Screw conveyor device with removable pin and meat grinder herewith

Abstract

A screw conveyor device (1) for a meat grinder, comprising a screw element (10) which has at a first end (E1) an axially interlocked connection (30) with a pin (20), wherein the connection (30) forms a rotationally fixed positive fit (31) and an annular gap (32) is formed at the outer end of the connection (30), and wherein an axial locking device (40) is provided between the pin (20) and the screw element (10), wherein the axial locking device (40) - is formed either by a threaded connection between the pin (20) and the worm element (10) or by a locking element from the group consisting of dowel pins, grub screws and threaded pins, - or has a fastening element (41) in the annular gap (32), characterized in that a sealing ring (50) is pressed into an installation space (33) formed by the annular gap (32), wherein the installation space (33) is directly adjacent to an end face (11, 21) of the screw element (10) and / or the pin (20).

Description

[0001] The invention relates to a screw conveyor device according to the preamble of claim 1 and a meat grinder according to claim 15.

[0002] Meat grinders are used to grind pieces of varying sizes of a product into particles of a defined size. The product is usually meat intended for human or animal consumption, but increasingly, vegetarian foods are also being processed. Raw materials for confectionery or non-food products from various industries are also ground using a meat grinder.

[0003] A key element of a meat grinder is the auger, which transports the food to be processed to the grinding unit. It is known that a separate pin is fixedly connected at one end to a screw element of the auger. Extending from the connection point with the screw element, the pin has an axially extending support section on which blades are mounted in a rotationally fixed manner and consequently rotate with the screw element. A perforated disc, mounted opposite the blades, can be fixedly supported on the meat grinder housing and may have a central hub through which the pin passes.

[0004] Document DE 26 49 305 C3 discloses the use of a detachable connection between the screw element and the journal to allow for the individual replacement of cutting elements, journal, and screw element. These components are subject to varying degrees of wear. Wear occurs due to the high surface pressure between the hub of the knife and the surfaces of the journal, as well as the relative movements of the two parts during the comminution process. The cutting edges of the knives also wear during the cutting process and must be resharpened regularly. Once a defined wear limit is reached, the knives are replaced with new parts. The screw element is subject to very little wear, but is comparatively expensive to manufacture compared to the knives and journal. Therefore, separate replaceability is desirable.

[0005] The detachable connection described in DE 26 49 305 C3 is a screw connection in which the pin has an external threaded section that is screwed into an internal thread in the worm gear element. A disadvantage of this design is that the connection becomes difficult or impossible to loosen after prolonged use. Applying high torques when loosening the screw connection can damage the components. Furthermore, with a screwed-in cutter pin, reverse rotation of the worm gear is either impossible or severely limited.

[0006] Another disadvantage is the gap at the connection point between the shaft and the screw element. While this gap can be minimized by appropriately selecting tolerances, it still provides a habitat for microorganisms. From a microbiological perspective, metallic contact surfaces are generally considered leaky. The typical products processed by a meat grinder naturally contain microorganisms, which, in combination with material residues, find a suitable habitat in the smallest cracks or spaces between contact surfaces. The massive proliferation of microorganisms, which can occur rapidly under favorable conditions, poses a risk to the processed product and, in particular, to the consumer. Pathogenic germs are highly undesirable in food processing.

[0007] Two further methods for fastening and sealing a pin to a screw element are known from DE 20 2020 105 051 U1 and DE 20 2020 105 052 U1. DE 20 2020 105 051 U1 describes a pin that is positively engaged in a screw element. In an annular gap between the screw element and the pin, a retaining ring with an external thread is screwed into an internal thread in the screw element. There, it presses against a shoulder of the pin and holds it axially in the screw element. Behind the thread, inside the annular gap, are an inner and an outer O-shaped sealing ring, which together create a seal between the retaining ring and the pin, and a seal between the retaining ring and the screw element. However, microorganisms can colonize the thread. In addition, cavities for receiving an assembly tool are formed on the outer end face of the retaining ring.Cavities with such a small ratio between diameter and depth are unhygienic and provoke the adhesion of product residues, thus creating undesirable habitats for microorganisms.

[0008] Due to the high forces during the comminution process, the pin is also subject to elastic deformations relative to the screw element, manifesting as micro-movements in the radial direction as well as torsional movements. This can cause the screw connection of the retaining ring to loosen. The retaining ring and the sealing rings are also subject to these relative movements and can barely withstand them. Furthermore, the relatively small cross-sections of the sealing rings must absorb these movements and are therefore subject to wear.

