Head-up driving mechanism for pressure bar beam of rotary cutter

Abstract

The utility model relates to a rotary cutter pressure bar beam head-up driving mechanism which is characterized in that the rotary cutter pressure bar beam head-up driving mechanism comprises a rotary cutter body, a pressure bar beam base arranged on the body and a pressure bar beam arranged on the pressure bar beam base, pressure bars are arranged on the first side portion of the pressure bar beam at intervals, and the side, away from the pressure bars, of the pressure bar beam base is rotationally hinged to the body. A head raising driving mechanism used for lifting the first side portion of the pressure bar beam base according to the needed height is installed between the first side portion of the machine body and the first side portion of the pressure bar beam base. The head-up driving mechanism comprises a hydraulic cylinder, an oil pump and an oil storage tank, the free end of a telescopic rod of the hydraulic cylinder is connected with the pressure bar beam base, two working modes of the pressure bar beam base, the pressure bar beam and the pressure bar on the pressure bar beam are met through the head-up driving mechanism, and meanwhile, the structure is adopted, so that during maintenance, the pressure bar beam base and the pressure bar on the pressure bar beam are not damaged. The hydraulic cylinder can be kept stable and reliable, the telescopic rod cannot automatically contract, and the maintenance safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to a lifting driving mechanism for a pressure beam of a rotary cutting machine. Background Art

[0002] The function of a wood peeling machine is to peel a whole piece of wood into veneer. When an existing wood peeling machine is in use, the pressure bar used to form a bevel cutting gap with the cutting blade is fixed to the machine body after debugging. When debris clogs the pressure bar and the cutting blade, etc., the machine needs to be stopped for cleaning, and the pressure bar may even need to be removed from the machine body for cleaning, which affects processing efficiency.

[0003] At present, the Chinese patent "A cardless peeling machine and a cardless integrated peeling machine" publication number CN115091575B has been retrieved. The peeling machine includes a frame seat, on which a double-roller assembly, a knife table assembly, a single-roller assembly and a chuck assembly are arranged; the double-roller assembly includes two double-roller monomers, a double-roller lateral drive assembly and a double-roller rotation drive assembly; the knife table assembly includes a peeling knife and a knife table lateral drive assembly; the single-roller assembly is arranged on the knife table assembly, and the single-roller assembly includes a single-roller body, a single-roller rotation drive assembly, and a single-roller lateral drive assembly; the chuck assembly includes Two chuck bodies, a chuck telescopic device and a chuck rotation drive assembly, the two chuck bodies are located at both ends of the wood core; a plurality of annular cross columns are arranged on the single-roller body and the two double-roller monomers, the two double-roller monomers can be cross-distributed with each other, and the single-roller body and the double-roller monomers can be cross-distributed with each other. Although this patent can overcome the shortcomings of the rotary cutter with chucks and the rotary cutter without chucks, and the remaining amount of the rotary cut wood core is less; but it cannot realize the lifting action of the pressure ruler, it is difficult to clean the debris, and it cannot be lifted to different heights according to the needs of use. Summary of the invention

[0004] In view of the above-mentioned problems, the purpose of the utility model is to propose a lifting drive mechanism for the pressure ruler beam of a rotary cutter. The lifting drive mechanism for the pressure ruler beam of the rotary cutter is reasonably designed and is conducive to lifting the pressure ruler to different heights according to different usage needs.

[0005] The technical solution of the utility model is as follows:

[0006] The utility model discloses a lifting driving mechanism of a pressure ruler beam of a rotary cutting machine, characterized in that it comprises a rotary cutting machine body, a pressure ruler beam base arranged on the body and a pressure ruler beam arranged on the pressure ruler beam base, pressure rulers are arranged at intervals on a first side portion of the pressure ruler beam, a side of the pressure ruler beam base away from the pressure ruler is rotatably hinged on the body, a lifting driving mechanism for lifting the first side portion of the pressure ruler beam base according to a required height is installed between the first side portion of the body and the first side portion of the pressure ruler beam base; the lifting driving mechanism comprises a hydraulic cylinder, an oil pump and an oil storage tank, the free end of the telescopic rod of the hydraulic cylinder is connected to the pressure ruler beam base, the cylinder body of the hydraulic cylinder is connected to the body, the hydraulic oil inlet end of the cylinder body of the hydraulic cylinder is connected to the output end of the oil pump through a first pipeline, a one-way throttle valve is connected in series on the first pipeline, and the input end of the oil pump is connected to the output end of the oil storage tank.

