature in the housing.

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