[0009] DE 20 2020 105 052 U1 describes a slightly differently designed mounting ring with an externally arranged flange. The flange has notches around its circumference to which a tool can be attached. At these points, and also at the transition to the pin, right-angled internal corners are formed during assembly, which are difficult to clean. Microorganisms can colonize these corners and the mounting ring itself, extending to the sealing rings. Another disadvantage of this design is that the mounting ring protrudes beyond the end face of the screw element. However, to achieve a high-quality comminution result, the distance between the end face of the screw element and the blade and perforated disc positioned in front of it must be kept as small as possible.

[0010] German patent DE 20 2021 100 142 U1 discloses a retaining ring with a flange that is inserted into an annular gap between a shaft journal and a screw conveyor. The retaining ring and the screw conveyor lock together by means of corresponding bayonet fittings when rotated. To allow rotation, the retaining ring has end faces with tool receptacles in the form of two opposing recesses. In this way, the retaining ring secures a shoulder of the shaft journal in the screw conveyor. This results in an internal sealing surface between the screw conveyor and the retaining ring.

[0011] Furthermore, DE 20 2020 106 351 U1 discloses a shaft journal which is secured in an opening of a screw conveyor by means of a screw-in fixing ring. This fixing ring also has end-face tool receptacles in the form of two opposing recesses. The gap between the screw conveyor and the shaft journal is sealed by two sealing rings located further inside the screw conveyor, extending from the fixing ring.

[0012] German patent DE 10 2005 032 678 A1 describes a filling machine with a screw conveyor. The object of this invention is to create a process-reliable connection between a pin and the screw element without providing a breeding ground for microorganisms. A further object is the ability to replace the pin and subsequently restore the process-reliable connection without the use of special tools. If possible, the replacement of the pin should be simplified compared to known solutions so that it can be carried out worldwide by a qualified person using standard tools typically found in any workshop and without requiring specialized knowledge.

[0013] The main features of the invention are specified in the characterizing part of claim 1 and in claim 15. Embodiments are the subject of claims 2 to 14.

[0014] The invention relates to a screw conveyor for a meat grinder, comprising a screw element that has an axially interlocked connection with a pin at a first end, wherein the connection forms a rotationally fixed positive fit and an annular gap is formed at the outer end of the connection, wherein an axial locking device is provided between the pin and the screw element. The axial locking device is formed a) either by a threaded connection between the pin and the screw element or by a locking element from the group consisting of dowel pins, set screws, and threaded pins, or b) comprises a fastening element in the annular gap. A sealing ring is pressed into an installation space formed by the annular gap, wherein the installation space is directly adjacent to an end face of the screw element and / or the pin.

[0015] The sealing ring seals the annular gap, particularly on the outer surface. This prevents microorganisms from penetrating the seal. Because the pressed-in sealing ring is not located behind a retaining screw ring, it can also have a greater material thickness than internal O-rings. The greater radial material thickness of the sealing body, compared to known solutions, is able to permanently compensate for micro-movements in axial and radial directions, as well as torsional movements of the cutter shaft, without wear, thanks to the elasticity of the sealing material. The worm element can be made, for example, of stainless steel casting, 3D printing, a welded construction of stainless steel parts, or plastic. The shaft is preferably made of steel, in particular stainless steel or heat-treated steel.

[0016] Furthermore, it is preferable that the sealing ring sits on a section of the journal that has no notch. This prevents any notch effect on the journal, ensuring that the sealing ring fully engages it at the critical point of entry into the worm gear. The axial locking should not be formed by the sealing ring itself. This prevents any holding forces from acting on the sealing ring, which could impair its sealing performance.

[0017] In an optional design, the sealing ring forms a flush surface with the end face(s) at its rear end. This allows for easy visual inspection to verify correct installation and sealing performance both after assembly and throughout service life. Furthermore, there are no internal corners at the transition where microorganisms could accumulate. Instead, the sealed gap extends right up to the flush surface. The entire sealing area is thus free of cavities or edges, preventing microorganisms from growing and ensuring residue-free cleaning. Another reason for a flush finish is to minimize the distance between the screw element and an optional perforated disc or blade positioned in front of it.

[0018] In a particular embodiment, the sealing ring is arranged on a collar, which in particular forms part of the flush surface. The collar can, in particular, be part of the pin. It contributes to providing a smooth surface for cleaning, especially in the area of ​​the transition between the parts and the sealing ring. Away from the transition point, the collar can then transition into other surface orientations with radii, preferably larger than 3 mm, that are easy to clean.