[0007] Preferably, the oil pump is a plunger pump.

[0008] Preferably, the oil pump comprises a first cylinder and a sealing oil cylinder, the free end of the telescopic rod of the first cylinder extends into the open end of the sealing oil cylinder, the inner circumferential wall of the sealing oil cylinder is provided with two annular grooves arranged at intervals, a sealing ring is installed in the annular groove, two sealing ring sealing sleeves are arranged on the outer circumference of the telescopic rod of the first cylinder, an oil inlet hole connected to the outlet end of the oil storage tank is provided on the sealing oil cylinder between the two sealing rings, the oil inlet hole is the input end of the oil pump, an extrusion oil cavity is formed between the inner bottom wall of the sealing oil cylinder and the free end of the telescopic rod of the first cylinder, an oil outlet hole is provided on the sealing oil cylinder at the position of the extrusion oil cavity, the oil outlet hole is the output end of the oil pump.

[0009] Preferably, the telescopic rod of the first cylinder telescopes in the extrusion oil chamber. When the telescopic rod of the first cylinder is extended to the longest, the telescopic rod of the first cylinder compresses the extrusion oil chamber, so that the extrusion oil chamber squeezes and outputs oil to the oil outlet and the first pipeline; when the telescopic rod of the first cylinder is extended to the shortest, the telescopic rod of the first cylinder expands the extrusion oil chamber, and the extrusion oil chamber generates negative pressure, so that the oil storage tank fills oil into the extrusion oil chamber.

[0010] Preferably, the free end of the telescopic rod of the first cylinder has a conical surface, and the cylindrical surface of the telescopic rod of the first cylinder and the conical surface form an intersection line. When the telescopic rod of the first cylinder is extended to the shortest, the intersection line is located between the two sealing rings.

[0011] The working principle of the driving mechanism for the pressure ruler beam of the rotary cutting machine of the utility model is as follows: since the pressure ruler beam base, the pressure ruler beam and the pressure ruler thereon have two working modes, one is the normal working mode and the other is the maintenance mode. In the normal working mode, the one-way throttle valve is in a passage state, that is, the first pipeline is unobstructed. In this working state, if debris blocks the pressure ruler, the oil pump works for a short time (for example, the working time is 1-5 seconds), and the oil pump pumps a small amount of oil from the oil storage tank into the hydraulic cylinder, so that the free end of the telescopic rod of the hydraulic cylinder extends a short distance, and the debris blocked on the pressure ruler can be brought out by the rotating shaft or the gear disc, so as to achieve the effect of quickly cleaning the debris; when maintenance is required or the blockage is serious, the equipment is shut down, and the one-way throttle valve is manually operated to make it It is in a one-way state (the one-way throttle valve becomes a one-way valve), that is, the oil can only be input into the hydraulic cylinder from one side of the oil pump through the first pipeline. In this working state, the oil pump works for a long time (for example, the working time is 10-60 seconds), and the oil pump continuously pumps the oil in the oil storage tank into the hydraulic cylinder. Since the one-way throttle valve becomes a one-way valve at this time, the oil cannot flow in the opposite direction, so that the free end of the telescopic rod of the hydraulic cylinder is extended to the longest. At this time, the relevant components can be inspected or the blocked debris can be cleaned; and when the inspection is completed, the one-way throttle valve is manually operated to put it in a passage state. Due to the gravity of the base of the pressure gauge beam, the gravity of the base of the pressure gauge beam acts on the free end of the telescopic rod of the hydraulic cylinder, so that the oil in the hydraulic cylinder flows back to the oil storage tank through the first pipeline.

[0012] The utility model meets the two working modes of the pressure ruler beam base, the pressure ruler beam and the pressure ruler thereon through the above-mentioned head-up driving mechanism, and adopts the above-mentioned structure at the same time, when being repaired, the hydraulic cylinder can remain stable and reliable, and the telescopic rod will not have the problem of automatic contraction, thereby ensuring the safety of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings;

[0014] Figure 1 It is a three-dimensional diagram of the driving mechanism of the pressure beam of the rotary cutting machine;

[0015] Figure 2 yes Figure 1 sectional view of

[0016] Figure 3 yes Figure 2 A partial view of

[0017] Figure 4 It is a three-dimensional diagram of the connection between the pressure ruler beam and the pressure ruler;

[0018] Figure 5 yes Figure 4 sectional view of

[0019] Figure 6 , 7It is a three-dimensional picture of the pressure ruler;

[0020] Figure 8 It is a three-dimensional diagram of the head-up drive mechanism;

[0021] Fig. 9 This is a sectional stereoscopic diagram of the connection between the cylinder and the oil tank (the telescopic rod of the cylinder is extended to the longest position);

[0022] Fig.10 This is a cross-sectional stereoscopic diagram of the connection between the cylinder and the oil tank (the telescopic rod of the cylinder is in the shortest state);

[0023] Fig.11 It is a cross-sectional view of the connection between the hydraulic cylinder and the one-way throttle valve;

[0024] Fig.12 It is a three-dimensional diagram of the cylinder. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods.

[0026] The rotary cutter turning and pressing ruler mechanism comprises a rotary cutter body 1, a pressing ruler beam base 2 arranged on the body 1, and a pressing ruler beam 3 arranged on the pressing ruler beam base 2. The pressing ruler beam base 2 is fixed to the body 1, and the pressing ruler beam 3 is slidably connected to the pressing ruler beam base 2, that is, the pressing ruler beam 3 can be slidably adjusted and locked in a direction close to or away from the first side of the pressing ruler beam base. The pressing ruler beam 3 can be slidably adjusted and locked in a direction close to or away from the first side of the pressing ruler beam base, thereby meeting the needs of processing wood of different diameters.

[0027] A plurality of pressure bars 4 are arranged at intervals on the first side of the pressure bar beam 3, and the side (second side) of the pressure bar beam base 2 away from the pressure bar 4 is rotatably hinged on the machine body 1, and a head-lifting driving mechanism A is installed between the first side of the machine body 1 and the first side of the pressure bar beam base 2 for lifting the first side of the pressure bar beam base according to the required height.

[0028] The above-mentioned lifting drive mechanism can be a motor-driven screw-nut mechanism, or a hydraulic cylinder or an air cylinder. The motor-driven screw-nut mechanism, or the hydraulic cylinder or the air cylinder can lift the ruler beam base 2, the pressure ruler beam 3 and the pressure ruler 4 to a certain height according to the needs of different tasks, such as lifting a short distance (for example, 1-10 mm) or lifting a long distance (for example, 10-100 mm); the above-mentioned short-distance lifting can be carried out during the peeling work to clear the blockage of debris which is not serious (so that there is no need to stop the machine when any blockage occurs, which causes the problem of low processing efficiency); the above-mentioned long-distance lifting can be used for equipment maintenance or in case of serious blockage.

[0029] In order to improve the service life of the pressure ruler 4, the pressure ruler is in the shape of an elongated strip, and a recessed groove 401 is provided on the surface of one side of the lower part of the pressure ruler and away from the hinged end of the pressure ruler beam base, and a wear-resistant block 402 is fixedly installed in the recessed groove. During the rotary cutting operation, the wood is always in contact with the surface of the pressure ruler. When the wear-resistant block 402 is not used, the surface of the pressure ruler 4 is worn out in a short time, thereby affecting its service life. By installing the wear-resistant block 402, the replacement time can be greatly extended. The pressure ruler 4 can be made of metal materials such as 45 steel, and the wear-resistant block 402 can be made of wear-resistant materials such as high manganese steel and alloy steel.

[0030] In order to achieve the installation and fixation of the wear-resistant block 402, a groove slit 403 is opened at the bottom of the above-mentioned recessed groove, and a through hole 404 penetrating the pressure ruler is opened at the end of the groove. A first bolt groove 405 vertically penetrating the groove is opened at the bottom of the pressure ruler. After locking the bolt in the first bolt groove, it can be used to adjust the width of the groove and the recessed groove, so that the wear-resistant block can be clamped and fixed.