[0019] Preferably, the sealing ring is rotationally symmetrical. This shape is cost-effective to manufacture and allows for simple and reliable assembly. However, a non-rotationally symmetrical shape is conceivable and can be produced with comparable properties to the rotationally symmetrical version, at least for special cases.

[0020] In a specific embodiment, the sealing ring features a detent geometry on its inner and / or outer surface that engages with a detent geometry in the annular gap. This ensures that the sealing ring is reliably positioned in the intended location, even under load. The detent geometry of the sealing ring may include at least one barb that engages with a detent recess formed by the detent geometry in the annular gap. This allows for easy assembly with tactile feedback confirming correct seating. The detent geometry in the annular gap can be located on the pin and / or the worm gear element.

[0021] Optionally, the sealing ring can be provided with a groove at its front end, which—if applicable—is formed particularly in the area of ​​the optional detent geometry. This makes it easier to radially compress the sealing ring at its front end and thus insert it into the installation space. Optionally, the sealing ring can be elastic or made of an elastic material, such as a plastic or rubber. Furthermore, a design is available in which the sealing ring is compressed during insertion and at least partially relaxes in its final position.

[0022] Furthermore, it is advantageous if the radial cross-sectional area of ​​the sealing ring is wider than the radial width of the installation space at least at one point, preferably at the rear end. This ensures a sealing effect right up to the end faces.

[0023] According to one embodiment, the sealing ring comprises a sealing body and a reinforcing ring. The reinforcing ring is made of a harder material than the sealing body and is inserted and / or pressed into a groove formed in the sealing body at the rear end of the sealing ring. The reinforcing ring can thus support a softer material from the inside. Furthermore, by pressing the sealing ring into the installation space in stages—first the sealing body and then the reinforcing ring—it can achieve a higher contact force on the sealing surfaces and lock any detent geometries.

[0024] The reinforcing ring should form a flush surface with the sealing body. This ensures a hygienic surface. Furthermore, the sealing body should be made of an elastic material, such as plastic or rubber, and the reinforcing ring of a more rigid material, such as steel, stainless steel, or a hard plastic. Finally, the reinforcing ring can have a locking mechanism on its inner and / or outer surface, such as a barb that engages in a corresponding groove in the sealing body. This secures the reinforcing ring in place. To remove it, one can, for example, insert a screwdriver into the sealing body and pry out the reinforcing ring. Ideally, the sealing ring should only be removable by damaging it, e.g., by cutting it.This is achieved by drilling a hole in the sealing ring and then using a tool to pry or lever the ring from behind through the hole. This forces the replacement of the sealing ring during maintenance. Unlike a leaking pipe seal, a microbial hotspot is not readily apparent in this type of seal.

[0025] In one variant of the screw conveyor device according to the invention, the axial locking is provided by a threaded connection between the pin and the screw element or by a locking element from the group consisting of cylindrical pins, set screws and threaded pins. The latter should then project through the screw element into the pin or project completely through the pin.

[0026] In a variant of the invention, the axial retaining element has a fastening element located in the annular gap. This places the axial retaining element in a hygienically safe area behind the seal. The fastening element is preferably a retaining ring. Such a ring can also be used in an annular gap. Preferably, the fastening element or retaining ring is a grooved ring, an internal retaining ring (also known as a Seeger ring), a snap ring, or a spiral ring, wherein a retaining ring groove is formed in the annular gap, particularly preferably spaced apart from the installation space of the sealing ring. A grooved ring or an internal retaining ring requires little space, forms an almost 360-degree stop, and retaining ring pliers for its installation are part of any well-equipped workshop. Alternatively, installation can be carried out with standard needle-nose pliers.The annular gap should serve in particular as mounting space for the fastening element.

[0027] In a more detailed design of the screw conveyor device, the sealing ring is positioned at a distance from the fastening element. Any load-bearing movements of the fastening element thus do not directly affect the sealing ring, which consequently seals more reliably.

[0028] According to a particular embodiment of the screw conveyor, at least one knife is arranged on the journal, preferably positively locked in place. With such combinations of screw element, journal, and knife, the advantages of the removable journal are particularly evident because the knife, journal, and screw element have different maintenance and / or replacement cycles. The journal can form a knife journal on which the knife is mounted with a knife hub.