[0031] In the present application, a rotating shaft 5 is installed on the machine body, and a toothed disc 6 with an outer circumference for pressing the surface of the wood is fixedly sleeved at intervals on the rotating shaft 5. The toothed disc 6 rotates synchronously with the rotating shaft 5, and the pressure ruler is arranged between two adjacent toothed discs. A cutting knife 7 is installed on the machine body 1, and a gap 8 for peeling the wood is formed between the cutting knife and the surface of the lower end of the pressure ruler. The gap determines the thickness of the veneer after peeling. Therefore, from a microscopic observation, when the pressure ruler is fixed on the pressure ruler beam, the gap 8 generated between the lower end of each pressure ruler and the cutting knife 7 is slightly different. When the difference exceeds 0.05 mm, it will affect the quality of the peeled veneer. Therefore, the gap needs to be adjusted during the machine commissioning.

[0032] In order to facilitate the adjustment of the gap 8 of each pressure ruler, the pressure ruler beam 3 is provided with a protrusion 301 for supporting the lower part of the pressure ruler (the protrusion 301 is a boss, and each pressure ruler on the pressure ruler beam 3 is correspondingly provided with a boss), and the upper part of the pressure ruler is provided with a groove 406 with a narrowed pressure ruler cross-section (the groove 406 can be provided at any position of the circumference of the pressure ruler, but is preferably provided on the surface close to the protrusion), so that the pressure ruler is easy to deform at the groove position. Under the support of the protrusion 301, when the upper part of the pressure ruler is locked and fixed on the pressure ruler beam 3, the pressure ruler is deformed. By providing the groove 406 with a narrowed pressure ruler cross-section on the upper part of the pressure ruler, it is easier to change the shape of the pressure ruler.

[0033] Specifically, the pressure ruler beam 3 is provided with a positioning track bar 302 along its length direction, and a positioning groove 407 corresponding to the positioning track bar 302 is provided on the pressure ruler above the groove 406, and a screw hole 303 is provided on the positioning track bar. A second bolt groove 408 is provided on the pressure ruler at a position corresponding to the positioning groove, and the first bolt is passed through the second bolt groove and locked with the screw hole on the positioning track bar; the groove on the pressure ruler is located below the second bolt groove, and at least one third bolt groove 409 is provided on the pressure ruler below the groove, and the second bolt is passed through the third bolt groove and locked with the screw hole at that position on the pressure ruler beam, and the bolt passes through the second bolt groove and the third bolt groove from the side away from the hinged end of the pressure ruler beam and is connected with the screw hole.

[0034] When the pressure bar 4 and the pressure bar beam 3 are installed (such as Figure 3 , 5 As shown in the figure, firstly mate the positioning groove 407 of the pressure ruler 4 with the positioning track bar 302 of the pressure ruler beam 3, and initially connect and fix the first bolt through the second bolt recessed groove 408 and the screw hole 303, and then use the second bolt to pass through the third bolt recessed groove 409 and lock with another screw hole of the pressure ruler beam 3. When the second bolt is tightened, the lower part of the pressure ruler 4 is pressed against the protrusion 301, and the lower end of the pressure ruler 4 is tilted outward, the gap 8 is smaller, and vice versa.

[0035] Working principle of the rotary cutting machine's turning and pressing mechanism:

[0036] The first side of the pressure ruler beam base can be lifted by the lifting drive mechanism. Therefore, during the processing, if the pressure ruler and other components are blocked by minor debris, the pressure ruler beam base and the pressure ruler can be lifted a short distance, and the debris blockage will be brought out by the rotating shaft or gear disk, thereby solving the blockage problem. When maintenance is required or there is serious debris blockage, the pressure ruler beam base and the pressure ruler can be lifted a long distance, thereby facilitating the maintenance of the equipment.