[0029] A further development of the screw conveyor device can involve positioning the knife opposite a perforated disc. The material being processed, conveyed by the screw element, is then cut by the knife and finally pressed through the perforated disc. The journal is preferably rotatably mounted in a hub of the perforated disc, which is optionally mounted in a rotationally fixed manner. This positions the knife very closely between the screw element and the perforated disc, minimizing wear while ensuring a high-quality cutting result.

[0030] A further preferred embodiment is that the connection is designed such that the pin projects into the worm element. This allows the winding of the worm element to extend particularly close to the blade.

[0031] Furthermore, a design is possible in which the positive locking is achieved through a multi-sided geometry, a polygon connection, a splined connection, or a screw connection. Screw connections are easy to manufacture and particularly suitable for less demanding applications. Multi-sided geometries and polygon connections can transmit greater forces at a slightly higher cost, and splined connections are suitable for particularly high transmission forces. The multi-sided geometry could, for example, be a square.

[0032] The journal optionally has a shoulder or collar that abuts axially against the screw element. This holds the journal and screw element in a defined position relative to each other. The shoulder is preferably located in the annular gap, and particularly preferably deeper than the installation space.

[0033] The snail element should have a core around which a snail whorl winds. The annular gap is then preferably formed adjacent to the core.

[0034] The invention further relates to a meat grinder with a screw conveyor device as described above and below, wherein the screw conveyor device is arranged in a screw housing and driven by a conveying drive, wherein a receiving hopper opens into the screw housing, and wherein the screw conveyor device is configured to convey material to be processed from the receiving hopper to a rotating knife. Optionally, the knife is the one described above, which is arranged to rotate on the shaft.

[0035] The meat grinder can be easily and inexpensively maintained thanks to its removable shaft, as the shaft and auger element can be replaced individually. Furthermore, cleaning is easy, and the connection between the shaft and auger element does not provide a breeding ground for microorganisms. This ensures hygienic food processing.

[0036] Further features, details and advantages of the invention will become apparent from the wording of the claims and from the following description of exemplary embodiments with reference to the drawings. The drawings show: Fig. 1 a longitudinal section through an assembled screw conveyor device with a pressed-in sealing ring; Fig. 2 a perspective view of the assembled screw conveyor device according to Fig. 1; Fig. 3 an exploded view of the screw conveyor device according to the Fig. 1 and Fig. 2; Fig. 4 a longitudinal section through a mounted screw conveyor device with a pressed-in but slightly differently designed sealing ring; Fig. 5 an exploded view of the screw conveyor device according to the Fig. 4; and Fig. 6 an exploded view of a screw conveyor device with knife and perforated disc.

[0037] Fig. Figure 1 shows a longitudinal section through an assembled screw conveyor 1 for a meat grinder. This screw conveyor 1 has a screw element 10 with a screw core 12 and a screw flight 13 that winds around the screw core 12. The screw element 10 can be made, for example, of cast stainless steel, 3D printed, a welded construction of stainless steel parts, or plastic.

[0038] At a first end E1 of the screw element 10, here in particular of the screw core 12, an axially interlocking connection 30 with a pin 20 is formed, wherein the pin 20 projects into the screw element 10, namely its screw core 12. The pin 20 is preferably made of steel, in particular stainless steel, or heat-treated steel.

[0039] The connection 30 forms a rotationally fixed positive connection 31. The latter can be formed by a multi-sided geometry, e.g., a square, a polygon connection, a splined connection, or a screw connection. This lies completely inside the connection 30 or inside the worm element 10.

[0040] Additionally, an axial retaining element 40 is formed between the pin 20 and the worm element 10. For this purpose, the pin 20 has a shoulder or collar 26 that abuts axially against the worm element 10. On the opposite side, the shoulder or collar 26 is secured against axial disengagement by a fastening element 41. The fastening element 41 is a retaining ring, in particular an internal retaining ring, which sits in a retaining ring groove 42 in the wall of the worm element 10.

[0041] Starting from the shoulder or collar 26 to the outer end of the connection 30, an annular gap 32 is formed between the pin 20 and the worm element 10. The retaining ring groove 42 is also formed in this annular gap 32, and the annular gap 32 serves as an assembly space for the fastening element 41 or the inner retaining ring.

[0042] Furthermore, the annular gap 32 forms an installation space 33 for a rotationally symmetrical sealing ring 50. The sealing ring 50 is pressed into the installation space 33 and seals the annular gap 32. The installation space 33 borders directly on the end faces 11, 21 of the worm element 10 and the pin 20. It can be seen that the sealing ring 50 forms a flush surface A with the end faces 11, 21 at its rear end 54. Specifically, the sealing ring 50 is arranged on a collar 28 of the pin 20, which forms part of the flush surface A, namely the end face 21 of the pin 20.