[0037] In addition, in addition to the aforementioned structure, the head-lifting drive mechanism A can also be the following structure, which includes a hydraulic cylinder A1, an oil pump A2 and an oil storage tank A3, the free end of the telescopic rod A101 of the hydraulic cylinder A1 is connected to the pressure beam base 2, and the cylinder body A102 of the hydraulic cylinder is connected to the machine body 1. When the hydraulic cylinder is working, the first side portion of the pressure beam base 2 is lifted, and the hydraulic oil inlet end of the hydraulic cylinder body A102 is connected to the output end of the oil pump A2 through the first pipeline A4, and a one-way throttle valve A5 is connected in series on the first pipeline, and the input end of the oil pump is connected to the output end of the oil storage tank.

[0038] During operation, since the pressure bar beam base, the pressure bar beam and the pressure bar thereon have two working modes, one is the normal working mode and the other is the maintenance mode. In the normal working mode, the one-way throttle valve is in the passage state, that is, the first pipeline is unobstructed. In this working state, if debris blocks the pressure bar, the oil pump works for a short time (for example, the working time is 1-5 seconds), and the oil pump pumps a small amount of oil from the oil storage tank into the hydraulic cylinder, so that the free end of the telescopic rod of the hydraulic cylinder extends a short distance, and the debris blocked on the pressure bar can be brought out by the rotating shaft or the gear disc, so as to achieve the effect of quickly cleaning the debris; when maintenance is required or the blockage is serious, the equipment is shut down, and the one-way throttle valve is manually operated to put it in a one-way state (one-way throttle valve). The one-way throttle valve becomes a one-way valve), that is, oil can only be input into the hydraulic cylinder from one side of the oil pump through the first pipeline. In this working state, the oil pump works for a long time (for example, the working time is 10-60 seconds), and the oil pump continuously pumps the oil in the oil storage tank into the hydraulic cylinder. Since the one-way throttle valve becomes a one-way valve at this time, the oil cannot flow in the opposite direction, so that the free end of the telescopic rod of the hydraulic cylinder is extended to the longest, and the relevant components can be inspected or the blocked debris can be cleaned at this time; and when the inspection is completed, the one-way throttle valve is manually operated to put it in a passage state. Due to the gravity of the base of the pressure gauge beam, the gravity of the base of the pressure gauge beam acts on the free end of the telescopic rod of the hydraulic cylinder, so that the oil in the hydraulic cylinder flows back to the oil storage tank through the first pipeline.

[0039] The utility model meets the two working modes of the pressure ruler beam base, the pressure ruler beam and the pressure ruler thereon through the above-mentioned head-up driving mechanism, and adopts the above-mentioned structure at the same time, when being repaired, the hydraulic cylinder can remain stable and reliable, and the telescopic rod will not have the problem of automatic contraction, thereby ensuring the safety of maintenance.

[0040] The one-way throttle valve is a commercially available part, which may be a manual one-way throttle valve of model DVP6 produced by Wuxi Fulide Hydraulic Machinery Co., Ltd.

[0041] The oil pump may be a plunger pump or a peristaltic pump, or may be of the following specific structure.

[0042] The oil pump A2 includes a first cylinder A201 and a sealing oil cylinder A202. The free end of the telescopic rod of the first cylinder A201 extends into the open end of the sealing oil cylinder A202. The inner circumferential wall of the sealing oil cylinder is provided with two annular grooves arranged at intervals. A sealing ring A204 is installed in the annular groove. The two sealing ring sealing sleeves are arranged on the outer periphery of the telescopic rod A205 of the first cylinder. An oil inlet hole A206 connected to the outlet end of the oil storage tank is provided on the sealing oil cylinder between the two sealing rings. The oil inlet hole is the input end of the oil pump. An extrusion oil cavity A207 is formed between the inner bottom wall of the sealing oil cylinder and the free end of the telescopic rod of the first cylinder. An oil outlet hole A208 is provided on the sealing oil cylinder at the position of the extrusion oil cavity. The oil outlet hole is the output end of the oil pump.

[0043] Among them, the telescopic rod of the above-mentioned first cylinder telescopes and retracts in the extrusion oil chamber. When the telescopic rod of the first cylinder is extended to the longest, the telescopic rod of the first cylinder compresses the extrusion oil chamber, so that the extrusion oil chamber squeezes and outputs oil to the oil outlet and the first pipeline; when the telescopic rod of the first cylinder is extended to the shortest, the telescopic rod of the first cylinder expands the extrusion oil chamber, and the extrusion oil chamber generates negative pressure, so that the oil storage tank fills oil into the extrusion oil chamber.