[0043] The sealing ring 50 has a detent geometry 55 on its inner surface 51 and outer surface 52, which engages in a detent geometry 34 in the annular gap 32. The detent geometry 55 of the sealing ring 50 is specifically formed by barbs that engage in a detent recess formed by the detent geometry 34 in the annular gap 32. The detent geometry 34 in the annular gap 32 includes, on the one hand, partial geometries 29 on the pin 20 and, on the other hand, partial geometries 14 on the worm element 11, into which the sealing ring 50 engages.

[0044] At its front end 53, the sealing ring 50 has a groove 57, which is located particularly in the area of ​​the detent geometry 55, allowing the detent geometry 55 of the sealing ring 50 to spring slightly inwards during assembly. The sealing ring 50 is elastically designed or consists entirely of an elastic material such as plastic or rubber.

[0045] During the pressing process, the sealing ring 50 is compressed and then partially relaxes into the illustrated final position. The sealing ring 50 preferably remains spaced apart from the fastening element 41.

[0046] Fig. Figure 2 shows a perspective view of the assembled screw conveyor device 1 after Fig. 1 and Fig. 3 an exploded view of the screw conveyor device according to the Fig. 1 and Fig. 2. Same reference numbers in the Fig. 1, Fig. 2 and Fig. 3 therefore concern identical components, which is why regarding the Fig. 2 and Fig. 3 on the description of the Fig. 1 is referred to.

[0047] The embodiment according to the Fig. 4 and Fig. 5 corresponds, with the exception of the differences of the sealing ring 50 specified below, to that according to the Fig. 1, Fig. 2 and Fig. 3, which is why identical reference numbers refer to identical parts and refer to the description of the Fig. Reference is made to 1 to 3. Contrary to the design of the sealing ring 50 of the Fig. 1 to 3, the sealing ring indicates according to the Fig. 4 and Fig. 5 no groove (57) at the front end 53. However, this would be possible as an option.

[0048] Furthermore, the sealing ring 50 has Fig. 4 and Fig. 5 contrary to the execution of the Fig. 1 to 3 a rear groove 60 at the rear end 54 of the sealing ring 50. The sealing ring 50 consists in particular of a sealing body 58 and a reinforcing ring 59, wherein the sealing body 58 forms the rear groove 60, and the reinforcing ring 59 is pressed into the groove 60. The reinforcing ring 59 is made of a stronger material, e.g., steel or stainless steel, than the sealing body 58 (e.g., plastic or rubber) and presses it from the inside against the worm element 10 and also in the opposite direction against the pin 20. This further compresses the sealing body 58 in the radial direction, increases the contact pressure on the walls of the installation space 33 or of the worm element 10 and the pin 20, and thus improves the sealing effect.

[0049] Fig. Figure 6 shows a final exploded view of a screw conveyor device 1, which, as in the Fig. The assembly can be configured with 1 to 5 elements and additionally includes a knife 22 and a perforated disc 25. During assembly, the knife is positively engaged with a knife hub 24 onto a knife pin 23, which is formed by the pin 20. The knife 22 then rotates at the same speed as the worm element 10. Specifically, it is a cutter wheel or cutter disc with several, in this case, four cutting edges distributed around its circumference.

[0050] The knife 22 is arranged directly opposite the perforated disc 25, with the pin 20 being rotatably mounted in a hub 27 of the perforated disc 25.

[0051] The invention is not limited to one of the embodiments described above, but can be modified in many ways.

[0052] For example, the axial locking device 40 can be formed by a threaded connection between the pin 20 and the worm element 10 or by a locking element from the group of cylindrical pins, grub screws and threaded pins.

[0053] The sealing ring 50 or the sealing body 58 and the reinforcing ring can each be pressed into the installation space using a mounting sleeve.

[0054] Removing the sealing ring 50, particularly for replacing the pin 20, can be achieved, for example, by drilling a hole in the sealing ring 50 to provide a point for a removal tool. Removal is then accomplished by prying it out. This can be done using common tools such as a screwdriver. This also ensures that a new sealing ring is always used when replacing the pin.

[0055] Furthermore, the illustrated screw conveyor devices 1 can each be part of a meat grinder. In this case, the screw conveyor device 1 should be arranged in a screw housing and driven by a conveying drive, wherein a receiving hopper opens into the screw housing, and wherein the screw conveyor device 1 is designed to convey material to be processed from the receiving hopper to a rotating knife 22, wherein the knife 22 is one such as [reference to relevant document]. Fig. 5 can trade. Reference symbol list 1 screw conveyor device 10 snail element 11 End face of the worm element 12 snail kernels 13 snail turns 14 Partial geometry (of the grid geometry on the screw element) 20 cones 21 End face of the pin 22 knives 23 knife pins 24 knife hub 25 perforated disc 26 collars 27 Hub (of the perforated disc) 28 Federal 29 Partial geometry (of the locking geometry on the pin) 30 connection 31 (rotationally stable) positive locking 32 annular gap 33 Installation space 34 Raster geometry (in the annular gap) 40 Axial locking 41 Fastening element 42 Retaining ring groove 50 sealing rings 51 Inside (of the sealing ring) 52 Outer side (of the sealing ring) 53 front end (of the sealing ring) 54 rear end (of the sealing ring) 55 Detent geometry (of the sealing ring) 57 (front) groove 58 sealing bodies 59 Reinforcement ring 60 (rear) groove A surface E1 first end (of the worm element)

Claims

[1] Conveyor screw device (1) for a meat grinder, comprising a screw element (10) having at a first end (E1) an axially interlocked connection (30) with a pin (20), wherein the connection (30) forms a rotationally fixed positive fit (31) and an annular gap (32) is formed at the outer end of the connection (30), and wherein an axial retaining device (40) is provided between the pin (20) and the screw element (10), wherein the axial retaining device (40) - is formed either by a threaded connection between the pin (20) and the worm element (10) or by a locking element from the group consisting of dowel pins, grub screws and threaded pins, - or has a fastening element (41) in the annular gap (32), characterized by, that a sealing ring (50) is pressed into an installation space (33) formed by the annular gap (32), wherein the installation space (33) is directly adjacent to an end face (11, 21) of the screw element (10) and / or the pin (20). [2] Screw conveyor device (1) according to claim 1, characterized by , that the sealing ring (50) forms a flush surface (A) with the end face(s) (11, 21) at its rear end (54). [3] Screw conveyor device (1) according to one of claims 1 or 2, characterized by , that the sealing ring (50) is arranged on a collar (28). [4] Screw conveyor device (1) according to one of the preceding claims, characterized by , that the sealing ring (50) has a detent geometry (55) on its inner side (51) and / or outer side (52) which engages in a detent geometry (34) in the annular gap (32). [5] Screw conveyor device (1) according to one of the preceding claims, characterized bythat the sealing ring (50) has a groove (57) at its front end (53). [6] Screw conveyor device (1) according to one of the preceding claims, characterized by , that the sealing ring (50) has a sealing body (58) and a reinforcing ring (59), wherein the reinforcing ring (59) is made of a stronger material than the sealing body (58) and is inserted and / or pressed into a groove (60) which is formed at the rear end (54) of the sealing ring (50) in the sealing body (58). [7] Screw conveyor device (1) according to one of the preceding claims, characterized by that the axial locking device (40) is not formed by the sealing ring (50). [8] Screw conveyor device (1) according to one of the preceding claims, characterized by , that the pressed-in sealing ring (50) seals the annular gap (32) directly on the outside. [9] Screw conveyor device (1) according to one of the preceding claims, characterized by, that the fastening element (41) is a retaining ring. [10] Screw conveyor device (1) according to one of the preceding claims, characterized by , that the sealing ring (50) is arranged spaced apart from the fastening element (40). [11] Screw conveyor device (1) according to one of the preceding claims, characterized by , that at least one knife (22) is arranged on the pin (20). [12] Screw conveyor device (1) according to one of claims 10 or 11, characterized by , that the knife (22) is arranged opposite a perforated disc (25). [13] Screw conveyor device (1) according to one of the preceding claims, characterized by , that the connection (30) is designed such that the pin (20) projects into the worm element (10). [14] Screw conveyor device (1) according to one of the preceding claims, characterized by, that the positive locking (31) is formed by a polygonal geometry, a polygon connection, a multi-tooth connection or a screw connection. [15] Meat grinder with a screw conveyor device (1) according to one of claims 1 to 14, wherein the screw conveyor device (1) is arranged in a screw housing and is driven by a conveying drive, wherein a receiving hopper opens into the screw housing, and wherein the screw conveyor device (1) is designed to convey material to be processed from the receiving hopper to a rotating knife (22).

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