[0044] The first cylinder telescopic rod A205 of the first cylinder A201 of the present application exchanges a small diameter and a long stroke for a large diameter and a short stroke of a hydraulic cylinder, thereby increasing the lifting thrust (since the pressure gauge beam at the upper end is heavy, it cannot be lifted up by a normal air cylinder. This gas-to-hydraulic method is used, firstly to increase the pressure so that the low-thrust cylinder can drive a heavy object by converting the diameter-stroke ratio, and secondly, most factories have air compressors and do not need to purchase additional high-lift hydraulic equipment).

[0045] For the sake of reasonable design, the free end of the telescopic rod of the first cylinder has a conical surface A203, and the cylindrical surface of the telescopic rod of the first cylinder and the conical surface form an intersection line A209. When the telescopic rod of the first cylinder is extended to the shortest, the intersection line is located between the two sealing rings. The setting position of the intersection line A209 is crucial for the suction and extrusion of oil in the extrusion oil chamber.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A lifting drive mechanism for a pressure beam of a rotary cutting machine, characterized in that: The invention comprises a peeling machine body, a pressure ruler beam base arranged on the body and a pressure ruler beam arranged on the pressure ruler beam base, pressure rulers are arranged at intervals on the first side of the pressure ruler beam, a side of the pressure ruler beam base away from the pressure ruler is rotatably hinged on the body, a lifting drive mechanism for lifting the first side of the pressure ruler beam base according to the required height is installed between the first side of the body and the first side of the pressure ruler beam base; the lifting drive mechanism comprises a hydraulic cylinder, an oil pump and an oil storage tank, the free end of the telescopic rod of the hydraulic cylinder is connected to the pressure ruler beam base, the cylinder body of the hydraulic cylinder is connected to the body, the hydraulic oil inlet end of the cylinder body of the hydraulic cylinder is connected to the output end of the oil pump through a first pipeline, a one-way throttle valve is connected in series on the first pipeline, and the input end of the oil pump is connected to the output end of the oil storage tank.

2. The lifting drive mechanism of the pressure beam of the peeling machine according to claim 1, characterized in that: The oil pump is a plunger pump.

3. The lifting driving mechanism of the pressure beam of the peeling machine according to claim 1, characterized in that: The oil pump includes a first cylinder and a sealing oil cylinder, the free end of the telescopic rod of the first cylinder extends into the open end of the sealing oil cylinder, the inner circumferential wall of the sealing oil cylinder is provided with two annular grooves arranged at intervals, a sealing ring is installed in the annular groove, and two sealing ring sealing sleeves are arranged on the outer circumference of the telescopic rod of the first cylinder, an oil inlet hole connected to the outlet end of the oil storage tank is provided on the sealing oil cylinder between the two sealing rings, and the oil inlet hole is the input end of the oil pump, an extrusion oil cavity is formed between the inner bottom wall of the sealing oil cylinder and the free end of the telescopic rod of the first cylinder, an oil outlet hole is provided on the sealing oil cylinder at the position of the extrusion oil cavity, and the oil outlet hole is the output end of the oil pump.

4. The lifting drive mechanism of the pressure beam of the peeling machine according to claim 3, characterized in that: The telescopic rod of the first cylinder telescopes in the extrusion oil chamber. When the telescopic rod of the first cylinder is extended to the longest, the telescopic rod of the first cylinder compresses the extrusion oil chamber, so that the extrusion oil chamber squeezes and outputs oil to the oil outlet and the first pipeline; when the telescopic rod of the first cylinder is extended to the shortest, the telescopic rod of the first cylinder expands the extrusion oil chamber, and the extrusion oil chamber generates negative pressure, so that the oil storage tank fills oil into the extrusion oil chamber.

5. The lifting driving mechanism of the pressure beam of the peeling machine according to claim 4, characterized in that: The free end of the telescopic rod of the first cylinder has a conical surface, and the cylindrical surface of the telescopic rod of the first cylinder and the conical surface form an intersection line. When the telescopic rod of the first cylinder is extended to the shortest, the intersection line is located between the two sealing rings.

Images